干旱区生态环境知识资源中心(Arid): 塔克拉玛干沙漠南缘豆科与非豆科植物的氮分配

Arid

	塔克拉玛干沙漠南缘豆科与非豆科植物的氮分配
其他题名	Nitrogen allocation and partitioning within a leguminous and two non-leguminous plant species growing at the southern fringe of China’s Taklamakan Desert
	朱军涛; 李向义; 张希明; 林丽莎; 杨尚功
来源期刊	植物生态学报
ISSN	1005-264X
出版年	2010
卷号	34 期号:9 页码:1025-1032
中文摘要	在豆科与非豆科植物光合特性的研究中发现,非豆科植物具有更高的光合速率,与其低的叶氮含量相矛盾.在沙漠中氮素是限制植物生长的关键因子之一,考虑到豆科植物的生物固氮作用和叶氮大部分分配于光合系统,我们假设:(1)非豆科植物具有更低的叶氮含量;(2)分配更少的叶氮于光合系统;(3)具有更高的最大净光合速率(Pmax)和光合氮素利用效率(PNUE).为了验证这些假设,以塔克拉玛干沙漠南缘的豆科植物骆驼刺(Alhagi sparsifolia)和非豆科植物柽柳(Tamarix ramosissima),花花柴(Karelinia caspica)为研究对象,比较了它们的叶氮含量,氮分配,Pmax和PNUE等.结果表明:(1)非豆科植物比豆科植物确实有更低的叶氮含量,且差异达到显著水平;(2)非豆科植物分配更少的叶氮于光合系统,但在光合系统内部具有更高效的氮分配机制;(3)非豆科植物具有更高的Pmax和PNUE.在光合系统内部,非豆科植物分配的叶氮于羧化系统,而豆科植物分配的叶氮于捕光系统.对于非豆科植物而言,其更高的Pmax,PNUE,水分利用效率和表观量子产量,取决于将的叶氮投入到羧化和电子传递系统中.这些生理优势决定了塔克拉玛干沙漠南缘非豆科植物高效的资源捕捉和利用能力
英文摘要	Aims We previously found that non-leguminous species had a higher photosynthetic rate despite lower leaf N content. Nitrogen is a critical factor limiting plant growth in the desert. Our objectives were to determine if,as hypothesized, non-leguminous species have lower leaf N content, allocate a lower fraction of leaf N to photosyn-thesis and have higher maximum net photosynthetic rate (Pmax) and photosynthetic N-use efficiency (PNUE). Methods We compared the leguminous species Alhagi sparsifolia and non-leguminous species Karelinia caspica and Tamarix ramosissima in their typical habitat at the southern fringe of China’s Taklamakan Desert. Important findings As hypothesized, the non-leguminous species had significantly lower leaf N content and allocated a lower fraction of leaf N to photosynthesis. They also were more efficient in photosynthetic N partitioning. The non-leguminous species partitioned a higher fraction of the photosynthetic N to carboxylation and showed higher use efficiency of the photosynthetic N, while the leguminous species partitioned a higher fraction of the photosynthetic N to light-harvesting components. For the non-leguminous species, the higher fraction of leaf N allocated to carboxylation and bioenergetics led to higher Pmax and therefore to higher PNUE, water-use efficiency and apparent quantum yield. These physiological advantages of the non-leguminous species and their higher leaf area ratio may contribute to their higher resource capture ability
中文关键词	豆科植物 ; 氮分配 ; 非豆科植物 ; 光合氮素利用效率 ; 塔克拉玛干沙漠
英文关键词	legume species nitrogen allocation non-legume species photosynthetic nitrogen-use efficiency Taklamakan Desert
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:3990837
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/2XILL650/225903
作者单位	中国科学院新疆生态与地理研究所, 中国科学院干旱区生物地理与生物资源重点实验室, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	朱军涛,李向义,张希明,等. 塔克拉玛干沙漠南缘豆科与非豆科植物的氮分配[J]. 中国科学院新疆生态与地理研究所,2010,34(9):1025-1032.
APA	朱军涛,李向义,张希明,林丽莎,&杨尚功.(2010).塔克拉玛干沙漠南缘豆科与非豆科植物的氮分配.植物生态学报,34(9),1025-1032.
MLA	朱军涛,et al."塔克拉玛干沙漠南缘豆科与非豆科植物的氮分配".植物生态学报 34.9(2010):1025-1032.