蚯蚓类中微生物群落活性对土壤团粒结构可起重要作用。
Microfloral activity in worm may have an important effect on soil crumb structure.
可改善土壤物理特征，改良土壤团粒结构，减少土壤密实性。
Can Improve the soil physical characteristics, soil aggregate structure, reduce soil compactness.
而增施有机肥可以改善土壤的团粒结构和理化性质，更有利于水肥的耦合作用。
More organic fertilizer can not only improve soil aggregates structure and basic character, but also be propitious to the effect of water and soil coupling.
秸秆覆盖还田促进土壤团粒结构形成，提高了土壤水稳性团聚体含量，从而改善了土壤通透性和保水保肥性。
Straw mulched could improve soil granular structure, and increase the content of water-stable aggregates, so the ability of permeability, fertilizer and water conservation got improved.
结果表明，合成的淀粉接枝共聚物符合预期结构，未糊化的淀粉接枝后，聚合物保持团粒结构，表面接枝上了乙烯基均聚物；
After the graft reaction of ungelatinized starch, the morphology of the copolymers kept the aggregate structure of starch, and vinyl copolymer is grafted on its surface;
采用在实验室培养和用淋洗管模拟田间淋洗的方法研究聚丙烯酰胺对沙土水稳性团粒结构改良作用，对氮、磷、钾养分保肥的作用以及其合理施用量。
This paper study on the effects of PAM on improving water stable aggregate and reducing nutrients loss from sandy soil, methods of Laboratory incubation and leaching were adopted.
采用在实验室培养和用淋洗管模拟田间淋洗的方法研究聚丙烯酰胺对沙土水稳性团粒结构改良作用，对氮、磷、钾养分保肥的作用以及其合理施用量。
This paper study on the effects of PAM on improving water stable aggregate and reducing nutrients loss from sandy soil, methods of Laboratory incubation and leaching were adopted.
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