摘要
以东祁连山珠芽蓼草地、禾草草地和嵩草草地为样点,对土壤微生物量和酶的季节动态进行了研究.结果表明,土壤微生物量碳随季节呈先升高后降低再升高的趋势,7月达最大值（P＜0.05）,9月下降至最小值（P＜0.05）,但土壤微生物量氮、磷的季节变化略有不同.土壤微生物量碳、氮与土壤有机碳和全氮比率分别为0.16％～0.84％和0.48％～2.03％,其季节变化与微生物量碳、氮基本一致.土壤微生物量碳氮比、碳磷比和氮磷比分别为3.19～20.55、4.38～49.74和1.11～3.56,碳氮比最大值出现在7月,最小值在5月.土壤酶活性也呈季节性变化,土壤脲酶和中性磷酸酶的季节动态不一致.
The soil microbial biomass and enzymatic activities in Polygonum viviparum alpine grass- land（PG） ,grass alpine grassland（GG） and Kobresia capillifolia alpine grassland（KG） in the Eastern Qil- Jan Mountains in the Qinghai-Tibetan Plateau, China were studied. The results showed that the microbial biomass carbon （MBC） increased first, then decreased and increased with seasons, maximum value ap- peared in July and the minimum in September. However, the seasonal dynamics of microbial biomass ni- trogen （MBN） and the microbial biomass phosphorus （MBP） was different. The ratios of MBC/SOM and MBN/STN were 0.16%-0.84% and 0.48% - 2.03%, respectively. Their seasonally dynamics showed a similar trend to the MBC and MBN. The ratios of MBC/MBN, MBC/MBP and MBN/MBP were 3.19 20.55, 4.38 - 49.74 and 1.11 - 3.56, respectively. The maximum of MBC/MBN occurred in July and the minimum in September. The enzyme activities in soil showed seasonal change, maximal unease activity in soil of Polygonum viviparum alpine grassland and Kobresia capillifolia alpine grassland occurred in September, grassland in July. The neutral phosphatase activities （NPA） in soil of Polygonum viviparum alpine grassland decreased from May to July, increased from July to September, and then gradually de- creased after September. However, the neutral phosphatase activities in soil of grass land and Kobresia capillifolia alpine grassland firstly decreased from May to July or September, and then increased again.
出处
《中国草地学报》
CSCD
北大核心
2014年第2期78-84,共7页
Chinese Journal of Grassland
基金
国家自然科学基金项目(No.31160122)
草业生态系统教育部重点实验室(甘肃农业大学)开放课题项目(No.CYzs-2011011)
关键词
东祁连山
高寒草本草地
土壤微生物量
土壤酶
季节动态
Eastern Qilian Mountains
Alpine grassland
Soil microbial biomass
Enzymatic activity
Seasonal dynamics
