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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
    Effect of Crystal Organic Fertilizer on Water-stable Aggregates and Micro-structure of Soils
    结晶有机肥对土壤水稳性团粒组成及微结构的影响
    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。
    Water stable aggregate (>0.5mm) under NTC treatment significantly higher (P< 0.001) than all other treatments.
    降雨前不翻耕+覆盖(ntc)处理0-10 mm土壤>0.5mm水稳性团粒结构百分含量极显著高于其它处理(P<0.001);
    Organic matter,total nitrogen and water -stabilizing soil aggregate with sizes 0. 25-10mm increased by 37. 4%-49. 5%, 11. 7%-21. 0% and 51.1%-62. 0% respectively. Soil nutrients also tended to increase and soil fertility enhanced obviously.
    土壤有机质、全氮和10~0.25mm粒径的水稳性团粒含量分别提高37.4%~49.5%、11.7%~21.0%和51.1%~62.0%,土壤养分呈增加趋势,肥力明显提高。
    no-tillage is helpful for forming water-stable crumb bigger than0. 25 mm.
    免耕有利于>0.25mm水稳性团粒的形成。
    Applying polyacrylamide can increase soil sedimentation coefficient 11~14 percent point, structure coefficient 5.5~6.0 percent point, waterstable aggregates 4.16~11.32 percent point compared with no polyacrylamide on sloping field.
    与对照相比 ,施用聚丙烯酰胺后土壤沉降系数提高 11%~ 14 % ,结构系数提高5.5%~ 6 .0 % ,水稳性团粒含量增加 4 .16 %~ 11.32 %。
    Indexes including organic matter content, water stable aggregate content, mean weight diameter of water stable aggregate, aggregate degree and disperse coefficient were selected to evaluate soil anti erodibility of soil and water conservation forests component of different tree species at different ages.
    运用土壤有机质含量、水稳性团聚体含量、水稳性团粒平均重量直径、团聚度和分散系数等各项指标 ,对不同树种组成、不同林龄水土保持林的土壤抗蚀性能进行分析、评价 .
    The content of water stable aggregate in 0~20cm layer was increased in no tillage in that the soil structure was less destroyed.
    免耕对土壤结构破坏少 ,使 0~ 2 0cm土层水稳性团粒结构增多 .
    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。
    From the analysis of soil physical mechanics properties, the clay content and physical clay content decreased 2.74% and 3.01% respectively, and the > 0.25 mm water stable aggregate content also decreased 58.7%, the soil unit weight increased and the soil shear strength decreased, all of which were easier to cause soil erosion.
    通过分析土壤物理力学性质表明,林地开垦侵蚀10年土壤粘粒和物理性粘粒比林地分别减少2.74%和3.01%,土壤向粗骨化趋势发展,>0.25 mm水稳性团粒含量减少58.7%,土壤容重增大,抗剪强度下降,抵抗径流冲刷能力减弱,造成土壤侵蚀更易发生;
    The results of the correlation analysis showed that > the 0.25 mm water stable aggregate content was the maximum affecting factor to soil erosion, the partial correlated coefficient was 0.9728, and then were soil coarse grain and soil shear strength, the partial correlated coefficients were 0.8879 and 0.6020 respectively.
    应用相关分析表明,>0.25 mm水稳性团粒含量的改变对土壤侵蚀强度影响最大,其偏相关系数为0.9728,其次是土壤的粗粉粒和抗剪强度,偏相关系数分别为0.8879和0.6020;
    The relation between the >0.25 mm water stable aggregate content, the soil sheer strength and the soil erosion intensity were analyzed.
    分析>0.25 mm水稳性团粒含量和抗剪强度与土壤侵蚀强度关系表明,林地开垦后侵蚀1年和侵蚀7年为土壤侵蚀加剧的转折年限,说明退化的侵蚀土壤和退化的生态环境加剧了土壤侵蚀的发生和发展。
    The results showed that,all three types of macromolecule polymers have significant effect of improving soil physical properties. Compared with the control,the content of water-stable aggregate and the soil permeability increased by 17.27% and 41.81% respectively,and the soil bulk density decreased by 11.18% and the ability of holding water increased by 2.8 times.
    结果表明:1)3种高分子聚合物均是较好的土壤结构改良剂,经聚合物处理后的土壤水稳性团粒含量平均增加17.27%,渗透性能提高41.81%,密度减小11.18%,土壤持水能力较对照提高2.8倍。
    PAM with a molecular weight ranging from 10 to 12 mg/mol performed most effectively to improve percent water stable aggregation.
    0.25 mm水稳性团粒结构的调控效果以分子量为10~12 mg/mol的PAM最为明显。
    Study on Improving Soil's Waterstable Aggregates Amounts by Botanic Roots
    植物根系提高土壤水稳性团粒含量的研究
    The indexes of the experiment include: the water aggregate stability of soil, soil quality, the organism quantity, runoff, quantity of the soil loss, the difference time of formatting runoff, the maximal holding of water in soil, the last rate of water infiltration, soil density, the rate of evaporation, the factor K of the soil credibility based on the RUSLE.
    实验中测定的指标包括土壤水稳性团粒结构、土壤质地、土壤有机质含量、降雨产生的径流、径流携带的烘干土质量、产生径流的时间差、土壤的最大持水量、土壤的入渗率、土壤的容重、土壤水分蒸发量及蒸发率、根据修正通用水土流失方程计算的因子K值。
    A significant differences was found under tillage treatment without surface cover between before and after rainfall simulator running (P< 0.001), indicating tillage could increase the soil erosion.
    降雨后翻耕不覆盖处理土壤的水稳性团粒结构百分含量由降雨前的6.8%增加到降雨后的26.8%,达到极显著水平(P<0.001),
    3. The structural units with diameters larger than 5 mm. seem to be different in nature from those aggregates having 1-5 mm.
    3.各輪作区,凡土埌有机質含量較高的,其直徑为1—5毫米的水稳性团粒也比較多;
    Based on the analysis of physical and chemical features such as the water content of soil, crumb structure subject to water-stability and organic matter content of soil disturbed or undisturbed through simulated rainfall test, the paper pointed out that the rate of various features varied slightly. Most of them rounded 5%, and almost identified in the shallow layer.
    本文通过人工模拟降雨试验,分析了扰动与未扰动试验区土壤的含水率、水稳性团粒结构、有机质含量等理化特性的差异,指出扰动土经过人为处理后,土壤理化特性与未扰动土误差大多在5%左右,仅个别超过10%,浅层土的理化特性基本一致.
 

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