川西高原季节性雪被覆盖下凋落物输入对土壤微生物数量及生物量的影响

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摘要

为了了解季节性雪被覆盖下不同碳供应水平对高山土壤生态系统过程的影响,2010 年1 月-5 月在青藏高原东缘设计人工雪厚度梯度控制(0 cm, 30 cm, 100 cm)和凋落物添加(0 g, 5 g, 20 g 鲜卑花叶片)的原位试验,测定了土壤中的微生物数量和微生物生物量。研究发现,雪被覆盖能有效地绝缘大气和土壤,减少冻融交替的幅度和频次,显著增加了细菌和真菌数量,而对微生物生物量碳氮无明显影响。凋落物的输入降低了微生物生物量氮的含量,增加了细菌和真菌的数量。说明雪被覆盖和有机碳的输入可以通过影响冬季土壤微生物群落结构,从而对高山地区冬季生态系统过程产生实质性的影响。

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	胡霞
	吴宁
	尹鹏
	吴彦

关键词 ：雪被覆盖, 凋落物添加, 细菌数量, 真菌数量, 微生物量碳氮

Abstract：

To understand the effects of snow-cover and organic carbon input on the alpine soil ecosystem processes, intact soil core incubations in three different snow regimes (0, 30 and 100 cm depth) and litter input (0, 5 and 20g Sibiraea angustata leaf litter) were used to measure the microbial count and biomass in the eastern Tibetan Plateau from January to May 2010. The result showed that snow-cover could effectively isolate atmosphere and soil, reduce the amplitude and frequency of frozen-thawing events, and increase significantly bacteria and fungi count, while did not influence microbial biomass carbon and nitrogen. Litter input increased microbial count, while decreased microbial nitrogen content. The results indicated that snow-cover and organic carbon input impact directly soil microbial community in winter, and then affect the ecosystem processes in alpine zone.

Key words： snowpack litter input bacteria count fungi count microbial biomass carbon and nitrogen

收稿日期: 2013-06-25

S154.38

基金资助:中国科学院战略性先导科技专项(XDA05050404);“十二五”国家科技支撑计划项目(2011BAC09B04-02-03);国家自然科学基金(40971178);乐山师范学院科研项目(Z1263);四川省国际合作项目(2011HH0011)。

引用本文:

胡霞, 吴宁, 尹鹏, 吴彦*. 川西高原季节性雪被覆盖下凋落物输入对土壤微生物数量及生物量的影响[J]. , 2013, 32(3): 359-364.
HU Xia, WU Ning, YIN Peng, WU Yan*. Effects of snowpack and litter input on soil microbial count and biomass in the Eastern Tibetan Plateau. , 2013, 32(3): 359-364.

链接本文:

http://www.ecolsci.com/CN/Y2013/V32/I3/359

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