干旱区生态环境知识资源中心(Arid): 不同水分条件下苔藓结皮光合能力对氮素添加量的响应

Arid

	不同水分条件下苔藓结皮光合能力对氮素添加量的响应
其他题名	Responses of Bryophytes’ Photosynthesis to Nitrogen Addition Under Different Water Content
	闫佳毅; 张宇清; 秦树高; 吴斌; 冯薇; 邵晨曦; 法科宇
来源期刊	水土保持通报
ISSN	1000-288X
出版年	2015
卷号	35 期号:6 页码:75-80
中文摘要	[目的]探究苔藓结皮失水过程中光合能力对不同梯度氮添加的响应,为进一步研究苔藓结皮对氮沉降的响应过程以及为干旱、半干旱区荒漠生态系统的管理提供理论依据。[方法]选取毛乌素沙地的优势藓种拟双色真藓(Bryum pachytheca)为研究对象,在控制条件下采用氮添加的模拟试验手段。[结果]苔藓结皮净光合速率在低于0.2 g/(m~2·a)的氮添加量时受到促进,在高于0.2 g/(m~2·a)的氮素添加量下,低水分含量时被抑制,高水分含量时会受促进;同时,0.2 g/(m~2·a)是苔藓结皮能承受的最优氮添加量,此时苔藓结皮的光合固碳能力达到最大,年光合固碳量为对照条件的2倍。[结论]氮沉降引起的氮素增加对于干旱、半干旱区苔藓结皮的光合能力以及固碳潜力具有显著的影响。
英文摘要	The responses of bryophytes’ photosynthesis to nitrogen addition in the process of its dehydration were studied in order to demonstrate how it will respond to nitrogen deposition and to provide relevant theoretical knowledge for management of desert ecosystems in arid or semi-arid region. [Methods] The dominant bryophytes, Bryum pachytheca in Mu Us desert was selected to examine the responses of bryophytes’ photosynthesis to nitrogen addition with eight levels. [Results] The net photosynthetic rates of bryophytes(P_n) increased when nitrogen addition was less than 0.2 g/(m~2·a). When nitrogen addition was over 0.2 g/(m~2·a), the responses of P_n varied under different water condition. It was enhanced under high levels of water content, and was suppressed under low levels. In terms of bryophytes’ photosynthetic carbon sequestration capacity in tested site, the optimal adding amount of nitrogen was 0.2 g/(m~2·a). At this addition amount, carbon fixed by bryophytes’ photosynthesis was doubled as compared with that without adding nitrogen. [Conclusion] Nitrogen increment from deposition can strongly influence photosynthesis and carbon sequestration capacity of bryophytes in arid and semi-arid regions.
中文关键词	苔藓结皮 ; 氮沉降 ; 失水过程 ; 光合作用
英文关键词	bryophytes nitrogen deposition dehydration photosynthesis
语种	中文
国家	中国
收录类别	CSCD
WOS类目	FORESTRY
WOS研究方向	Forestry
CSCD记录号	CSCD:5602001
来源机构	北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/233342
作者单位	北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站, 北京 100083, 中国
推荐引用方式 GB/T 7714	闫佳毅,张宇清,秦树高,等. 不同水分条件下苔藓结皮光合能力对氮素添加量的响应[J]. 北京林业大学,2015,35(6):75-80.
APA	闫佳毅.,张宇清.,秦树高.,吴斌.,冯薇.,...&法科宇.(2015).不同水分条件下苔藓结皮光合能力对氮素添加量的响应.水土保持通报,35(6),75-80.
MLA	闫佳毅,et al."不同水分条件下苔藓结皮光合能力对氮素添加量的响应".水土保持通报 35.6(2015):75-80.