Nitrogen additions and litter decomposition: A meta-analysis

被引:822
作者
Knorr, M
Frey, SD [1 ]
Curtis, PS
机构
[1] Univ New Hampshire, Dept Nat Resources, Durham, NH 03824 USA
[2] Ohio State Univ, Dept Ecol Evolut & Organismal Biol, Columbus, OH 43210 USA
关键词
litter decay; litter quality; meta-analysis; N addition and litter decay; nitrogen deposition; nitrogen fertilization;
D O I
10.1890/05-0150
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
We conducted a meta-analysis of previously published empirical studies that have examined the effects of nitrogen (N) enrichment on litter decomposition. Our objective was to provide a synthesis of existing data that comprehensively and quantitatively evaluates how environmental and experimental factors interact with N additions to influence litter mass loss. Nitrogen enrichment, when averaged across all studies, had no statistically significant effect on litter decay. However, we observed significant effects of fertilization rate, site-specific ambient N-deposition level, and litter quality. Litter decomposition was inhibited by N additions when fertilization rates were 2-20. times the anthropogenic N-deposition level, when ambient N deposition was 5-10 kg N(.)ha(-1.)yr(-1), or when litter quality was low (typically high-lignin litters). Decomposition was stimulated at field sites exposed to low ambient N deposition (<5 kg N(.)ha(-1.)yr(-1)) and for high-quality (low-lignin) litters. Fertilizer type, litterbag mesh size, and climate did not influence the litter decay response to N additions.
引用
收藏
页码:3252 / 3257
页数:6
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