导致草坪凹陷、坑洼的因素是多方面的，有土壤土质因素、施工技术因素以及其他因素，如不可抗力和人为因素等，其中土壤土质因素为主要和直接因素。
Many factors can cause lawn hollow and hole, such as soil terrene, construction technology or force majeure and man-made factors, in which soil terrene is the main and direct factor.
通过对不同肥力水平黑土、棕壤、黄棕壤、红壤土壤微生物量碳氮的比较，研究和探讨土壤微生物量碳氮与土壤肥力的关系。
To find out the relationship between soil microbial biomass C and N and soil fertility, soil microbial biomass C and N were compared in several types of soil with different fertilization levels.
结果显示：(1)随着群落的发育，土壤质地由群落发育中期的粉土逐渐过渡到发育后期、末期的粘壤土，土壤质地得到了明显的改善。
The result showed: (1) With the development of community, soil texture changed from silt to clay loam, soil texture was improved obviously.
因土壤土质因素出现的土壤沉降速率、收缩程度和方向的不同是导致草坪凹陷、坑洼的主要原因。
The difference of sedimentation speed, shrinkage degree and direction is the main factor of lawn hollow and hole.
壤土的土壤密度、比重降低，而砂土的土壤密度、比重增高。
Soil density and soil particle of the loam are decreased but those of the sand are increased.
壤土的土壤密度、比重降低，而砂土的土壤密度、比重增高。
Soil density and soil particle of the loam are decreased but those of the sand are increased.
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