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	The Limiting Effect of Deep Soil Water on Evapotranspiration of a Subtropical Coniferous Plantation Subjected to Seasonal Drought
	Tang Y. K. ; Wen X. F. ; Sun X. M. ; Zhang X. Y. ; Wang H. M.
	2014
关键词	ChinaFLUX evapotranspiration seasonal drought subtropical coniferous plantation net ecosystem exchange temperate deciduous forest carbon-dioxide exchange energy fluxes heat fluxes rain-forest co2 fluxes grassland variability dynamics
英文摘要	Seasonal drought is a common occurrence in humid climates. The year 2003 was the driest year during the period 19852011 in southeastern China. The objective of this study was to elucidate the impact of the exceptional drought in 2003, compared with eddy flux measurements during 2004-11, on the dynamics of evapotranspiration (ET) and related factors, as well as their underlying mechanisms, in a subtropical coniferous plantation in southeastern China. It was found that daily ET decreased from 5.34 to 1.84 mm during the intensive drought period and recovered to 4.80 mm during the subsquent recovering drought period. Path analysis indicated that ET was mainly determined by canopy conductance and deep soil water content (50 cm) during the intensive drought and recovering drought periods, respectively. The canopy conductance offset the positive effect of air vapor pressure deficit on ET when suffering drought stress, while the canopy conductance enhanced the positive effect of air temperature on ET during the late growing season. Because the fine roots of this plantation are mainly distributed in shallow soil, and the soil water in the upper 40 cm did not satisfy the demand for ET, stomatal closure and defoliation were evident as physiological responses to drought stress.
出处	Advances in Atmospheric Sciences
卷	31
期	2
页	385-395
收录类别	SCI
语种	英语
ISSN号	0256-1530
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/29589]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Tang Y. K.,Wen X. F.,Sun X. M.,et al. The Limiting Effect of Deep Soil Water on Evapotranspiration of a Subtropical Coniferous Plantation Subjected to Seasonal Drought. 2014.

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