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  in this area
     A calculation of absorption coefficient and requirements of soil elements for the growing of litchi shows that Ca,K,Mg,Mn,P,Zn,Cu,B,Fe and REE are the specific nutrient elements in this area, and that nutrient elements needed for litchi production are P,Mg,Mo,Cu,Zn,K.
     通过计算荔枝对土壤营养元素的吸收率及荔枝生长与结果期对营养元素的需求,查明本区荔枝生长的特征营养元素为Ca、K、Mg、Mn、P、Zn、Cu、B、Fe和REE。
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     Synthesizing the sedimentary facies, sand body and water-oil-gas distribution law and the oil layer employment anaylysis, thembrsof20, 10+11, 13 + 14, 18, 23, 27, 28, 29, 33, 39 are the main potential oil mbrs of Gaotaizi Oil Layer in this area.
     综合沉积相、砂体、地层结构和油气水分布规律,以及目前油层动用情况分析,认为20层、10+11层、13+14层、18层、23层、27层、28层、29层、33层、39层应是本区高台子的主力潜力层。
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     Oedaleus infernalis Saussure is the dominant species in this area, which occupies 20% in total.
     黄胫小车蝗Oedaleus infernalis Saussure为本区蝗虫优势种,占总数量的20.2%;
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     Estimate nutrients status in this area, the result showed that, there is surplus 21.47- 32.48% of fertilizer N and 44.54-74.56% of fertilizer P. K has 2.45-6.29 kg/hm2·a to the badlack of fertilizer K. Therefore, it should stabilize N 、 K fertilization and decrease Pfertilization.
     对本区的养分状况进行评价的结果表明,本区土壤中 N 每年盈余 21.47-32.48%,P盈余 44.54-74.56%,不施钾肥钾素亏缺 2.45-6.29kg/hm2,所以在肥料用量上,应适当控N、减 P、增 K。
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     By testing and analyzing the fluid inclusion of ores in this area, we find that the fluid in this area mainly consists of NaCl-H2O binary system following NaCl-H2O-CaCl2 ternary system, its homogenization temperature is 90 ~ 220 , which belongs to low temperature;
     通对该区矿石中流体包裹体的测试和分析,发现本区流体以NaCl-H_2O二元体系为主,其次为NaCl-H_2O-CaCl_2三元体系,均一温度主要为90~220℃,属于低温范畴;
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  in this region
     The metallogenic elements in this region are mainly As,Au,Cd,Hg,Ni,Sb,Ag,Cr,Pb,Sn,W,Zn and Cu.
     本区主要成矿元素为As、Au、Cd、Hg、Ni、Sb、Ag、Cr、Pb、Sn、W、Zn、Cu;
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     The Al 2 O 3 /TiO 2 ratios (53.78to413.94)indicate that the strongly peraluminous granites in this region might be a transitional type between the high-temperature type and the high-pressure type.
     Al2O3/TiO2比值(53.78~413.94)表明,本区的强过铝质花岗岩为高温类型和高压类型之间的一种过渡类型。
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     It is interesting to note that the hypo-centers of several major earthquakes in this region, e.g. the Sanhe-Pinggu earthquake (1679, M = 8), the Shacheng earthquake (1730, M=63/4 and the Tangshan earth-quake (1976, M = 7.8) are all located very close to this boundary of these P-velocity variation zones.
     而且,本区的几次强震:三河—平谷地震(1679年,M=8)、沙城地震(1730年,M=6 3/4)和唐山地震(1976年,M=7.8)的震源正好在这些速度差异带的边界附近。
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     The regetation in this region consists of 6 types, 14 formations, 21 associations and the zonal vegetation is Red pine theropencedrymion.
     本区植被包括6个植被型,14个群系,21个群丛,地带性植被为红松针阔混交林。
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     Moreover, inherited zircon ages (581~2492 Ma) in this pluton provide evidence for the exiting of an early Precambrian crystalline basement and multistage evolution of crust in this region.
     此外,获得多组继承/捕虏锆石年龄值(581~2492Ma),为本区存在早前寒武纪变质结晶基底及华南陆壳具多阶段生长演化特征提供了佐证。
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  study area
     The results showed:There are 784 seed vine species,belonging to 159 genera and 60 families,which account for 11.1%,10.8% and 29.7% of the whole seed plant flora in this study area,respectively.
