A study has been carried out to examine the variation of microbial biomass and enzymic activity of different combinations offourtypesofsoil from Xuzhou area.
研究了徐州地区四种土壤在不同组合条件下，土壤微生物数量、土壤酶活性的变化情况。
2
According to the natural factors ofsoil formation and the development, degree ofsoil, under the influence of human production activity, the Huangmian soils were devided into fourtypes.
根据自然成土因素和在人为作用影响下的土壤熟化程度，将该小流域的黄绵土进一步划分为四种土壤类型。
3
In this paper, mathematical models ofsoil-water characteristic curve are studied and divided into fourtypes by the patterns of mathematical models.