摘要
通过对三种退化程度不同的草地土壤农化性状与微生物区系进行研究，结果表明，草地退化后，其土壤肥力水平、土壤微生物数量和微生物种类有随退化程度增高而下降（减少）的趋势；退化草地存在不同程度的营养元素比例失调，表现为少氮、缺磷、富钾和高有机质含量，且退化程度接近的草地间，在土壤微生物区系和农化性状有部分类似的特征。
The soil agrochemical properties and microbiota of three degraded grasslands (Kobresia pygmaea meadow, Dasiphora fruticosa shrub and Festuca sinensis grassland)were studied. The main results are summarized as flliows:(1) There existed obvious vertical distribution of the contents of N, P, K, organic matters and pH value as well as microorganism numbers in the soils. Soil agrochemical properties were significantly correlated with soil microorganism numbers.(2) Soil fertility and the numbers of soil microorganisms, decreased with grassland degradation. (3) N and P were deficient but K and organic matter were rich in soils of the three degraded grasslands. And (4) The soil microbiota varied obviously with grassland degradation. Weakly degraded grassland had more soil microorganism genera than the strongly degraded one, and the microbiota were similar in the grasslands with the similar degradation degrees.
出处
《土壤学报》
CAS
CSCD
北大核心
1996年第2期192-200,共9页
Acta Pedologica Sinica
关键词
退化草地
土壤农化性状
微生物区系
草地
Degraded grassland
Soil microbiota
Soil agrochemical properties