     结果表明:研究区藤本种子植物60科159属784种(含变种),分别占本区种子植物的29.7%、10.8%和11.1%;
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     On calculation,the cumulative horizontal extension amount of the study area in the Cenozoic is about 2.5 to 3.5 km,reflecting a situation of lateral extension of the area.
     据计算,本区新生代累计水平伸展量约25~35km,反映出本区横向扩展的势态。
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     The funnels are the main karst landform in this area,the average area of them are(9?812)? m~2,the total area is(461?179)? m~2 which is 18% of the study area,the average main axis is 120?
     漏斗是本区发育的主要岩溶地貌,它们的平均面积为9 812 m2,总面积达461 179 m2,占研究区面积的18%,长轴平均长120 m,发育密度为18.1个/m2。
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     According to reinforcement principle adopted in the study area, the application of anchor spurted technology is mainly researched in the area, the stress and the strain change characteristic in slope are simulated and analyzed, the role of anchor to
     根据研究区边坡采用的支护原则,主要对锚固技术在本区的应用进行了研究,对锚固方法在本区边坡中应用时,边坡应力、应变的变化特征作了模拟分析,并分析了不同锚杆长度支护时对边坡稳定的作用和它的加固效果,对锚杆长度作出最优选择,为研究区其他边坡的施工、支护方案的选择和同类边坡工程提供借鉴。
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     Three Devonian formations, namely Middle Devonian Gudaoling (D_2g), Upper Devonian Nanyangshan (D_3n) and Xinghongpu (D_3x), acted as the major hosting sequences of gold deposits in the study area, and some gold deposits were also hosted by the Yuanjiagou Formation (C_1y) of Lower Carboniferous age.
     本区含矿地层主要为中泥盆统古道岭组(D2g)、上泥盆统南羊山组(D3n)、星红铺组(D3x)和下石碳统袁家沟组(C1y)。
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     /m2; while the total average biomass is 60.01g/m2,the highest in November,102.99 g/m2,the lowest in February,11.87 g/m2.Meanwhile,the density and biomass are evidently different within four seasons.
     总平均生物量为60.01g/m2,11月最高,为102.99g/m2,2月最低,仅为11.87g/m2。 本区大型底栖动物的栖息密度和生物量有明显的季节变化。
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     Moreover,the molecular index(nC-23/nC+24:0.631—0.950) of alkane biomarkers showed that the low mature hydrocarbon was mainly from mixed sources.
     同时发现烃类生物标志物的分子组合指数(轻重烃比值nC2-3/nC2+4)为0.631—0.950,标志本区低成熟烃母质主要来源于混合源。
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     The results show that the granulites belong to typical low-pressure granulites formed in an environment of high-temperature and low-pressure (low p/T), with peak temperature being 824±15℃ and corresponding pressure lower than 0.5 GPa. The granulites were cooled during late retrograde reaction which terminated at the temperature of 705℃, with the corresponding pressure near the peak.
     结果表明,本区麻粒岩形成于高温低压(低p/T)环境,属于典型的低压麻粒岩,其峰期变质温度为824±15℃,压力小于0.5GPa,晚期岩石发生了退变冷却,终止温度为705℃左右,压力与峰期时的压力相近;
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     Over 80% landslide in the area distribute in the elevation of 100~400m above sea level where human being activities frequency.
     本区80%以上的滑坡分布在海拔400~100m——人类活动最强烈的高程范围。
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     Tourism development can be done by making use of the local cultural advantage. Limited development of hydroelectricity conduces to the coordination of ecological protection and sustainable development. The coordination of the relationships among hydroelectricity,migrants and the protection of national culture conduce to the promotion of economy and social harmonious development.
     岷江上游地区地理位置特殊,自然资源富足,历史文化内涵丰富,我们可以充分利用其比较优势来发展本地区经济,继续发挥传统的交通枢纽功能,利用本区文化优势,做好旅游开发,限制开发水电,协调生态环保与可持续发展,水电开发、移民与民族文化保护的关系,以促进经济与社会协调发展。
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  in this area
Less litter and slower decay rate in pure Chinese fir plantation were the crucial factors leading to the decrease of soil microbial biomass and nutrient pool in this area.
      
