气候变化领域集成服务门户(CCPortal): Seasonal Shift in Climatic Limiting Factors on Tree Transpiration: Evidence from Sap Flow Observations at Alpine Treelines in Southeast Tibet

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DOI	10.3389/fpls.2016.01018
	Seasonal Shift in Climatic Limiting Factors on Tree Transpiration: Evidence from Sap Flow Observations at Alpine Treelines in Southeast Tibet
	Liu, Xinsheng; Nie, Yuqin; Luo, Tianxiang; Yu, Jiehui; Shen, Wei; Zhang, Lin
通讯作者	Liu, XS (通讯作者)
发表日期	2016
ISSN	1664-462X
卷号	7
英文摘要	Alpine and northern treelines are primarily controlled by low temperatures. However, little is known about the impact of low soil temperature on tree transpiration at treelines. We aim to test the hypothesis that in cold-limited forests, the main limiting factors for tree transpiration switch from low soil temperature before summer solstice to atmospheric evaporative demand after summer solstice, which generally results in low transpiration in the early growing season. Sap flow, meteorological factors and predawn needle water potential were continuously monitored throughout one growing season across Smith fir (Abies georgei var. smithii) and juniper (Juniperus saltuaria) treelines in southeast Tibet. Sap flow started in early May and corresponded to a threshold mean air-temperature of 0 degrees C. Across tree species, transpiration was mainly limited by low soil temperature prior to the summer solstice but by vapor pressure deficit and solar radiation post-summer solstice, which was further confirmed on a daily scale. As a result, tree transpiration for both tree species was significantly reduced in the pre-summer solstice period as compared to post-summer solstice, resulting in a lower predawn needle water potential for Smith fir trees in the early growing season. Our data supported the hypothesis, suggesting that tree transpiration mainly responds to soil temperature variations in the early growing season. The results are important for understanding the hydrological response of cold-limited forest ecosystems to climate change.
关键词	PINUS-CANARIENSIS FOREST SOIL-TEMPERATURE SCOTS PINE WATER-USE SERGYEMLA MOUNTAINS CANOPY TRANSPIRATION NORWAY SPRUCE PHOTOSYNTHESIS TIMBERLINE CEMBRA
英文关键词	alpine treeline; transpiration; sap flow; soil temperature; southeast Tibet
语种	英语
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
WOS记录号	WOS:000379567000001
来源期刊	FRONTIERS IN PLANT SCIENCE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258690
推荐引用方式 GB/T 7714	Liu, Xinsheng,Nie, Yuqin,Luo, Tianxiang,et al. Seasonal Shift in Climatic Limiting Factors on Tree Transpiration: Evidence from Sap Flow Observations at Alpine Treelines in Southeast Tibet[J]. 中国科学院青藏高原研究所,2016,7.
APA	Liu, Xinsheng,Nie, Yuqin,Luo, Tianxiang,Yu, Jiehui,Shen, Wei,&Zhang, Lin.(2016).Seasonal Shift in Climatic Limiting Factors on Tree Transpiration: Evidence from Sap Flow Observations at Alpine Treelines in Southeast Tibet.FRONTIERS IN PLANT SCIENCE,7.
MLA	Liu, Xinsheng,et al."Seasonal Shift in Climatic Limiting Factors on Tree Transpiration: Evidence from Sap Flow Observations at Alpine Treelines in Southeast Tibet".FRONTIERS IN PLANT SCIENCE 7(2016).