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土壤变化     
相关语句
  soil changes
     Agriculture and Soil Changes
     农业生产与土壤变化
短句来源
     A Study on Soil Changes of the First Three Years after Introducing Eucalyptus calophyllaLin Dexi
     引种尾叶桉后前3年土壤变化研究
短句来源
     The interaction of soil changes and climate changes at the global level is emphatically discussed in the paper.
     本文着重论述了“土壤变化”与“全球气候变化”之间的相互作用。
短句来源
     The research scope and contents of pedosphere in global soil changes include material cycling in pedosphere and the other geospheres;
     土壤圈在全球土壤变化中的研究内容包括:土壤圈与地圈各圈层的物质循环;
短句来源
     And then the main quantitative evaluation methods of soil change was introduced. The problems of soil change's studies was reveales. It was suggested that the key study area of soil change study in the future should be located on medium and large scale soil changes in a long time in order to provide scientific evidences for sustainable and high profit agriculture development.
     系统地分析了土壤变化概念、类型及其变化因素 ,重点论述了当代农业利用的特点及其对土壤环境和土壤性质的影响 ,阐述了当前土壤变化的定量化评价方法 ,揭示了土壤变化研究存在的问题 ,提出了土壤变化研究的重点应放在中尺度和大尺度上 ,为区域持续农业的高效发展提供科学依据。
短句来源
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  soil change
     Analysis on Current Situation of Soil Change Studies
     土壤变化研究现状浅析
短句来源
     Simulation on Slope Erosion Process for Soil Change
     应用于土壤变化的坡面侵蚀过程模拟
短句来源
     Since soil change might be a relatively slow process, SLEMSEP is capable of long term simulation if necessary.
     SLEMSEP模型可进行长期模拟,应用于土壤变化和可持续利用的研究。
短句来源
     And then the main quantitative evaluation methods of soil change was introduced. The problems of soil change's studies was reveales. It was suggested that the key study area of soil change study in the future should be located on medium and large scale soil changes in a long time in order to provide scientific evidences for sustainable and high profit agriculture development.
     系统地分析了土壤变化概念、类型及其变化因素 ,重点论述了当代农业利用的特点及其对土壤环境和土壤性质的影响 ,阐述了当前土壤变化的定量化评价方法 ,揭示了土壤变化研究存在的问题 ,提出了土壤变化研究的重点应放在中尺度和大尺度上 ,为区域持续农业的高效发展提供科学依据。
短句来源
  change of soil
     Study on Change of Soil in Several Plantations in Tropical Area of Yunnan
     云南热区几种人工林土壤变化研究
短句来源
     The approximate trend of the change of soil in the plantations of four species is that soil fertility declined slightly from 1993 to 1995, and rose a little from 1995 to 1997.
     4种人工林土壤变化的大致趋势是:1993~1995年肥力大多略呈下降趋势,1995~1997年有所上升。
短句来源
     Soils were selected from several plantations, including Picea asperata Pinus tabulaeformis, Pinus armandii and Larix kaempferi and secondary shrub in Dagou Watershed of the upper reach of Minjiang River. The measurement of TOC, SMBC,WSOC and EOC were made, because these parameters can reflect change of soil characteristics.
     本研究选择岷江上游大沟流域的几种人工林(云杉林、油松林、华山松林、日本落叶松林)以及次生落叶阔叶灌丛下土壤,通过剖面机械分层取样,测定土壤总有机碳(TOC)和三种活性碳组分微生物碳(SMBC)、水溶性碳(WSOC)、易氧化碳(EOC)等来反映土壤变化特点。
短句来源
  “土壤变化”译为未确定词的双语例句
     Study on effects of pinus elliottii stands on soil
     湿地松林分土壤变化研究
短句来源
     The Changeful Research of Vegetation and Soil in the Process of Ecological Restoration on Sandification Rangeland of Dry Steppe
     干草原沙化草地生态恢复过程中植被与土壤变化研究
短句来源
     Soils under phyllostachy pubescens stand had a lower (P<0.05) proportion of MBC than under broad-leaved, masson pine and Chinese fir.
     土壤水溶性有机碳含量的季节动态变化3种林分变化趋势基本一致,表现为冷季高而暖季低,马尾松林土壤变化相对较大,衫木林、阔叶林变化幅度较小,3种林分下土壤WSOC的季节变幅大于EOCI。
短句来源
     According to these indicators, and based on the investigation and statistics data from the big sample random sampling, the indicators about the population, land resources distribution, crops output, and the changing situation of GDP, water, soil, sandstorm disaster, and the wild animal population in the program region were systematically studied, and based on the results, the social, economical, and ecological benefits of the Grain for Green Program were objectively evaluated.
     根据这些评价指标,以大样本随机抽样的调查、统计数据为基础,分别对退耕还林工程区人口、土地资源分配状况、农作物产量和国民产值变化情况、水文变化、土壤变化、沙尘暴气候变化、灾害性气候变化、野生动物种群变化等指标进行了系统研究,在此基础上,对退耕还林工程的社会、经济、生态效益进行了客观评价。
短句来源
     Firstly, the effects of different tillage systems on soil temperature existed difference.
     (1)土壤温度:不同耕作方式比较,深松覆盖和免耕覆盖土壤温度低温时有增温效应,高温时有降温效应。 从不同土层看,浅层(0~15cm)土壤变化幅度较大;
短句来源
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  soil changes
The results show that the cohesion of unsaturated soil changes greatly, and the friction angle changes in little with soil moisture content.
      