The growth of mosses has never been studied in this area and the variables indicating their growth in the subalpine forest ecosystems still needs investigation.
      
We focus our attention on the methods recently developed in this area.
      
However, there are many problems to be solved in this area, especially for closed free-form surface modeling.
      
The soil and water erosions in this area continue to be responsible for many environmental problems in northern China because of its fragility and long disturbance history.
      
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  in this region
In order to find the effect of soil microbial biomass under different vegetation restoration models in this region, six trial sites located in Zhifanggou watershed were selected in this study.
      
As no male sterile genes have been reported in this region, ms157 could be a novel gene related to fertility.
      
In this paper, we used coarse resolution remote sensing data to identify the vegetation types in East China and developed a map of the spatial distribution of vegetation types in this region.
      
In all patients suffering from various forms of myeloid and lymphoid leukemia, hypermethylation of CpG sequences was observed in this region of the calcitonin gene.
      
A promoter region was predicted using homologous blast and cloned for further study, and possible transcription factors were analyzed in this region.
      
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  study area
Results showed that topographic characteristics and disturbance pattern have much more impacts on the distribution of landscape elements than do horizontal geographical position in the study area.
      
The whole study area was divided into the wetland zone, the ecotone and the arid grassland zone in terms of habitat characteristics and vegetation types.
      
Habitat use within the study area was non-random, while habitats within home ranges were randomly used.
      
In this study, we selected the hill and gully area of Loess Plateau, Inner Mongolia, China, as our study area.
      
The coastal low saline species was the dominant ecotype in the study area, and the dominant species were Labidocera euchaeta, Acartia pacifica, Acrocalanus gibber, Pseudeuphausia sinica, and Sagitta bedoti among others.
      
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A.The Soils Since the goological formation of this mountainous area is quite uniform,a vertical distribution of soils is obviously observed. At the top of the mountain with an elevation of 8,500 feet,the podzolic soil is found. The process of podzolization is clearly shown by the translocation of clays,organic matter, and active aluminum from an upper to lower layer.The gray brown podzolic soil is distributed in areas ranging from 7,000 to 8,500 feet in elevation.It is developed under forest and has a...

