藏北高原高寒草甸生态系统呼吸对增温的响应

doi:10.16258/j.cnki.1674-5906.2016.10.004

CORC > 北京大学 > 城市与环境学院

	藏北高原高寒草甸生态系统呼吸对增温的响应; Responses of Different Experimental Warming on Ecosystem Respiration in Tibetan Alpine Meadow
	李军祥 ; 曾辉 ; 朱军涛 ; 张扬建 ; 陈宁 ; 刘瑶杰
刊名	生态环境学报
	2016
关键词	高寒草甸生态系统呼吸实验增温响应藏北高原 alpine meadow ecosystem respiration experimental warming response Tibetan Plateau
DOI	10.16258/j.cnki.1674-5906.2016.10.004
英文摘要	生态系统呼吸（ER）作为生态系统最大的碳通量途径之一，其微小的波动都会引起大气中二氧化碳浓度的显著变化。本研究利用开顶箱（OTCs）式装置在藏北高原高寒草甸生态系统设置不同增温梯度实验，模拟未来增温2℃（T1）和增温4℃（T2）情景，探究增温对生态系统呼吸（ER）的影响。研究结果表明：（1）在2015整个生长季及生长季前期，模拟未来增温2℃和4℃均显著降低了ER（2015年整个生长季T1减少了ER为34%，T2减少了ER为31%；生长季前期T1减少了ER为35%，T2减少了ER为36%），但在生长季后期，模拟未来实验增温2℃显著降低ER（T1减少了34%），而模拟未来实验增温4℃没有显著改变ER；（2）回归分析结果表明，在整个2015年生长季及生长季前期，土壤水分是决定生态系统呼吸（ER）的关键因素，而生长季后期ER主要受土壤温度影响，因此在半干旱的高寒草甸生态系统中，土壤水分和土壤温度二者共同调节生态系统呼吸（ER）。研究结果表明，在干旱的生长季，未来增温可能会抑制高寒草甸生态系统的碳排放。; Ecosystem respiration (ER) is one of the largest terrestrial carbon fluxes, and thus small fluctuations in ER can lead to significant changes in atmospheric CO2 concentration. The field warming experiments with simulation of the future temperature increase of 2℃(T1) and 4 ℃(T2) using open top chambers (OTCs) were conducted in an alpine meadow on the Tibetan Plateau to study the effects of different experimental warming on ecosystem respiration (ER). The study results indicated that, (1) the ecosystem respiration for experimental warming T1 and T2 were significantly reduced in the whole growth-season and the early growth-season in 2015 (T1 reduced ER by 34%, T2 reduced ER by 31% in the growing season of 2015; T1 reduced ER by 35%, T2 decreased by 36%in early growth season), however, ecosystem respiration was significantly reduced to experimental warming T1 in the late growth- season (T1 reduced ER by 34%), while it was not significantly changed for experimental warming T2. (2) Results of regression analysis indicated that, the soil moisture is a critical factor in determining ecosystem respiration (ER) in the early growth-season in 2015, while soil temperature is a critical factor in determining ecosystem respiration (ER) in the late-growth season. Consequently, the incorporation of both soil moisture and soil temperature modulates the response of ecosystem respiration to warming in the ecosystem of semi-arid alpine meadow. Our study results predicted that, the future warming may reduce the carbon emissions of alpine meadow ecosystem in the drought growing season.; 国家重大科学研究计划项目(2013CB956302；2010CB950603)；国家自然科学基金面上项目(41571195)；中国科学院“西部之光”项目; 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 10; 1612-1620; 25
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/478025]
专题	城市与环境学院
推荐引用方式 GB/T 7714	李军祥,曾辉,朱军涛,等. 藏北高原高寒草甸生态系统呼吸对增温的响应, Responses of Different Experimental Warming on Ecosystem Respiration in Tibetan Alpine Meadow[J]. 生态环境学报,2016.
APA	李军祥,曾辉,朱军涛,张扬建,陈宁,&刘瑶杰.(2016).藏北高原高寒草甸生态系统呼吸对增温的响应.生态环境学报.
MLA	李军祥,et al."藏北高原高寒草甸生态系统呼吸对增温的响应".生态环境学报 (2016).