Lignin concentration was unrelated to either the vegetation gradient or any of the soil changes it encompassed; however, astringent phenolics increased by 275% over the same gradient.
      
A simple erosion/productivity model, Soil Changes Under Agroforestry (SCUAF), is used to predict maize yields over 25 years.
      
An erosion/productivity model, Soil Changes Under Agroforestry, was used to predict the effect of erosion on maize yields.
      
We characterized soil changes with afforestation using ten paired stands of native grasslands and Eucalyptus plantations (10-100 years of age).
      
更多          
  soil change
There are five major hypotheses to explain the apparently synchronous, widespread, spectacular, specific, and sudden elm decline in north-west Europe - climatic change, soil change, competition, human impact, and pathogenic attack.
      
Properties of the soil change as the amount of water occupying the voids varies, and also because of structural change associated with management and with biological activity.
      
Appropriate relate to soil change and the dynamic nature of soil.
      
Integrating soil change in soil survey requires ad-In addition to the amount of C that could be restored, vances in the science of soil change.
      
Making new advances in soil friendly products related to soil change.
      
更多          
  change of soil
It was also obvious from ordination results that some important environmental factors, such as tempo-spatial change of rainfall and corresponding tempo-spatial change of soil moisture, were neglected during direct gradient analysis.
      
Ecological distribution and seasonal change of soil microorganisms in pure and mixed plantations
      
At last the regional change of soil erosion amount on the basis of the color map is analyzed.
      
Past erosion, however, is the most important component to induce change of soil properties.
      
Both gypsum and sulfur reduced potato scab and measurements indicate that change of soil pH was slight (0.1-0.4 pH reduction).
      
更多          
  soil transformation
Observed linkage of genetic markers was greater in soil transformation than in standard laboratory procedures.
      
Soil transformation of 2(3H)-benzoxazolone of rye into phytotoxic 2-amino-3H-phenoxazin-3-one
      
Soil transformation of wheat and corn metabolites mboa and DIM2BOA into aminophenoxazinones
      
The soil transformation is similar of that undergone by the rye metabolite 2(3H)-benzoxazolone (BOA) into 2-amino-3H-phenoxazin-3-one.
      
There also was no evidence that hay-scented fern natural products or their soil transformation products built up in the soil.
      
更多          


Physical properties of three types of paddy soil collected from south Kiangsu province were studied.The shearing strength of paddy soils increases with the decrease ofmoisture content,especially below the lower plastic limit.Maximum compressibility ap-pears at the high moisture content and it falls sharply near the middle part of plasticityrange.As compared with the soils of heavy texture,the light paddy soils have a highercompressibility and lowering soil water content to a greater extent is necessary to reducetheir...

Physical properties of three types of paddy soil collected from south Kiangsu province were studied.The shearing strength of paddy soils increases with the decrease ofmoisture content,especially below the lower plastic limit.Maximum compressibility ap-pears at the high moisture content and it falls sharply near the middle part of plasticityrange.As compared with the soils of heavy texture,the light paddy soils have a highercompressibility and lowering soil water content to a greater extent is necessary to reducetheir compression.The soil moisture causes shrinkage,especially for soils of heavy texture.Shrinkage makes the paddy soils more compact than mechanical pressure.It issuggested therefore that the optimum soil moisture for the fall cultivation ranges fromlower plastic limit to the medium plasticity and for the spring cultivation the optimummoisture content may be higher than in the fall.