A.The Soils Since the goological formation of this mountainous area is quite uniform,a vertical distribution of soils is obviously observed. At the top of the mountain with an elevation of 8,500 feet,the podzolic soil is found. The process of podzolization is clearly shown by the translocation of clays,organic matter, and active aluminum from an upper to lower layer.The gray brown podzolic soil is distributed in areas ranging from 7,000 to 8,500 feet in elevation.It is developed under forest and has a surface covering of leaf litter and a surface soil with high content of organic matter.In places at an elevatin from 3,900 to 7,000 feet the yellow podzolic soil is dominant.At an elevation below 3,000 foot the red podzolic soil and the sketetal soil are fonnd. The analytical data of the soils of this area may be summarized as follows: 1.pH values of the soils:In the whole area,since the parent rock (gneiss) is poor in basic constituents,soils are all acid in reaction.The pH of the different horizons of the soils ranges from 4.0 to 5.5.The A_0 and A_1 horizons are usually less acid than B horizon,the A and B horizons are much more acid than the parent rock.This shows the leaching process of the soils under such a humid atmosphere. 2.Organic Matter of the soils:The organic matter content of the soils in this area is greatlg influenced by the kind of the vegetation cover.At an elevation of 8,500 feet, the soil developed under forest has 38.92% of organic matter in the A_1,while that under grass has only 11.08% of organic matter in the corresponding horizon.However as the vegetation cover is constant,the dopth of the A_1 and its organic matter content are evidently affected by the elevation.At an elevation of 3,000 feet,the A_1 horizon of the red podzolic soil is only 1 cm.in depth,and it has 3.37% of organic matter.At an elevation of 8,500 feet,howerver,the A_1 horizon of the podzolic soil is 7 cm.in depth, and it has 11.08% of organic matter.In addition,deposition of organic matter in the B horizon is clearly found in the podzolic soil,but it has not been seen in soils found at lower elevation. 3.Active aluminum of the soils:All the soils in this area are high in active aluminum. They contain from 20 to 16 p.p.m.of active aluminum.The content of active aluminum in the different horizons of the same profile has a very close relationship with the pH values of the corresponding horizon.The less acid the reaction the smaller is the amount of acitve aluminum.The active aluminum of the soil is usually higher in amount than that of the parent rock from which the soil is derived. 4.Available calcium magnesium,and potassium of the soils:All the soils are general- ly low in available calcium,magnesium,and potassium.The comparatively high content of these elements in the A horizon is derived from the leaves of the vegetation which are grown on that soil. 5.Available phosphorus of the soils:All the soils of this area are low in available phosphorus. 6.Available nitrate:All soils in this area are very low in nitrate. B.The Vegetation 1.The plants growing on soils of this area are most calcifuge species which are acid- loving (Vaughan and Wishe,1937).As far as the chemical analysis of the soil is concer- ned,those species may be assumed as not only acid-loving,buy also active aluminum- loving (Hutchinson,1943). 2.The distribution of the calcifuge plants In this area is apparently affected by the local climate in terms of elevation.Some of them (temperate plants) are confined to high elevation,others(tropical plants) being limited to low elevation,Two groups of the plants may be given as follows.Many of them are of the same species as those found in southwestern China (Hou,1944). (a) Plants mainly ocurring in areas at elevations from 7,000 to 8,500 foot (temperate plants): Pteridophyta: Destaedtia Scabra (Wall.) Moore Diranopteris linearis Under. Hicrioptris glauea Under. Hymenophyllum crispatum Wall. Hymenophyllum exsertum Wall. Lidsaya cultrata Sw. Lycopodium clavatum L. Plagiogyria pyphylla (Kunze) Mett. Pteridium aquilinum Wightianum Trym Pteris aspericaulis Wall. Flowering Plants: Castanopsis tribuloides A.DC. Lindera pulcherrima Bth. Osbeckia crinata Bth. Rhododendron arboreum Sm. Rhododendron grande Wight Pieris formosana D.Don Vaccinium refersceda HK. Vaccinium serrasum Wight (b) Plants mainly ocurring in areas at elevation from 1,000 to 3,000 feet (tropical plants): Pteridophyta: Adiantum philippense L. Blechnum orientale L. Aglaoorpha coronaus Copel Lycopodium cernum L. Nephrolepsis cordifolia Presl Tectaria spp. Polypodium ucidum Roxb. Flowering plants: Oxyspora paniculate DC. Themeda arundinacea Ridl.

1945年10月中旬,作者留印三月另一周,曾作三次野外调查,计包括印缅边区、恒河平原及喜马拉雅山东南麓等三区,茲先将大吉岭区调查结果,草成此文。调查区域大吉岭位于喜马拉雅山东南麓,在我国西藏边境,全区是山地,海拔自1000到9000尺不等,主为酸性的片麻岩地层,在拔海6500尺地点,年平均气温为56.3℉.,年雨量为122寸。土壤灰壤——灰棕壤组合:在拔海8500尺左右的山顶,灰壤见于草地上,而灰棕壤则发育在森林之下。灰棕壤——灰化黄壤组合:在拔海7000—8000尺地带,森林下仍是灰棕壤,而草地上则为灰化黄壤。灰化黄壤——粗骨土组合:在拔海1000—3000尺地带,片麻岩生成灰化红壤,酸性砂岩生成砾质土。全区土壤特征可归纳如下: (1)土壤 pH 值:全区因土壤母质为酸性片麻岩,各类土壤剖面亦为酸性反应;pH 值约自4.0至5.5。A_1层之 pH 值恒较 B 层为大,而土壤剖面内之 A 层及 B 层均较母岩之酸度为高。 (2)土壤有机质:从土壤有机质分析结果观之,显示植物种类对于土壤有机质之含量高低,有密切的关系,在拔海8500尺之地带,发育于森林下的灰棕壤,表土含有机质38.92%,而同处草类和蕨类植物...

