Soil microbes can not only sustain the balance of decomposition and composition of soil organic matters, but also improve soil fertility by mineralizing the organic matters.
微生物不仅使土壤有机质的分解和合成处于相对平衡状态，而且可矿化有机物提高土壤肥力。
The composition of soil arthropod community in Beijing urban ecosystems was similar to that of its woodland ecosystems.
北京市土壤节肢动物群落组成与同地带森林生态系统土壤节肢动物群落组成基本相同。
Trace elements in soil of Tumotezuoqi were similar to the background levels of elemental composition of soil in the world.
土壤中微量元素的含量与世界土壤背景值相似。
There are three factors in the control of fitting remolded soil model: composition of soil body, stress history and consolidation.
土体材料的成分、应力历史及固化联结是重塑模型土拟合控制的三个方面。
The results showed that long term fertilization affected not only the content and composition of soil humus, but also the physicochemical property of the soil humus.
结果表明，长期施肥不仅影响土壤腐殖质的含量与组成，还影响腐殖质的理化性质。
The authors also try to improve grain composition of soil by replacing cement soil with some sand to reduce influence of environmental change to strength of cement improved soil.
本文还通过在改良土中置换一定比例的砂土来改善土料的颗粒级配，以降低循环失水对水泥土强度的影响。
The authors also try to improve grain composition of soil by replacing cement soil with some sand to reduce influence of environmental change to strength of cement improved soil.
本文还通过在改良土中置换一定比例的砂土来改善土料的颗粒级配，以降低循环失水对水泥土强度的影响。
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