干旱区生态环境知识资源中心(Arid): 浑善达克沙地不同植物功能型光合作用和水分利用特征的比较

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	浑善达克沙地不同植物功能型光合作用和水分利用特征的比较
其他题名	Comparison of photosynthesis and water use efficiency between three plant functional types in Hunshandak sandland
	牛书丽; 蒋高明; 高雷鸣; 李永庚; 姜闯道; 刘美珍; 崔红霞; 丁莉; 彭羽
来源期刊	生态学报
ISSN	1000-0933
出版年	2005
卷号	25 期号:4 页码:699-704
中文摘要	为了比较不同植物功能型在沙地生境下光合作用和水分利用效率的差异,测定了浑善达克沙地3种功能型的代表种的气体交换特征来比较它们的光合碳固定能力和水分利用状况.3个代表种的气体交换日变化结果表明乔木的光合速率和水分利用效率比草本和灌木的低,而蒸腾速率和气孔导度较高,经过中午的光合午休后,乔木的光合速率在下午没有恢复,而草本和灌木都有不同程度的恢复.在所测定的所有代表物种中,研究地全部的乔木(3种)和灌木(6种)以及典型的草本(25种),气孔导度与光合速率和蒸腾速率都成显著的正相关关系;另外,在同样的叶片水势情况下,乔木植物的气孔导度最低,在同样的蒸腾速率情况下,乔木植物的光合速率最低.这些结果表明乔木在CO2同化和H2O蒸腾平衡上具有低的水分利用效率.从这个角度考虑,我们认为在对沙地进行恢复时,一些草本和灌木种比乔木更合适.
英文摘要	Stomata controls carbon-water balance in plants by acting as transport for diffusive CO2 uptake and water vapor loss.Plants with lower photosynthesis and higher transpiration rate may function with less stomatal control and inefficient water usage. To test the hypothesis that tree is improper for the purpose of degraded land restoration in arid or semi-arid environment, we investigated gas exchanges of three plant functional types (PFTs) (3 tree species, 6 shrub species and 25 herb species) in Hunshandak Sandland, China, to compare their carbon assimilation ability and water use efficiency. Our research aimed to look into how those plants with different PFTs design carbon and water cycling in semi-arid areas in order to select the ecologically and economically suitable species for the seek of controlling of sandland degradation.We investigated the typical species of each PFT, I.e. Ulmus pumila (tree), Salix gordejevii (shrub) and Leymus chinensis(herb) to compare their diurnal gas exchange changes. The results showed that trees had significantly lower photosynthetic rates (A) and water use efficiency (WUE), but higher transpiration rate (E) and stomatal conductance (gs), compared with herbs and shrubs. Tree species decreased their A, E and gs all along from the maximal values in the morning and could not recover in the afternoon, while shrubs and herbs reopened their gs after the midday depression. The diurnal changes of gs indicated the less stomatal flexibility of stomata in trees than herbs and shrubs.Furthermore, all the trees (3 species), shrubs (6 species) and the dominant herbs (25 species) were compared for the stomatal control and water use efficiency among PFTs. Among all the species with different PFTs, there were significantly positive correlations between gs and A and E. However, tree species displayed lower A but higher E than shrubs and herbs at the same stomatal conductance, indicating that tree species assimilate less CO2 and transpire more water per unit gs, Lower photosynthetic capacity and larger transpiration rate induced less water use efficiency in trees than in shrubs and herbs. In addition, gs in trees were more possible to suffer from the drought as reflected by the sensitivity of gs to varied leaf water potential. These results might suggest that trees had poor stomatal regulation in controlling carbon-water balance and more sensitive to drought which was common in Hunshandak Sandland. From this study, we recommend that some native herbs,such as Leymus chinensis and Agriophyllum squarrosum and shrubs, like Salix matsudana Koidz, Salix gordejevii L. , rather than trees should be selected for the sandland restoration.
中文关键词	浑善达克沙地 ; 气体交换 ; 植物功能型 ; 气孔调节 ; 水分利用效率
英文关键词	Hunshandak sandland gas exchange plant functional types stomatal regulation water use efficiency
语种	英语
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:2026513
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/206519
作者单位	Institute of Botany, Chinese Academy of Sciences, Laboratory of Quanitiative Vegetation Ecology,, Beijing 100093, China
推荐引用方式 GB/T 7714	牛书丽,蒋高明,高雷鸣,等. 浑善达克沙地不同植物功能型光合作用和水分利用特征的比较[J],2005,25(4):699-704.
APA	牛书丽.,蒋高明.,高雷鸣.,李永庚.,姜闯道.,...&彭羽.(2005).浑善达克沙地不同植物功能型光合作用和水分利用特征的比较.生态学报,25(4),699-704.
MLA	牛书丽,et al."浑善达克沙地不同植物功能型光合作用和水分利用特征的比较".生态学报 25.4(2005):699-704.