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micro aggregation
相关语句
  微团聚体
     Taking micro aggregation d < 0.25 ? mm in Pteridium aquilinum's producing area as dependent variable, and taking organic matter, total N, total P, total K, available N, available P, available K as independent variable, were analysed in terms of path analysis. The results showed: available P is main factor of positive effect, secondly available N and organic matter on mass fraction of micro aggregation d < 0.25 ?
     以野生蕨菜产地中d <0 .2 5mm的土壤微团聚体质量分数为依变量 ,以有机质、全氮、全磷、全钾、速效氮、速效磷、速效钾为自变量进行了通径分析 ,结果表明 :对d <0 .2 5mm土壤微团聚体质量分数有正效应的主要因子为速效磷 ,其次为速效氮和有机质 ;
短句来源
  相似匹配句对
     Micro-aggregate fractions decreased and degree of aggregation improved with elevationincrement.
     土壤表层的微团聚体随海拔升高而降低,其团聚度随海拔升高而显著上升。
短句来源
     Micro-Optics
     微光学
短句来源
     On Micro-Location
     微区位研究
短句来源
     THE ANTIPLATELET AGGREGATION OF MICRO CAPSULE POWDER OF ENTERIC-CHARACTERISTIC PLC
     PLC肠溶性微囊粉的抗血小板聚集作用
短句来源
     The aggregation of C.
     通过观察不同条件下C.
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  micro aggregation
The micro-aggregation procedure has been implemented at Eurostat using different techniques according to the type of variable.
      
Particle perimeter distribution analysis was applied to look at micro-aggregation with VR-1516.
      


In this study the physical properties of surface soil were investigated under different conditions. From the results obtained, we may come to the conclusion that good soil physical properties, which are resistant to soil erosion, are exhibited by high content of organic matter, large quantity of >0.25 mm total aggregate and 1-10mm aggregate, and the state and degree of micro-aggregation.

本文对甘肃省东部子午岭地区8个土壤剖面的团聚体总量、1—10毫米团聚体量、团聚状况和团聚度作了研究,发现灌木地和草地的这些物理性质比林地好,草地比农地好,同一土壤剖面中,上层比下层好,土壤质地粘的比质地轻的好。还发现这些物理性质的数值随着土壤抗侵蚀性能的增强而增高。本文还研究了这8个土壤剖面的团聚体分散度,其值随土壤抗侵蚀性能的增强而下降,因此,这些物理性质可作为土壤抗侵蚀性能的指标。文章同时还研究了这些土壤的分散率与侵蚀率。所得结果是随着草被破坏,分散率及侵蚀率增大。土壤愈粘重,侵蚀率愈小,这与Middleton的结果是一致的。但Middleton以侵蚀率“10”作为易侵蚀与难侵蚀之分界点,而我们的分析结果,最低值为粘质土,尚高达19.0,由此看来,似乎该区皆为易侵蚀土壤,但是未必是正确的。看来,侵蚀率在黄土地区应用,其分界点还值得进一步研究。

Degradation of farmland Red Earth is one of the severe problems facing agriculture in South China.Since 1990's,agronomical measures such as vegetation recoveries have been taken for its mitigation.In previous studies,role of vegetation recoveries on rapid rebuilding of soil organic carbon(SOC) and micro\|aggregation has been debated.The objectivity of present study is to describe the redistribution of SOC and heavy metals of human risk concerns and partitioning in the soil particle size fractions...

Degradation of farmland Red Earth is one of the severe problems facing agriculture in South China.Since 1990's,agronomical measures such as vegetation recoveries have been taken for its mitigation.In previous studies,role of vegetation recoveries on rapid rebuilding of soil organic carbon(SOC) and micro\|aggregation has been debated.The objectivity of present study is to describe the redistribution of SOC and heavy metals of human risk concerns and partitioning in the soil particle size fractions as affected by the vegetation recovery practices. The samples were collected at the Grass Extension Station of Jiangxi Province,10 km northwest to Nanchang City.Being typical in central Jiangxi,the soil was Typical Udsiallisols (Chinese Soil Taxonomical Classification,1999)derived from old Quaternary deposits on the rolling slopes.The treatment plots were:A,rotation of corn and cabbage(for 4a);B,continuous white clover(for 15a);C,continuous orchard grass(for 15a) and rotation of Chinese Lespedeze\|Sudan grass(for 3a after 15a grass)(Table 1).A mixed sample of 5 undisturbed sub\|samples was collected randomly in each plot and in 0~10cm,10~20cm respectively. The undisturbed soil clods were dispersed in water using the ultrasonic energy at 21 5Hz and 300mA.Soil particles in size of >2mm,2~0 25mm were separated by wet sieving,those in size of 0 25~0.02mm and 0 02~0 002mm by sedimentation and siphon,and those in size of <0 002mm by centrifuging.The contents of organic carbon,Pb and Cd contents in the particle separates were determined by wet combustion and HF\|HNO 3\|HClO 4 digestion.The concentration of the metals were measured by AAS with the internal standard control. Prominent variation was found in the content of SOC and Pb and Cd contents among the soil particle fractions,with highest contents in the fraction<0 002mm(Table 2,Fig.1).The fractions of 2~0 25mm and 0 25~0 02mm generally possessed 50% and 20% of the total amount of the analyzed components respectively.Significantly positive correlation was found between the portion of Pb or Cd and that of SOC in the soil particle fractions(Fig.2).Compared with that in the uncultivated soil,the recovery treatments enhanced accumulation of SOC and decreased of Pb and Cd in the predominant particle fraction of 2~0 25mm,whereas elevated Cd level in the 0~10cm layer(Table 4).Under the corn\|cabbage rotation,no remarkable variation was shown of SOC and heavy metals in the soil particle fractions as compared to that under the other treatments.Therefore,the vegetation recovery measures had not only beneficial effects on SOC sequestration(Li, et al .2001),but also affected the distribution pattern of both SOC and heavy metals in soil particle fractions.However,the effects of these measures on bioavailability of the measured components in the particle fractions remain to be determined.