从水稻土的抗切强度,压缩性,收缩性与水分含量的关系作了初步研究和讨论。水稻土的抗切强度随着湿度的降低而增高,塑性下限以下增加更为强烈,不存在一般所谓湿度稍低于塑性下限有一抗机械强度较小的酥软结持阶段。土壤(原状土)的压缩性以湿度大时为最高,随着湿度的降低而变小,接近塑性范围的中部,有一明显的转折点,在这转折点以下(或塑性范围的下部),土壤实际的压缩性是较小的。与旱地土壤的变化规律不一致。原因是水稻土垒结状况和粘结的条件不同。质地轻的土壤比粘重的土壤压缩性大,其压缩性降低至较小程度需要降低的土壤湿度比粘重的土壤为多,但其收缩变紧的程度不强烈,粘重水稻土在湿度降低时发生强烈收缩,使土壤变紧;当土壤湿度在塑性以下时,收缩引起土壤紧实的程度比一般人为的机械压力还更大,只有当湿度较大时,才有较高的总孔隙度。根据这些特性,提出水稻土秋耕适宜的土壤湿度是:以塑性下限为底限,以塑性中部为上限,对质地较轻的土壤,上下限宜酌量降低,但其上限不一定在塑性以下。适宜春耕的湿度比秋耕可大一些,因为晒垡和水中耕作,可再疏散土壤。

The West Tianmu Mountains, located in north-western Zhejiang Province, are among the National Nature Protection Areas in China.According to the data obtained from a number of field observations,soil chemical and physical analyses, clay differential thermal analyses, and X-ray diffraction pattern and microscope electron examinations, it has been found that the soils in this mountain area are of a distinct allitic character,the silica-alumina ratio approximating to 2. Among the clay minerals,kaolinite is dominant,...

The West Tianmu Mountains, located in north-western Zhejiang Province, are among the National Nature Protection Areas in China.According to the data obtained from a number of field observations,soil chemical and physical analyses, clay differential thermal analyses, and X-ray diffraction pattern and microscope electron examinations, it has been found that the soils in this mountain area are of a distinct allitic character,the silica-alumina ratio approximating to 2. Among the clay minerals,kaolinite is dominant, gibbsite being the second in importance. The soils show strong acid reaction, with a high content of active aluminuin. The soil morphological features conform to those of the Yellowish character.According to the soil features and the national conditions, they are considered to belong to the great soil group of the Mountain Yellow Earth.The soils from mountain top to the foot (the altitude of 1507 to 400M.above sea level), can again be divided into three main subgroups: Mountain Bleached-podzolied Yellow Earth, Mountain Surface Glei Yellow Earth and Yellow Earth.We got chances to make observation there twice respectively in the year of 1959 and of 1980. A comparison of the results shows that the forest ecological system there is in a state of dynamic equilibrium. The increase of forest biomass has led to the increase of residues, soilhumus and soil water capacity. The soil base contents are decreased by leaching water. As a result, the soil acidity is increased. The changes of soil property, in turn, have had some effect on the components and structures of the forest colonies.

根据野外调查和土壤理化分析、差热分析。X射线分析等资料,说明西天目山南坡土壤具明显富铝化特征,硅铝率2左右,粘土矿物以高岭石为主,并含较多三水铝矿,酸性强、活性铝含量较高,土壤剖面呈明显的黄化特征,故统属黄壤类土壤。从山顶到山麓又可续分为山地漂灰黄壤、山地表潜黄壤和山地黄壤等亚类。 从1959和1980年两次相距21年的观察和测定,说明西天目山森林生态系统处于缓慢的动平衡中。森林生物群落主组分生物量的增长,导致森林郁闭度、残落物和土壤蓄水量的增长,自然水不断对土壤进行盐基淋洗和酸化作用,而土壤的变化又反过来影响森林群落的组成和结构。

The interaction of soil changes and climate changes at the global level is emphatically discussed in the paper. Some greenhouse gases, such as carbon dioxide, methane and nitrous oxide, especially the methane and nitrous oxide caused by soil physical, chemical and biochemical changes and land use changes, release to the atmosphere from the pedosphere. It exerts a significant effect on the global climate changes. Meanwhile, the global warming may lead to a more serious soil degradation that includes soil desertification,...

The interaction of soil changes and climate changes at the global level is emphatically discussed in the paper. Some greenhouse gases, such as carbon dioxide, methane and nitrous oxide, especially the methane and nitrous oxide caused by soil physical, chemical and biochemical changes and land use changes, release to the atmosphere from the pedosphere. It exerts a significant effect on the global climate changes. Meanwhile, the global warming may lead to a more serious soil degradation that includes soil desertification, acidification and salinization. Strengthening science propaganda to improve the environmental consciousness of people and reinforcing scientific research and monitoring to put forward some appropriate measures are important strategies for fitting or changing the global changes as stated above.

本文着重论述了“土壤变化”与“全球气候变化”之间的相互作用。土壤圈通过其内部一系列的理化、生化变化及土地利用变化等,产生CO_2、CH_4、N_2O等“温室效应”气体特别是CH_4和N_2O向大气的排放,对“全球气候变化”产生重要的影响,而全球气候变暖又会引起土壤沙漠化、酸化、盐渍化等退化过程的进一步加剧,严重改变人类生存的环境。加强科学宣传,提高全球民众环境意识,加强科学研究与监测,提出相应措施,是适应或改变上述全球变化的重要战略对策。

 
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