QQ客服 官方微博 反馈留言

	Significance of organic nitrogen acquisition for dominant plant species in an alpine meadow on the Tibet plateau, China
	Xu X. L. ; Ouyang H. ; Kuzyakov Y. ; Richter A. ; Wanek W.
	2006
关键词	organic N uptake C-14 N-15 alpine grassland N acquisition Spirulina microbial biomass nitrogen boreal forest plants amino-acid-uptake soil-nitrogen direct extraction grassland soils carbon roots transformations fumigation
英文摘要	Though the potential of plants to take up organic N (e.g., amino acids) is well established, the true significance of organic N acquisition to plant N nutrition has not yet been quantified under field conditions. Here we demonstrate that organic N contributes significantly to the annual N uptake of three dominant plant species (Kobresia humilis, Saussurea superba and Stipa aliena) of alpine meadows on the Tibet Plateau, China. This was achieved by using double-labelled (C-14 and N-15) algae as a source for slow and continuous release of amino acids, and tracing both labels in the above- and below-ground plant biomass. Four months after addition of algae, between 0.5% and 2.6% of C-14 and 5% and 14% of N-15 from added algae were recovered in the plants, which translate into an uptake of organic N between 0.3 mg N m(-2) and 1.5 mg N m(-2). The calculated contribution of organic N to total N uptake was estimated to range between 21% and 35% for K. humilis, and between 13% and 21% for S. aliena and S. superba, respectively, implying that organic N uptake by grassland plants is quantitatively significant under field conditions in the studied alpine meadows. This finding has important ecological implications with regard to competition for organic N between microorganisms and plant roots.
出处	Plant and Soil
卷	285
期	1-2
页	221-231
收录类别	SCI
语种	英语
ISSN号	0032-079X
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/22653]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Xu X. L.,Ouyang H.,Kuzyakov Y.,et al. Significance of organic nitrogen acquisition for dominant plant species in an alpine meadow on the Tibet plateau, China. 2006.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。