干旱区生态环境知识资源中心(Arid): Effects of soil water and nitrogen availability on photosynthesis and water use efficiency of Robinia pseudoacacia seedlings

Arid

	Effects of soil water and nitrogen availability on photosynthesis and water use efficiency of Robinia pseudoacacia seedlings
	Liu Xiping; Fan Yangyang; Long Junxia; Wei Ruifeng; Kjelgren Roger; Gong Chunmei; Zhao Jun
来源期刊	Journal of Environmental Sciences
ISSN	1001-0742
出版年	2013
卷号	25 期号:3 页码:585-595
英文摘要	The efficient use of water and nitrogen (N) to promote growth and increase yield of fruit trees and crops is well studied.However,little is known about their effects on woody plants growing in arid and semiarid areas with limited water and N availability.To examine the effects of water and N supply on early growth and water use efficiency (WUE) of trees on dry soils,one-year-old seedlings of Robinia pseudoacacia were exposed to three soil water contents (non-limiting,medium drought,and severe drought) as well as to low and high N levels,for four months.Photosynthetic parameters,leaf instantaneous WUE (WUEi) and whole tree WUE (WUEb) were determined.Results showed that,independent of N levels,increasing soil water content enhanced the tree transpiration rate (Tr),stomatal conductance (Gs),intercellular CO2 concentration (Ci),maximum net assimilation rate (Amax),apparent quantum yield (AQY),the range of photosynthetically active radiation (PAR) due to both reduced light compensation point and enhanced light saturation point,and dark respiration rate (Rd),resulting in a higher net photosynthetic rate (Pn) and a significantly increased whole tree biomass.Consequently,WUEi and WUEb were reduced at low N,whereas WUE i was enhanced at high N levels.Irrespective of soil water availability,N supply enhanced Pn in association with an increase of Gs and Ci and a decrease of the stomatal limitation value (Ls),while Tr remained unchanged.Biomass and WUEi increased under non-limiting water conditions and medium drought,as well as WUEb under all water conditions;but under severe drought,WUEi and biomass were not affected by N application.In conclusion,increasing soil water availability improves photosynthetic capacity and biomass accumulation under low and high N levels,but its effects on WUE vary with soil N levels.N supply increased Pn and WUE,but under severe drought,N supply did not enhance WUEi and biomass.
英文关键词	drought nitrogen photosynthesis water use efficiency Robinia pseudoacacia
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:4776003
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335191
作者单位	Liu Xiping, Department of Plant Physiology, College of Life Science, Northwest A&F University, Yangling, Shaanxi 712100, China.; Fan Yangyang, Department of Plant Physiology, College of Life Science, Northwest A&F University, Yangling, Shaanxi 712100, China.; Long Junxia, Department of Plant Physiology, College of Life Science, Northwest A&F University, Yangling, Shaanxi 712100, China.; Wei Ruifeng, Department of Plant Physiology, College of Life Science, Northwest A&F University, Yangling, Shaanxi 712100, China.; Gong Chunmei, Department of Plant Physiology, College of Life Science, Northwest A&F University, Yangling, Shaanxi 712100, China.; Zhao Jun, Department of Plant Physiology, College of Life Science, Northwest A&F University, Yangling, Shaanxi 712100, China.; Kjelgren Roger, Department of Plants,Soils and Climate,College of Agriculture,Utah State University, Logan, 84322, USA.
推荐引用方式 GB/T 7714	Liu Xiping,Fan Yangyang,Long Junxia,et al. Effects of soil water and nitrogen availability on photosynthesis and water use efficiency of Robinia pseudoacacia seedlings[J],2013,25(3):585-595.
APA	Liu Xiping.,Fan Yangyang.,Long Junxia.,Wei Ruifeng.,Kjelgren Roger.,...&Zhao Jun.(2013).Effects of soil water and nitrogen availability on photosynthesis and water use efficiency of Robinia pseudoacacia seedlings.Journal of Environmental Sciences,25(3),585-595.
MLA	Liu Xiping,et al."Effects of soil water and nitrogen availability on photosynthesis and water use efficiency of Robinia pseudoacacia seedlings".Journal of Environmental Sciences 25.3(2013):585-595.