干旱区生态环境知识资源中心(Arid): 水分条件对红砂叶片碳同位素组成与光合特性和分枝生长的影响

Arid

	水分条件对红砂叶片碳同位素组成与光合特性和分枝生长的影响
其他题名	Effect of Water Conditions on Carbon Isotope Composition,Photosynthesis and Branch Growth of Reaumuria soongorica
	潘佳; 李荣; 胡小文
来源期刊	西北植物学报
ISSN	1000-4025
出版年	2016
卷号	36 期号:6 页码:1190-1198
中文摘要	在盆栽条件下,研究了不同水分处理对红砂(Reaumuria soongorica)叶碳同位素组成、光合特性和分枝生长的影响,并进一步调查了自然条件下不同退化程度红砂草地的土壤含水量,分枝生长、叶碳同位素及其关系。结果表明:(1)在盆栽条件下,随土壤含水量的降低,红砂当年生分枝生物量、一级分枝长、二级分枝数及其叶片净光合速率、气孔导度和蒸腾速率均显著减小,而叶片碳同位素组成( delta~(13)C)和水分利用效率则随土壤含水量降低而显著增加;且叶片 delta~(13)C与当年生分枝生物量、一级分枝长、二级分枝数、叶片净光合速率、气孔导度和蒸腾速率呈显著负相关关系。(2)在田间自然条件下,红砂叶片 delta~(13)C与立地30~60cm及60~100cm土层的土壤含水量、单位冠幅面积生物量、单位冠幅面积分枝数呈显著负相关关系。研究认为,在盆栽和田间条件下,红砂叶片 delta~(13)C是指示其生境水分状况的良好指标;红砂主要利用土壤的深层水分,其在土壤含水量相对较低的轻度退化区水分利用效率比土壤含水量相对较高的重度退化区更高。这一结论对于理解干旱生境中红砂的水分利用策略以及红砂草地的管理和恢复具有一定的指导意义。
英文摘要	Present study determined the effect of soil moisture condition on leaf carbon isotope composition (delta~(13)C),photosynthesis and current year branch growth of Reaumuria soongorica in the pot experiment. The branch growth and delta~(13)C of R.soongorica growing in different degraded area were investigated,and their relationship with soil moisture content that plant stand were analyzed.The results showed that:(1) The current year branch biomass(DM),length of first grade branches(LFG),number of second grade branches(NSG),net photosynthesis rate(P_n),stomatal conductance(G_s)and transpiration rate(T_r) of R.soongorica were largely reduced as water supplies decreased in the pot experiments.delta~(13)C and water use efficiency(WUE)increased as water supplies reduced,and a significant negative correlation was observed between delta~(13)C and DM,LFG,NSG,P_n,G_s and T_r.(2)In the field,delta~(13)C decreased from light degraded sites to severe degraded one and significantly negatively correlated with soil water content at a depth of 30-60 cm and 60-100cm.A negative relationship was also observed between delta~(13)C and biomass per unit canopy area(BCA)and number of first grade branch per unit canopy area(NCA).These results suggested that delta~(13)C is a good indicator of R.soongoricaresponse to water stress both under potted and field conditions and R.soongorica mainly utilize water in deeper soil and utilize water more efficiently in light degraded area than that in severe degraded area.This conclusion may improve understanding water use strategies of R.soongoricain the arid environments,and have practical use in grassland management and restoration.
中文关键词	红砂 ; 碳同位素组成 ; 干旱胁迫 ; 光合特性 ; 水分利用效率
英文关键词	Reaumuria soongorica carbon isotope composition drought stress photosynthesis water use efficiency
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:5752933
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235156
作者单位	兰州大学草地农业科技学院, 草地农业生态系统国家重点实验室, 兰州, 甘肃 730020, 中国
推荐引用方式 GB/T 7714	潘佳,李荣,胡小文. 水分条件对红砂叶片碳同位素组成与光合特性和分枝生长的影响[J]. 兰州大学,2016,36(6):1190-1198.
APA	潘佳,李荣,&胡小文.(2016).水分条件对红砂叶片碳同位素组成与光合特性和分枝生长的影响.西北植物学报,36(6),1190-1198.
MLA	潘佳,et al."水分条件对红砂叶片碳同位素组成与光合特性和分枝生长的影响".西北植物学报 36.6(2016):1190-1198.