干旱区生态环境知识资源中心(Arid): 六道沟流域不同冠层小叶杨光合特性及水分利用效率研究

Arid

	六道沟流域不同冠层小叶杨光合特性及水分利用效率研究
其他题名	Water Use Efficiency and Photosynthetic Characteristics in Leaves of Populus simonii at Different Canopy Heights Grown in the Liudaogou Watershed
	魏特 1; 王力 2; 杨国敏 1
来源期刊	西北植物学报
ISSN	1000-4025
出版年	2017
卷号	37 期号:11 页码:2247-2255
中文摘要	小叶杨作为六道沟流域植被恢复的优势乔木速生树种,对该区的生态恢复与建设有着至关重要的作用。通过测定六道沟流域生长旺期(8和9月)不同冠层高度下小叶杨叶片的水势、光合气体交换参数、稳定性碳同位素比率(delta~(13) C)和叶片全N全P含量,分析了冠层叶片的delta~(13) C、光合特性指标、叶水势等在不同月份及冠层高度下的变化特征。结果表明:(1)小叶杨8、9月份间叶片光合特性指标净光合速率(P_n)、气孔导度(G_s)、胞间CO_2浓度(C_i)、蒸腾速率(T_r)均随着冠层高度增加而减小。(2)小叶杨叶片delta~(13) C和瞬时水分利用效率(WUEi)均随冠层高度增加而增加,delta~(13) C沿冠层高度的变化范围为-29.81~-27.43。(3)叶片delta~(13) C与植物的水分利用效率呈正相关关系,8月份和9月份delta~(13) C沿树高的变化幅度分别为2.22和2.12。研究发现,六道沟流域小叶杨叶片确实受到来自树高所引起的水分胁迫,叶片delta~(13) C能真实反映其长期的水分利用状况,且叶片delta~(13) C的变化是自身遗传特性与环境因子共同作用的结果。
英文摘要	Populus simonii,which is one of the dominant and fast-growing species in the Liudaogou watershed of China,plays a crucial role in the ecological restoration and construction of the area.However, there are few studies on the changes in photosynthetic parameters,water potential,delta~(13) C,the total nitrogen and total phosphorus variations along the tree height in this area.Consequently,we measured these indicators of the leaves at different months and canopy leaves,and analyzed the water use efficiency and photosynthetic characteristics of P.simonii’sleaves at different canopy heights.The results showed that: (1)the photosynthetic rate(P_n),stomatal conductance(G_s),intercellular CO_2 concentration(C_i)and transpiration rate(T_r)decreased with the increasing canopy height,indicating that the leaves were subjected to water stress caused by the tree height;(2)The values of delta~(13)C and instantaneous water use efficiency (WUEi)increased with the increasing canopy height,and thedelta~(13) C values ranged from -29.81 to -27.43along the canopy height;(3)Thedelta~(13) C values of the leaves were positively correlated with the water use efficiency of the plant,and they could reflect the long-term water use status.The variation range of delta~(13)C value was 2.22and 2.12along the tree height in different months,which suggested that genetic characteristics and environmental factors have common effects on leaf delta~(13)C.This research provides a theoretical basis for elucidating the area of P.simonii mechanism of the tree height of water stress,and for the construction and management of arid and semi arid region of P.simonii plantation.
中文关键词	小叶杨 ; 冠层高度 ; 水分利用效率 ; 光合参数 ; 水力限制假说
英文关键词	delta~(13) C Populus simonii canopy height delta~(13) C water use efficiency photosynthesis hydraulic limitation hypothesis
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:6133362
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236830
作者单位	1.西北农林科技大学资源环境学院, 杨陵, 陕西 712100, 中国; 2.西北农林科技大学资源环境学院, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨陵, 陕西 712100, 中国
推荐引用方式 GB/T 7714	魏特,王力,杨国敏. 六道沟流域不同冠层小叶杨光合特性及水分利用效率研究[J]. 西北农林科技大学,2017,37(11):2247-2255.
APA	魏特,王力,&杨国敏.(2017).六道沟流域不同冠层小叶杨光合特性及水分利用效率研究.西北植物学报,37(11),2247-2255.
MLA	魏特,et al."六道沟流域不同冠层小叶杨光合特性及水分利用效率研究".西北植物学报 37.11(2017):2247-2255.