1945年10月中旬,作者留印三月另一周,曾作三次野外调查,计包括印缅边区、恒河平原及喜马拉雅山东南麓等三区,茲先将大吉岭区调查结果,草成此文。调查区域大吉岭位于喜马拉雅山东南麓,在我国西藏边境,全区是山地,海拔自1000到9000尺不等,主为酸性的片麻岩地层,在拔海6500尺地点,年平均气温为56.3℉.,年雨量为122寸。土壤灰壤——灰棕壤组合:在拔海8500尺左右的山顶,灰壤见于草地上,而灰棕壤则发育在森林之下。灰棕壤——灰化黄壤组合:在拔海7000—8000尺地带,森林下仍是灰棕壤,而草地上则为灰化黄壤。灰化黄壤——粗骨土组合:在拔海1000—3000尺地带,片麻岩生成灰化红壤,酸性砂岩生成砾质土。全区土壤特征可归纳如下: (1)土壤 pH 值:全区因土壤母质为酸性片麻岩,各类土壤剖面亦为酸性反应;pH 值约自4.0至5.5。A_1层之 pH 值恒较 B 层为大,而土壤剖面内之 A 层及 B 层均较母岩之酸度为高。 (2)土壤有机质:从土壤有机质分析结果观之,显示植物种类对于土壤有机质之含量高低,有密切的关系,在拔海8500尺之地带,发育于森林下的灰棕壤,表土含有机质38.92%,而同处草类和蕨类植物发育下的灰壤的表土,仅含有机质11.08%,但在相同的植物环境下,拔海高度或局部气候,也是支配土壤有机质含量的重要因素,例如在拔海3000尺地带,长有草类的灰化红壤,仅有极薄之有机质层,该层有机质含量为3.37%,而在拔海8500尺地带,长有草类的灰壤,则有较厚层有机质,其含量为11.08%。 (3)可溶性铝质:全区土壤含有高量可溶性铝,大约自20至160 p.p.m.,其含量与 pH 值高低相关,土壤 pH 值愈酸,可溶性铝含量就愈高。 (4)可溶性钙镁及钾质:全区土壤之可溶性钙,镁及钾等之含量均较低,但就同一土壤剖面而言,富于有机质的 A。或 A_1层的钙镁和钾质,常较 B 层为高,此点显示此等成份是来自植物遗体,亦即指示土壤中有机质与肥力之关系。 (5)全区土壤有效磷含量均甚低。 (6)全区土壤硝酸态氮之含量均极低,并有下淋现象。植物本文所论植物,仅以作者所采集而经各专家鉴定为限,其中以蕨类植物为主。本区的土壤都是酸性反应,所见的植物是以嫌钙性者为主,这些嫌钙性植物与拔海高度的关系很显著,兹将常见的植物种类,叙述如下: (一)主分布于拔海7000—8500尺地带的植物: 蕨类植物 Dennstaedtia scabra(Wall.)Moore Dicranopteris linearis Under. Hicriopteris glauca Under. Hymenophyllum crispatum Wall. Hymenophyllum exsertum Wall. Lindsaya cultrata Sw. Lycopodium clavatum L. Plagiogyria pycniphylla(Kunze)Mett. Pteridium aquilinum Wightianum Trym. Pteris aspericaulis Wall.种子植物 Castanopsis tribuloides A.DC. Lindera pulcherrima Bth. Osbeckia crinata Bth. Rhododendron arboreum Sm. Rhododendron grande Wight Pieris formosana D.Don Vaccinium referesceda HK. Vaccinium Serrasm Wight(二)主分布于1000—3000尺地带的植物: 蕨类植物Adiantum philippense L.Blechnum orientale L.Aglaomorpha coron(?)us copelLycopodium cernuum L.Nephrolepsis cordifolia PresslTectaria spp.Polypodium lucidum Roxb.种子植物Oxysoira paniculata DC.Themedra arundinacea Ridl.

The natural vegetation of Shantung Province, in the north temperate zone, is of the aestisilvae type. As the natural conditions vary in different parts of this province, the vegetation may be divided into the following four regions: 1. Alluvial plain of the Yellow River: This region is located at the northern part of this province. The saline soil is unfavorable for the growth of most plants. The following plants are characteristic: Tamarax chinensis, Apocynum venetum, Suaeda salsa, S. glauca, Artemisin capillaris,...

