干旱区生态环境知识资源中心(Arid): 不同功能型原生荒漠植物对小降雨的光合响应

Arid

	不同功能型原生荒漠植物对小降雨的光合响应
其他题名	Photosynthetic responses of different plant functional types to small rainfall events in a non-disturbed desert
	吴玉; 郑新军; 李彦
来源期刊	生态学杂志
ISSN	1000-4890
出版年	2013
卷号	32 期号:10 页码:2591-2597
中文摘要	小降雨事件(≤5 mm)在干旱区年降雨频次中占很大比重,并且发生间隔较短。为揭示荒漠植物对小降雨的利用策略,在准噶尔盆地原始生境中研究了4种植物功能型(短生活史草本植物、长生活史草本植物、非潜水灌木和潜水灌木,共28物种)对1和6 mm人工降雨的光合响应。结果表明,1 mm降雨后,多数草本植物净光合速率(P_n)、气孔导度(g_s)上升,非潜水灌木的g_s和潜水灌木的瞬时水分利用效率(WUE)响应的幅度接近于6 mm降雨效应。为探讨植物利用小降雨的可能机制,选取单位面积叶片吸水量(LWUC)和叶片相对含水量增量(R_w)对叶片进行吸水能力测试。结果表明,小降雨既可通过叶面毛被草本植物直接吸收利用,也可通过增加微生境湿度,调节气孔导度,降低蒸腾而使灌木间接获益。
英文摘要	In arid areas, small rainfall (≤5 mm) events account for a large proportion of annual precipitation frequency, and occur in short time intervals. To elucidate the possible strategies of desert plants in utilizing small rainfall, this paper studied the photosynthetic responses of 28 plant species to simulated 1 and 6 mm rainfalls in Junggar Basin of Northwest China. For comparison, the 28 species were grouped into four plant functional types, i.e., herbaceous plants with short life cycle, herbaceous plants with long life cycle, non-phreatophyte shrubs, and phreatophyte shrubs. The results showed that after 1 mm rainfall, the net photosynthetic rate (P_n) and stomatal conductance (g_s) of most herbaceous plants increased, while the g_s of non-phreatophyte shrubs and the instantaneous water use efficiency (WUE) of phreatophyte shrubs had a response magnitude similar to that after 6 mm rainfall. In order to explore the possible mechanisms of small rainfall utilization, the leaf water uptake content (LWUC) and the percentage increase of leaf water content (R_w) were measured for assessing the leaf water uptake capacity of all the test species. The results revealed that most herbaceous plants with trichomes could directly absorb small rainfall, while shrubs could be indirectly benefited via increasing the humidity of microhabitat, regulating stomatal conductance, and reducing transpiration.
中文关键词	小降雨 ; 植物功能型 ; 叶面吸水 ; 叶面毛 ; 光合速率 ; 气孔导度
英文关键词	small rainfall plant functional type leaf water uptake trichomes photosynthetic rate stomatal conductance
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:4953304
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/230077
作者单位	中国科学院新疆生态与地理研究所, 荒漠与绿洲生态国家重点实验室, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	吴玉,郑新军,李彦. 不同功能型原生荒漠植物对小降雨的光合响应[J]. 中国科学院新疆生态与地理研究所,2013,32(10):2591-2597.
APA	吴玉,郑新军,&李彦.(2013).不同功能型原生荒漠植物对小降雨的光合响应.生态学杂志,32(10),2591-2597.
MLA	吴玉,et al."不同功能型原生荒漠植物对小降雨的光合响应".生态学杂志 32.10(2013):2591-2597.