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OALib Journal期刊
ISSN: 2333-9721
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模拟升温和放牧对高寒草甸土壤微生物群落的影响
DOI: 10.3724/SP.J.1145.2011.00151, PP. 151-157
Keywords: 土壤微生物,群落结构,磷脂脂肪酸,模拟升温,气候变暖,放牧,牛粪,青藏高原,高寒草甸
Abstract:
通过开顶式温室（opentopchambers，otcs）升温以及刈割+施加牛粪处理，应用磷脂脂肪酸（phospholipidfattyacids，plfas）方法，研究了青藏高原东部高寒草甸土壤微生物群落结构对气候变暖和放牧的响应.结果表明，高寒草甸在生长季节，微生物群落以细菌为主.平均1.17℃的土壤升温使土壤微生物plfas总量增加34.58%，而春季割草结合牛粪施加使微生物plfas总量增加65.77%.模拟变暖和放牧均引起土壤微生物群落结构的显著变化.升温使细菌相对含量增加8.80%，而使真菌相对含量降低17.48%，细菌与真菌之比由7.3变为9.6.放牧使细菌相对含量增加8.40%，真菌相对含量降低14.04%，细菌与真菌之比由7.3变为9.2.otcs升温+放牧处理比单独的升温或放牧处理对土壤微生物总量和细菌与真菌比值的影响更加明显.本研究表明，气候变暖和人类活动能够在短期内显著地改变青藏高原高寒草甸土壤微生物群落结构，进而可能影响这一地区的生态系统碳收支和养分循环.图4表2参27
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