The natural vegetation of Shantung Province, in the north temperate zone, is of the aestisilvae type. As the natural conditions vary in different parts of this province, the vegetation may be divided into the following four regions: 1. Alluvial plain of the Yellow River: This region is located at the northern part of this province. The saline soil is unfavorable for the growth of most plants. The following plants are characteristic: Tamarax chinensis, Apocynum venetum, Suaeda salsa, S. glauca, Artemisin capillaris, Aeluropus littoralis, Miscanthus sinensis, Phragmites karka, Carex sp. etc.. 2.Western Shantung plain: This region is located at the western part of the province. Most of the land is under cultivation and the soil is rich in calcium. There is no forest. The common trees are Populus tomentosa, P. alba P. davidiana, Ulmus spp. etc., and the herbaceous plants are Cynodon dactilon, Digitaria sanguinalis, Echinochloa colonum, Imperata cylindrica, Chenopodium album, Convolvulus chinensis,Xanthium japonicum, Crypi saculeata, Scirpus maritimus etc.. Plants which grow in the lake district largely belong to Phragmites communis, Scirpus maritimus, Zizania latifolia, Euryale ferox, Trapa bispinosa etc.. 3.Central South hilly region: This region has mostly been transformed into farms for a long time. On the hilly region there are still some remnant forests. The important trees are Pinus tabulaeformis, Biota orientalis. Quercus acutissima, Q. variabilis, Betula chinensis, Tilia mongolica etc.. On account of calcareous soil in this region, Biota orientalis is found most extensively. Gramineae leads all other herbaceous plants in abundance. The following species such as Arundinella amomala, Bothriochloa ischaemum, Setaria viridis, Pennisitum flaccidum etc. have a wide distribution. 4. Shantung Peninsula: The common native plants in this region are Pinus densiflora, Quercus dentata, Q. acutissima, Robinia pseudoacacia, Acer mono etc.. Pious densiflora is a native plant which grows all over the hilly region. Herbaceous plants are mostly Thymus serpyllum, Setaria viridis, S. lutescens etc.. Due to the oceanic climate with higher precipitation and humidity, plants enjoy a more vigorous growth than those in other regions. There develops a richer flora, some even with warm temperate elements.

山东省之位置属于温带,植物分布为落葉闊葉林區,但在鲁中南及膠東區爲丘陵地带,落葉闊葉樹乃與針葉樹成混交林澑鶕∧谥匀粭l件,可将植物分布情况列為四區: 1.黃河冲積平原區:位於北部,為黄河三角州地帶,土壤含鹽分甚重,不宜於植物之生長。樹木只有檉柳、茶棵子等;草本以黄鬚菜、鹼蓬、茵陳蒿,獐毛、芒、蘆葦、黑三稜草等最為砇姟?2.魯西平原區:為西部之黄河冲積平原,多為農田,土壤含鈣甚多。區內無森林,常見之樹木有毛白楊、白楊、山楊、榆等?荼居泄费栏ⅠR唐、芒稷、白茅、藜、旋花、蒼耳、隱花草、荆三稜等。湖泊區域多蘆葦、荆三稜、蒲姜草、芡、菱等。3.魯中南區:為丘陵地區,平緩部分已闢為農田。山區有殘留森林,主要樹種為油松、侧柏、麻櫟、栓皮櫟、堅樺、椴等;土壤石灰質,側柏之繁盛為共特點。草本以禾本科為最多,常見的如野古草、白羊草、狗尾草、白草等,此外如細葉莎草、雞眼草、蚊子草等亦為砇姟?4.膠東區:在山東半島部份,主要樹種為赤松、洋槐、麻櫟、五角楓等,赤松自山麓至山上均有分佈,且為其鄉土,此乃本區之特徵;草本以蚊子草、狗尾草、金狗尾草為最多。在海灘地上少有高大樹木,常見樹種如洋槐、旱柳等均為栽培者,野生木本植物有酸棗...