采用原状土壤水稳性团聚体分离方法提取不同粒径的土壤颗粒 ,测定其有机碳及重金属元素 Pb、Cd的含量 ,研究了退化红壤在植被恢复下表层 (0~ 1 0 cm和 1 0~ 2 0 cm)土壤颗粒中有机碳与重金属分布及其关系。这些土壤颗粒中有机碳和重金属元素 Pb、Cd的含量范围分别介于 7.5~ 1 5 g/ kg,1 1~ 2 0 mg/ kg和 2 0~ 70μg/ kg,且粒组间有显著差异。尽管所测组分的含量以 <0 .0 0 2 mm粒组中最高 ,但 2~ 0 .2 5 mm的粒组占其总量的 5 0 %左右 ,其次约 2 0 %存在于 0 .2 5~0 .0 2 mm粒组中。以土壤粒组中分量而言 ,有机碳和所测的重金属元素间有密切的依存关系。与荒地相比 ,植被恢复措施降低了各土层 2~ 0 .2 5 mm粒组中 Pb的含量和分量 ,但提高了 0~ 1 0 cm土层 Cd的含量和分量。在所研究的几种处理中 ,玉米 -包菜处理显著地促进了有机碳和重金属在各颗粒粒组中的均衡分布。因此 ,退化红壤植被恢复措施改变了土壤颗粒中有机碳和重金属的分布 ,因而可能影响着土壤环境中有机碳和重金属的形态及其活性。对于这些措...

采用原状土壤水稳性团聚体分离方法提取不同粒径的土壤颗粒 ,测定其有机碳及重金属元素 Pb、Cd的含量 ,研究了退化红壤在植被恢复下表层 (0~ 1 0 cm和 1 0~ 2 0 cm)土壤颗粒中有机碳与重金属分布及其关系。这些土壤颗粒中有机碳和重金属元素 Pb、Cd的含量范围分别介于 7.5~ 1 5 g/ kg,1 1~ 2 0 mg/ kg和 2 0~ 70μg/ kg,且粒组间有显著差异。尽管所测组分的含量以 <0 .0 0 2 mm粒组中最高 ,但 2~ 0 .2 5 mm的粒组占其总量的 5 0 %左右 ,其次约 2 0 %存在于 0 .2 5~0 .0 2 mm粒组中。以土壤粒组中分量而言 ,有机碳和所测的重金属元素间有密切的依存关系。与荒地相比 ,植被恢复措施降低了各土层 2~ 0 .2 5 mm粒组中 Pb的含量和分量 ,但提高了 0~ 1 0 cm土层 Cd的含量和分量。在所研究的几种处理中 ,玉米 -包菜处理显著地促进了有机碳和重金属在各颗粒粒组中的均衡分布。因此 ,退化红壤植被恢复措施改变了土壤颗粒中有机碳和重金属的分布 ,因而可能影响着土壤环境中有机碳和重金属的形态及其活性。对于这些措施下土壤环境中有机碳和重金属的生物有效性机制尚需进一步研究

Taking micro aggregation d < 0.25 ?mm in Pteridium aquilinum's producing area as dependent variable, and taking organic matter, total N, total P, total K, available N, available P, available K as independent variable, were analysed in terms of path analysis. The results showed: available P is main factor of positive effect, secondly available N and organic matter on mass fraction of micro aggregation d < 0.25 ?mm; Total P is main factor of negative effect, secondly total...

Taking micro aggregation d < 0.25 ?mm in Pteridium aquilinum's producing area as dependent variable, and taking organic matter, total N, total P, total K, available N, available P, available K as independent variable, were analysed in terms of path analysis. The results showed: available P is main factor of positive effect, secondly available N and organic matter on mass fraction of micro aggregation d < 0.25 ?mm; Total P is main factor of negative effect, secondly total K on mass fraction of micro aggregate d < 0.25 ?mm.

以野生蕨菜产地中d <0 .2 5mm的土壤微团聚体质量分数为依变量 ,以有机质、全氮、全磷、全钾、速效氮、速效磷、速效钾为自变量进行了通径分析 ,结果表明 :对d <0 .2 5mm土壤微团聚体质量分数有正效应的主要因子为速效磷 ,其次为速效氮和有机质 ;有负效应的主要因子为全磷 ,其次全钾

 
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