Nature and nurture in the dynamics of C, N and P during litter decomposition in Canadian forests

被引:153
作者
Moore, Tim R. [1 ,2 ]
Trofymow, J. A. [3 ]
Prescott, Cindy E. [4 ]
Titus, B. D. [3 ]
机构
[1] McGill Univ, Dept Geog, Montreal, PQ H3A 2K6, Canada
[2] McGill Univ, Global Environm & Climate Change Ctr, Montreal, PQ H3A 2K6, Canada
[3] Canadian Forest Serv, Pacific Forestry Ctr, Victoria, BC, Canada
[4] Univ British Columbia, Fac Forestry, Vancouver, BC V6T 1W5, Canada
关键词
Litter; Forests; Decomposition; Carbon; Nitrogen; Phosphorus; Ecological stoichiometry; C:N:P quotients; NITROGEN; PATTERNS; RATIOS; STOICHIOMETRY; PHOSPHORUS; NUTRIENTS; WORLDWIDE; QUALITY; CARBON; RATES;
D O I
10.1007/s11104-010-0563-3
中图分类号
S3 [农学(农艺学)];
学科分类号
090104 [作物信息科学与技术];
摘要
We measured changes in carbon (C), nitrogen (N) and phosphorus (P) concentrations and mass of 10 foliar litters decomposing over 12 years at 21 sites across Canada, ranging from subarctic to temperate, to evaluate the influence of litter quality (nature) and forest floor (nurture) on N and P dynamics. Most litters lost P faster than N, relative to C, except in one litter which had a high initial C:P quotient (2,122). Net N loss occurred at mass C:N quotients of between 33 and 68, positively correlated with the C:N quotient in the original litter, and net P loss likely occurred at C:P quotients between 800 and 1,200. Forest floor properties also influenced N and P dynamics: the higher the C:N or C:P quotient in the surface soil organic matter, the smaller the proportion of initial N or P left in the decomposing litter, relative to C. There was a convergence of C:N and C:P quotients as the litters decomposed, with an overall mass ratio of 427:17:1 when the litters reached 20% original C remaining. These results, covering a wide range of sites and litters and thus decomposition rates, showed that the C:N:P quotients followed similar trajectories and converged as the litters decomposed. The relative loss of N and P was affected by both the initial litter nutrient concentration and the chemistry of the site forest floor, with the former being more important than the latter, resulting in spatial variations in nutrient content of the forest floor.
引用
收藏
页码:163 / 175
页数:13
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