放牧对克氏针茅(Stipa krylovii)草原土壤物理、化学及微生物性状的影响

doi:10.7522/j.issn.1000-694X.2015.00119

摘要/Abstract

摘要：

以内蒙古呼伦贝尔克氏针茅(Stipa krylovii)草原为对象,设置3个放牧梯度样地,对6-8月土壤理化性质及土壤微生物生物量的时空分异特征进行对比分析。结果表明:土壤容重、pH值、有效磷含量、微生物生物量氮随放牧强度的增大而增大。土壤含水率、有机质含量、全氮含量、微生物生物量碳随放牧强度的增大而减小,土壤全磷含量先增加后减小。在月动态上,土壤容重逐月增大;有机质含量、全磷含量、轻牧区pH、轻牧区和重牧区的土壤微生物碳含量随月变化而减小;轻牧区、重牧区8月和中牧区的6月土壤含水率均大于其他月份,中牧区土壤微生物碳逐月先减小后增加。在放牧影响下,土壤容重、含水率、pH值、微生物生物量碳含量存在着时空交互作用,进而影响土壤综合肥力。

关键词: 典型草原, 放牧强度, 月动态, 物理性状, 化学性状, 微生物性状

Abstract:

To investigate the influence of degradation on grassland, we set up three site of different grazing gradient in Stipa krylovii steppe of the Hulunbuir Kerulen basin in Northern China between June and August, and analyzed soil physical, chemical and biological properties of different grazing gradient and different month. The results showed that, on the different grazing intensity, the soil bulk density, pH, effective phosphorus, microbial biomass nitrogen increases with the increase of grazing intensity, soil moisture content, organic matter, total nitrogen and microbial biomass carbon decreases with increasing grazing intensity and soil total phosphorus grazing intensity increased first, then decreased. In monthly the dynamic, the soil bulk density increases with monthly dynamic. Organic matter, total phosphorus, pH of light grazing and microbial biomass carbon of light grazing and heavy grazing decreases with monthly dynamic. soil moisture content of light grazing and heavy grazing in August and soil moisture content of Moderate grazing in June are higher than others. Microbial biomass carbon of Moderate grazing decreased first, then increased with monthly dynamic. Under the influence of grazing, Soil bulk density, moisture content, pH and microbial biomass carbon content has the interaction of time and space. Then it has influence on the soil comprehensive fertility.

Key words: typical steppe, grazing gradient, monthly dynamic, physical properties, chemical properties, microbial properties

中图分类号:

S812.2

王晓朦, 乌云娜, 宋彦涛, 霍光伟, 徐志超, 道日娜. 放牧对克氏针茅(Stipa krylovii)草原土壤物理、化学及微生物性状的影响[J]. 中国沙漠, 2015, 35(5): 1193-1199.

Wang Xiaomeng, Wuyunna, Song Yantao, Huo Guangwei, Xu Zhichao, Daorina. Effects of Grazing on Soil Physical, Chemical and Biological Properties in the Stipa krylovii Steppe of Inner Mongolia[J]. JOURNAL OF DESERT RESEARCH, 2015, 35(5): 1193-1199.

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