Dynamic and complex microclimate responses to warming and grazing manipulations

NWIPB OpenIR

	Dynamic and complex microclimate responses to warming and grazing manipulations
	Klein, JA ; Harte, J ; Zhao, XQ
	2005-09-01
发表期刊	GLOBAL CHANGE BIOLOGY ; Klein Julia A, Harte John, Zhao Xinquan.Dynamic and complex microclimate responses to warming and grazing manipulations.GLOBAL CHANGE BIOLOGY,2005,11(9):1440-1451
摘要	Synthesis efforts that identify patterns of ecosystem response to a suite of warming manipulations can make important contributions to climate change science. However, cross-study comparisons are impeded by the paucity of detailed analyses of how passive warming and other manipulations affect microclimate. Here we document the independent and combined effects of a common passive warming manipulation, open-top chambers (OTCs), and a simulated widespread land use, clipping, on microclimate on the Tibetan Plateau. OTCs consistently elevated growing season averaged mean daily air temperature by 1.0-2.0 degrees C, maximum daily air temperature by 2.1-7.3 degrees C and the diurnal air temperature range by 1.9-6.5 degrees C, with mixed effects on minimum daily air temperature, and mean daily soil temperature and moisture. These OTC effects on microclimate differ from reported effects of a common active warming method, infrared heating, which has more consistent effects on soil than on air temperature. There were significant interannual and intragrowing season differences in OTC effects on microclimate. For example, while OTCs had mixed effects on growing season averaged soil temperatures, OTCs consistently elevated soil temperature by approximately 1.0 degrees C early in the growing season. Nonadditive interactions between OTCs and clipping were also present: OTCs in clipped plots generally elevated air and soil temperatures more than OTCs in nonclipped plots. Moreover, site factors dynamically interacted with microclimate and with the efficacy of the OTC manipulations.These findings highlight the need to understand differential microclimate effects between warming methods, within warming method across ecosystem sites, within warming method crossed with other treatments, and within sites over various timescales. Methods, sites and scales are potential explanatory variables and covariables in climate warming experiments. Consideration of this variability among and between experimental warming studies will lead to greater understanding and better prediction of ecosystem response to anthropogenic climate warming.; Synthesis efforts that identify patterns of ecosystem response to a suite of warming manipulations can make important contributions to climate change science. However, cross-study comparisons are impeded by the paucity of detailed analyses of how passive warming and other manipulations affect microclimate. Here we document the independent and combined effects of a common passive warming manipulation, open-top chambers (OTCs), and a simulated widespread land use, clipping, on microclimate on the Tibetan Plateau. OTCs consistently elevated growing season averaged mean daily air temperature by 1.0-2.0 degrees C, maximum daily air temperature by 2.1-7.3 degrees C and the diurnal air temperature range by 1.9-6.5 degrees C, with mixed effects on minimum daily air temperature, and mean daily soil temperature and moisture. These OTC effects on microclimate differ from reported effects of a common active warming method, infrared heating, which has more consistent effects on soil than on air temperature. There were significant interannual and intragrowing season differences in OTC effects on microclimate. For example, while OTCs had mixed effects on growing season averaged soil temperatures, OTCs consistently elevated soil temperature by approximately 1.0 degrees C early in the growing season. Nonadditive interactions between OTCs and clipping were also present: OTCs in clipped plots generally elevated air and soil temperatures more than OTCs in nonclipped plots. Moreover, site factors dynamically interacted with microclimate and with the efficacy of the OTC manipulations.
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/45758
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Klein, JA,Harte, J,Zhao, XQ. Dynamic and complex microclimate responses to warming and grazing manipulations[J]. GLOBAL CHANGE BIOLOGY, Klein Julia A, Harte John, Zhao Xinquan.Dynamic and complex microclimate responses to warming and grazing manipulations.GLOBAL CHANGE BIOLOGY,2005,11(9):1440-1451,2005.
APA	Klein, JA,Harte, J,&Zhao, XQ.(2005).Dynamic and complex microclimate responses to warming and grazing manipulations.GLOBAL CHANGE BIOLOGY.
MLA	Klein, JA,et al."Dynamic and complex microclimate responses to warming and grazing manipulations".GLOBAL CHANGE BIOLOGY (2005).