QQ客服 官方微博 反馈留言

	Foliar and soil (15)N natural abundances provide field evidence on nitrogen dynamics in temperate and boreal forest ecosystems
	Cheng S. L. ; Fang H. J. ; Yu G. R. ; Zhu T. H. ; Zheng J. J.
	2010
关键词	(15)N natural abundance N availability N transformation N loss Enrichment factor Mountain transect mycorrhizal fungi n-mineralization carbon-cycle delta-n-15 plant gradient availability patterns nitrate enrichment
英文摘要	The natural abundance of (15)N (delta(15)N) in plants and soils is an ideal tool for assessing ecosystem N dynamics. However, many of the mechanisms driving the variability of foliar and soil delta(15)N values within and across ecosystems are still unclear. In this study, we analyzed the patterns of N concentrations and delta(15)N values in leaves, bulk soils and soil mineral N as well as soil N turnover rates across four temperate and boreal forest ecosystems along a mountain transect. The results showed that plant species and soil properties directly controlled soil delta(15)N patterns and climate factors (air temperature and precipitation) indirectly affected foliar delta(15)N patterns. Foliar N concentrations varied consistently with the concentrations of soil available N and soil NO (3) (-) -N, whereas foliar delta(15)N was most closely associated with the delta(15)N of soil NH (4) (+) , the most abundant form of N in soil solution. (15)N enrichment in surface mineral soil in high elevation forests was mainly attributed to (15)N-enriched organic N accumulation. Furthermore, the foliar enrichment factor (epsilon(p/s) = I '(15)N(foliage)-I '(15)N(soil)) was significantly correlated with N transformation and loss rates, and was negatively correlated with the ratio of NH (4) (+) to total inorganic N. These results suggest that foliar delta(15)N value and foliar N concentration together accurately reflect the N availability of forest ecosystems. Foliar epsilon(p/s) can act as an integrated proxy to reflect the status of N cycling within or across forest ecosystems. Soil nitrification and species' NH (4) (+) to NO (3) (-) uptake ratios are key processes controlling foliar delta(15)N patterns in N-limited forest ecosystems. Our findings improve the mechanistic understanding of the commonly observed variability in foliar and soil delta(15)N within and across forest ecosystems.
出处	Plant and Soil
卷	337
期	1-2
页	285-297
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/311030/24195]
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	Cheng S. L.,Fang H. J.,Yu G. R.,et al. Foliar and soil (15)N natural abundances provide field evidence on nitrogen dynamics in temperate and boreal forest ecosystems. 2010.

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。