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	Nitrogen and phosphorus additions alter nutrient dynamics but not resorption efficiencies of Chinese fir leaves and twigs differing in age
	Chen F. S.; Niklas, K. J.; Liu, Y.; Fang, X. M.; Wan, S. Z.; Wang, H. M.
	2015
关键词	evergreen tree species nitrogen and phosphorus interaction nitrogen deposition nutrient resorption red soil region terrestrial ecosystems carbon sequestration semiarid grassland temperate forests leaf traits rain-forest life-span deposition fertilization growth
英文摘要	It is unclear how or even if phosphorus (P) input alters the influence of nitrogen (N) deposition in a forest. In theory, nutrients in leaves and twigs differing in age may show different responses to elevated nutrient input. To test this possibility, we selected Chinese fir (Cunninghamia lanceolata) for a series of N and P addition experiments using treatments of +N1 - P (50 kg N ha(-1) year(-1)), + N2 - P (100 kg N ha(-1) year(-1)), -N + P (50 kg P ha(-1) year(-1)), + N1 + P, + N2 + P and - N - P (without N and P addition). Soil samples were analyzed for mineral N and available P concentrations. Leaves and twigs in summer and their litters in winter were classified as and sorted into young and old components to measure N and P concentrations. Soil mineral N and available P increased with N and P additions, respectively. Nitrogen addition increased leaf and twig N concentrations in the second year, but not in the first year; P addition increased leaf and twig P concentrations in both years and enhanced young but not old leaf and twig N accumulations. Nitrogen and P resorption proficiencies in litters increased in response to N and P additions, but N and P resorption efficiencies were not significantly altered. Nitrogen resorption efficiency was generally higher in leaves than in twigs and in young vs old leaves and twigs. Phosphorus resorption efficiency showed a minimal variation from 26.6 to 47.0%. Therefore, P input intensified leaf and twig N enrichment with N addition, leaf and twig nutrients were both gradually resorbed with aging, and organ and age effects depended on the extent of nutrient limitation.
出处	Tree Physiology
卷	35
期	10
页	1106-1117
语种	英语
ISSN号	0829-318X
DOI标识	10.1093/treephys/tpv076
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/43511]
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	Chen F. S.,Niklas, K. J.,Liu, Y.,et al. Nitrogen and phosphorus additions alter nutrient dynamics but not resorption efficiencies of Chinese fir leaves and twigs differing in age. 2015.

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