Plant production, and carbon and nitrogen source pools, are strongly intensified by experimental warming in alpine ecosystems in the Qinghai-Tibet Plateau
Plant production, and carbon and nitrogen source pools, are strongly intensified by experimental warming in alpine ecosystems in the Qinghai-Tibet Plateau
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DOI：
10.1016/j.soilbio.2011.01.009
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发表时间：
2011-05-01
影响因子：
9.7
通讯作者：
Liu Guangsheng
中科院分区：
文献类型：
--
作者：
Li Na;Wang Genxu;Liu Guangsheng
在不同的温度标高下，利用开放式顶室（OTCs）被动地提高了空气和上层土壤的温度。我们分析了空气和土壤温度，土壤湿度。2年变暖后的生物量、微生物生物量和养分动态。使用otc明显提高了温度，降低了土壤水分。2个草甸的地上部植物和根系生物量均增加。温度的小幅升高导致沼泽草甸成为净碳汇，高寒草甸成为净碳源，而进一步升温至少在短期内加剧了这一过程。总体而言，峰火山地区高寒生态系统是碳源。(C) 2011 Elsevier Ltd.版权所有。
The aim of this study was to assess initial effects of warming on the nutrient pools of carbon and nitrogen of two most widespread ecosystem types, swamp meadow and alpine meadow, in the Qinghai-Tibet Plateau, China. The temperature of the air and upper-soil layer was passively increased using open-top chambers (OTCs) with two different temperature elevations. We analyzed air and soil temperature, soil moisture. biomass, microbial biomass, and nutrient dynamics after 2 years of warming. The use of OTCs clearly raised temperature and decreased soil moisture. The aboveground plant and root biomass increased in all OTCs in two meadows. A small temperature increase in OTCs resulted in swamp meadow acting as a net carbon sink and alpine meadow as a net source, and further warming intensified this processes, at least in a short term. On balance, the alpine ecosystems in the Fenghuoshan region acted as a carbon source. (C) 2011 Elsevier Ltd. All rights reserved.