山东省之位置属于温带,植物分布为落葉闊葉林區,但在鲁中南及膠東區爲丘陵地带,落葉闊葉樹乃與針葉樹成混交林澑鶕∧谥匀粭l件,可将植物分布情况列為四區: 1.黃河冲積平原區:位於北部,為黄河三角州地帶,土壤含鹽分甚重,不宜於植物之生長。樹木只有檉柳、茶棵子等;草本以黄鬚菜、鹼蓬、茵陳蒿,獐毛、芒、蘆葦、黑三稜草等最為砇姟?2.魯西平原區:為西部之黄河冲積平原,多為農田,土壤含鈣甚多。區內無森林,常見之樹木有毛白楊、白楊、山楊、榆等?荼居泄费栏ⅠR唐、芒稷、白茅、藜、旋花、蒼耳、隱花草、荆三稜等。湖泊區域多蘆葦、荆三稜、蒲姜草、芡、菱等。3.魯中南區:為丘陵地區,平緩部分已闢為農田。山區有殘留森林,主要樹種為油松、侧柏、麻櫟、栓皮櫟、堅樺、椴等;土壤石灰質,側柏之繁盛為共特點。草本以禾本科為最多,常見的如野古草、白羊草、狗尾草、白草等,此外如細葉莎草、雞眼草、蚊子草等亦為砇姟?4.膠東區:在山東半島部份,主要樹種為赤松、洋槐、麻櫟、五角楓等,赤松自山麓至山上均有分佈,且為其鄉土,此乃本區之特徵;草本以蚊子草、狗尾草、金狗尾草為最多。在海灘地上少有高大樹木,常見樹種如洋槐、旱柳等均為栽培者,野生木本植物有酸棗、舖地胡枝子等;草本植物多蘆葦、狗尾草等。此區氣候由於受篞笳{節,雨量與溼度亦較高,故植物生長較其他三區繁盛,種類亦較多,亞熱带植物之分布亦多於他處,尤以海邊低地為甚。在自然地理上,秦嶺、淮河一線是中國南北氣候和土壤的重要分界線,也是植物的重要分界線。但是從山東的植物分布上,可以知道這條線並不能絕然的将植物分為南北二部分,因為山東仍是一个過渡的地帶,許多南方植物在魯南及膠東沿海都有分佈,如黄檀、山胡椒、烏桖、厚朴、王蘭、木犀、黄楊、谜葉樹等多种。在另一方面,北方植物分佈至山東為其最南界限者如糠椴、遼珍珠梅、遼磯松、榛等;而赤松、蒙古機、蒙椴等則南达苏北之雲台山。由此可加,山東之植物分佈上,仍在秦嶺、淮河一線之範圍内,如以淮河來作為植物之南北分界線,则并不能完全符合實際情况,尤以膠東沿海低地,南方植物種類繁多,可與淮河流域相此。因此,此一分界线之東端似有北移之必要。山東植物之分佈乃由環境条件综合影響之結果,但在不同地区,各種因素之作用並不一致,由於地形、土壤、温度和水分等之区别而使植物分布不同。本文所举植物種类和分布地點都是從各項资料所得到,作者将其分為四區,並初步提出了這種分区的理由和形成不同分布的原因。但限於材料的不够完全和水平的淺薄,因此本文的內容很不充實, 只能作为令後进一步研究山东植物地理的基础,希望大家提出补充和指出不正确的地方,而使这一项工作能够顺利的完成。

The roles of the natural development and some properties of the soilsin this area are briefly discussed as follows:The soils are saline and calcareous in nature,in which over 70% of thetotal soluble salts are sodium chloride.Slight to moderate alkalinizationmay be developed,while the total soluble salt contents exceed 0.2%;butgenerally,there is no NaCO_3 present.The ground water table in this areais usally high,and the quantity and constituents of the salts in groundwater are directly varied with and influenced...

The roles of the natural development and some properties of the soilsin this area are briefly discussed as follows:The soils are saline and calcareous in nature,in which over 70% of thetotal soluble salts are sodium chloride.Slight to moderate alkalinizationmay be developed,while the total soluble salt contents exceed 0.2%;butgenerally,there is no NaCO_3 present.The ground water table in this areais usally high,and the quantity and constituents of the salts in groundwater are directly varied with and influenced by that contained in the abovesoils.The saline and alkali properties of soils in this area are originatedfrom the parent materials,through the action of the sea water when theywere deposited.As soon as the sea water ceased to affect,the soils as wellas the ground water are gradurally desalinized by natural leaching and thisprocess will be strengthened by the biological activities.As the desalinization of the soils is proceeded further,the ratio ofNa~+/Ca~(++)+Mg~(++)in the soil solution decreased and the amount of the exchan-geable Na on the soil colloidal complex is finally lowered.It is evident thatdesalinization also introduces the dealkalinization of the soils in this area;there is no hazard of strong alkalinization of the soils taken place throughleaching.

