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    Study on the Effects of PVA on the Formation of Soil Water-stable Crumbe
    聚乙烯醇形成土壤水稳性团粒的效果研究
    Soil waterstable aggregate contents and chemical properties of bamboo(Phyllostachys heterocycla) and broadleaved mixed forest stands were studied in Jiangxi province. Researched stands can be divided into Type A(bamboo stands),Type B(5%~15% broadleaf trees),Type C(15%~25% broadleaf trees),Type D(25%~35% broadleaf trees) and Type E(35%~45% broadleaf trees).
    选取代表性竹阔混交林,根据阔叶树所占比例分成5种类型,即类型A(毛竹纯林)、类型B(阔叶树比例5%-15%)、类型C(阔叶树比例占15%-25%)、类型D(阔叶树比例占25%-35%)、类型E(阔叶树比例占35%-45%),分别测定林分土壤水稳性团聚体及化学性质。
    The results revealed that Type A had the lowest soil waterstable aggregate content,but highest soil structure destroy rate(average 37.27%),Type C had the lowest soil structure destroy rate(average 12.33%).
    结果表明:A类型林地土壤大于0.25 mm水稳性团聚体数量最少,土壤结构破坏率最高,平均达37.27%,类型C的土壤破坏率最低,平均为12.33%;
    After wet sieving, water stable aggregate showed the highest fraction at the size of <0.25mm,while micro-aggregate was distributed from 0.25mm to 0.01mm size.
    土壤水稳性团聚体的粒级分布(PSD)均以<0.25mm居多,土壤微团聚体的粒级分布则以0.25-0.01mm粒级为主。 水稳性团聚体的含量随粘粒含量的增加而增加。
    The results show that soil OM content has obviously closer relationship with >0.25mm soil water stable aggregate content (%) than that of soil nitrogen and phosphorus content.
    试验结果表明,土壤有机质含量x(%)与土壤>0.25mm水稳性团聚体含量y(%)呈显著线性正相关,土壤全氮、土壤全磷与>0.25mm土壤水稳性团聚体也呈指数关系;
    Soil nitrogen and phosphorus content (%) have exponential relationship with >0.25mm water stable aggregate content (%).
    土壤有机质含量与>0.25mm土壤水稳性团聚体含量关系更密切一些,可以用土壤有机质含量和土壤团聚体平均重量粒径(MWD)来表示土壤团聚体的水稳定性的大小。
    (2) There are several factors which can Jesuit the breakdown of soil aggregate, but the main reasons are due to rainfall density (including single raindrop) and different prewetting rate.
    破坏>5mm土壤水稳性团聚体所需雨滴打击能量远大于破坏其他粒级土壤团聚体的能量,前期处理不同,土壤团聚体破坏所需雨滴打击能量不同,而2-1mm的土壤团聚体的稳定性则相对稳定。
    The energy discharged in the breakdown of soil aggregate has a close relation with soil structure and water stability ofsoil aggregate.
    能量法:土壤团聚体破坏所需雨滴打击能量与土壤质地和土壤团聚体水稳性有密切关系,土壤团聚体的水稳性越好,破坏时所需能量越多。
    The experiment conclusions are as follows:1 Absorbent can improve the physical characteristics of soil obviously which lower the soil quantity, increase the terminal rate of infiltration and the maximum water content in soil, and the percentage of the water aggregate stability of soil more than 2mnu lmm, 0.25mm are different distinctly.
    1、保水剂可显著改善土壤的物理性状,降低土壤容重,>2mm,>1mm,>0.25mm土壤水稳性团粒结构百分比显著不同,提高了土壤的最终水分入渗率和最大持水量。
    On the contrary there was a correctitude correlation between MWD and amount of <0.25mm aggregate。
    分形维数与>0.25mm水稳性团聚体含量负相关,平均重量直径与>0.25mm 水稳性团聚体含量呈显著的正相关关系。
    (2) It was found that >0.25mm,>0.5mm water stable aggregates and water stable index can be regarded as the optimum 3 indexes to express soil anti-erodibility of the main forest types in Anji County by means of principal component analysis.
    (2)衡量安吉地区土壤抗蚀性的最佳3个指标是:>0.25mm水稳性团聚体、>0.5mm水稳性团聚体和水稳性指数。
    Applying stepwise regression (the fiducial degree is 0.05), the equation of soil moisture content (y) can be expressed: y= 486. 709+ 2. 061X4 + 1.786X9 - 4.451X10 (R =0.830,X4 :content of waterstable granule, X9:rain fall before 15d, X10: evaporation from water surface).
    运用逐步回归(a=0.05)方法,建立土壤含水量(y)及其影响因子(X_4为水稳性团粒含量,X_9为测土壤水前15d的降水量,X_(10)为水面蒸发量)线性方程为y=486.709+2.061X_4+1.786X_9-4.451X_(10),R=0.830。
    In the 0~20 cm soil depths, in all the proportions, the waterstable aggregation(d>0.25) was improved by 6.21% compared to that under the pure fir forest.
    各模式 0~ 2 0cm土壤 >0 .2 5mm的水稳性团聚体含量比杉木纯林提高 6.2 1 % ;
    There is abundant radily nutrient in the locust×sea-buckthorn mixed forest,and there are a mass of clay and water-stable aggregate which is ≥0.25mm in it.
    其中刺槐×沙棘混交林地速效养分丰富,粘粒和≥0.25mm水稳性团聚体的数量大;
    In 0~20 cm soils layer,contents of the organic matter and water stable aggregates of the four kinds of shrubbery were much higher than that of the barren slope.
    4种灌木林地0~20 cm层土壤的有机质含量、水稳性指数和水稳性团聚体含量均大于荒坡地,土壤侵蚀量明显低于荒坡地。
    compared with the content of water stable aggregates in undisturbed forestland,the contents of water stable aggregates of >0.25 mm decreased separately by 16.59%,43.12% and 61.13%,the contents of water stable aggregates of >1.0 mm are separately 27.78% and 24.34% that of in undisturbed forest land;
    粘粒下降了8.10%、20.84%和30.72%,土壤表现出粗骨化趋势; >0.25mm水稳性团聚体含量比无干扰林地分别下降了16.59%、43.12%和61.13%,>1.0mm的团聚体含量仅为无干扰林地土壤的27.78%和24.34%,1.0~0.25mmm的团聚体下降幅度较小;
    wilfordii,and>0.25 mm composition of aggregates of subsurface soil,water holding capacity,and water conservation capacity increased by(3.2%,)(37.4%,)736.513 t·hm~(-2)respectively,while structure destructive rate of the soil decreased by 3.7%.
    与毛竹纯林相比,混农经营地土壤结构和水分性状得到一定程度的改良,表土层>0.25 mm的水稳性团聚体含量增加3.17%,结构体破坏率降低4.51%,土壤持水量增加37.4%,水源涵养量增加736.513 t. hm-2。
    Study on Soil Water Stable Aggregate of Grassland and Forest Flood During Grazing in Hilly and Gully Regions on the Loess Plateau
    黄土高原丘陵沟壑区放牧林草地团聚体水稳性的研究
    Following conclusions can be reached:(1) There are several factors affecting water stability of soil aggregate (WSA) such as soil OM (organic matter), soil nitrogen and phosphorus content, vegetation, and no-tillage years, et al.
    (1)影响土壤团聚体水稳性的因素主要有土壤有机质、土壤全磷、土壤全氮和土壤植被以及退耕年限等。
    (3) Three methods are to be used to quantitatively assess WSA on the basis of wet -sieve methods.
    所用的团聚体的水稳性定量评价是基于土壤湿筛法组分基础上的评价。
 

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