本文简要地说明了江苏省沿海地区盐渍土壤的自然发生过程及盐渍特性转化的规律,文中主要论点,可初步归纳如下:1、本区域的土壤,发育于盐渍性的冲积母质,土层中富含以氯化钠为主的可溶性盐类,并呈一定的“碱性”。土壤碱性表现在两方面:一方面是土壤胶体表面存在有较多的吸附性钠,另方面表现在本身具有较高的pH 值。2、在自然发生过程中,土壤盐渍性为地质过程遗留的影响;随受自然降水淋盐,河沟排水排盐及生物作用的影响,开始“脱盐、脱碱”和肥力积累过程,发育成为本区内现存的各种不同盐渍程度的土壤。3、随着土壤脱盐作用的进行,土壤盐渍的组成在变化;主要是可溶性盐阴离子中钠离子的含量淋失较速,最后降低了土壤溶液中Na~+/Ca~(++)比率。由于这种盐渍组成的改变,土壤胶体上吸收性Na~+也相应的降低,从而导致土壤的脱碱作用。因此本区土壤的脱盐不致引起土壤碱化。4、在自然发生过程中,本区域盐渍土的脱盐过程,一直是在潜水位较高的情况下进行的。在脱盐过程中,潜水位经常在临界水位以内,为本区自然脱盐过程中,最大特点;潜水动能和土壤的脱盐过程,存在着许多内在的联系。在一定地区内,一...

本文简要地说明了江苏省沿海地区盐渍土壤的自然发生过程及盐渍特性转化的规律,文中主要论点,可初步归纳如下:1、本区域的土壤,发育于盐渍性的冲积母质,土层中富含以氯化钠为主的可溶性盐类,并呈一定的“碱性”。土壤碱性表现在两方面:一方面是土壤胶体表面存在有较多的吸附性钠,另方面表现在本身具有较高的pH 值。2、在自然发生过程中,土壤盐渍性为地质过程遗留的影响;随受自然降水淋盐,河沟排水排盐及生物作用的影响,开始“脱盐、脱碱”和肥力积累过程,发育成为本区内现存的各种不同盐渍程度的土壤。3、随着土壤脱盐作用的进行,土壤盐渍的组成在变化;主要是可溶性盐阴离子中钠离子的含量淋失较速,最后降低了土壤溶液中Na~+/Ca~(++)比率。由于这种盐渍组成的改变,土壤胶体上吸收性Na~+也相应的降低,从而导致土壤的脱碱作用。因此本区土壤的脱盐不致引起土壤碱化。4、在自然发生过程中,本区域盐渍土的脱盐过程,一直是在潜水位较高的情况下进行的。在脱盐过程中,潜水位经常在临界水位以内,为本区自然脱盐过程中,最大特点;潜水动能和土壤的脱盐过程,存在着许多内在的联系。在一定地区内,一定盐渍程度、盐渍特性的土壤,则常有和其相适应的矿化潜水类型。在自然发生过程中,随土壤的脱盐和盐渍特性的转化,潜水似亦随之发生相应的淡化和化学性质的变化。二者转化趋势,大致相符。彼此间的关系,是互相依存、互相制约的,在不断运动的过程中,似先有土壤的脱盐,而生导向潜水的淡化;但就土壤脱盐的过程言,本身同时又是潜水淡化的结果。5、在土壤脱盐的过程中,土壤盐分的动能比较复杂,一方面是全区土壤不断地脱盐,另方面是在一定的条件下,又可产生局部地区土壤表层的盐渍化。前者为本区盐渍土壤自然发生过程的实质,后者为临时性现象。此种现象,最终亦必随同潜水的转向淡化而逐渐消除。

 
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