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首页> 外文期刊>Ecological research >Endogenous versus exogenous nutrient affects C, N, and P dynamics in decomposing litters in mid-subtropical forests of China
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Endogenous versus exogenous nutrient affects C, N, and P dynamics in decomposing litters in mid-subtropical forests of China

机译：内源和外源养分对中国中亚热带森林分解凋落物中碳，氮和磷的动态影响

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摘要

The effect of nutrient availability on litter decomposition has been a major focus of global change ecology. The relative impacts of endogenous (litter) and exogenous (soil) nutrient availability remain unclear. We studied the nutrient dynamics of decomposition in litter from two species with contrasting litter nutrient contents and stoichiometry: Pinus massoniana and Castanopsis sclerophylla. During a 540-day field incubation, we manipulated exogenous nutrient levels by adding mi-crobially available C ( + C), N ( + N), P ( + P), and all three ( + CNP) at 90-day intervals. Relative to the no-nutrient control (CK), nutrient additions decreased organic C retention in C. sclerophylla, with the greatest effect observed in + CNP. Nitrogen content in P. massoniana litter similarly increased with nutrient addition, particularly + P and + CNP. The P addition treatments also increased P content in the litter of both species. Nitrogen content in C. sclerophylla and organic C content in P. massoniana were unaffected by nutrient additions. The C/N and C/P ratios in decomposing C. sclerophylla litter were significantly lower in the CK treatment, while those of P. massoniana litter were influenced by the interaction of nutrient addition and decomposition time. Increased availability of C, N, and P individually and collectively alters nutrient release dynamics in decomposing foliar litter. Litter quality, as determined by source species, is a key determinant of the impact of exogenous nutrient inputs. A stronger effect of P addition than N addition indicates a relatively N-rich and P-poor ecosystem.
机译：养分利用率对凋落物分解的影响一直是全球变化生态学的主要关注点。内源性（凋落物）和外源性（土壤）养分有效性的相对影响尚不清楚。我们研究了两种具有不同凋落物养分含量和化学计量比的马尾松分解的养分动态：马尾松和硬皮栗。在540天的田间孵化过程中，我们以90天的间隔添加了微生物可利用的C（+ C），N（+ N），P（+ P）和所有三个（+ CNP）来控制外源营养水平。相对于无营养物对照（CK），添加营养物减少了硬叶梭菌中有机碳的保留，在+ CNP中观察到最大的影响。马尾松凋落物中的氮含量也随着营养物的添加而增加，特别是+ P和+ CNP。磷的添加处理还增加了两个物种凋落物中的磷含量。营养物质的添加不会影响硬核梭菌中的氮含量和马尾松中的有机碳含量。在CK处理下，分解硬叶枯枝落叶凋落物的C / N和C / P比明显降低，而马尾松凋落物的C / N和C / P比受养分添加和分解时间的相互作用的影响。分解叶面垫料中的C，N和P的可用性单独增加和共同改变了养分释放的动态。废弃物质量取决于来源物种，是决定外源养分投入影响的关键因素。磷添加的效果比氮添加的效果更强，表明存在相对富氮和贫磷的生态系统。

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  • 来源
    《Ecological research》 |2012年第5期|p.923-932|共10页
  • 作者

    Fu-Sheng Chen; Xue Feng; Chao Liang;

  • 作者单位

    Jiangxi Key Laboratory of Plant Resource, College of Life Sciences and Food Engineering, Nanchang University, No. 999, Xuefuda Road, Honggutan New District, Nanchang 330031, Jiangxi, China;

    Jiangxi Key Laboratory of Plant Resource, College of Life Sciences and Food Engineering, Nanchang University, No. 999, Xuefuda Road, Honggutan New District, Nanchang 330031, Jiangxi, China;

    Department of Soil Science, University of Wisconsin, Madison, WI 53706, USA;

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  • 正文语种 eng
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  • 关键词

    litter decomposition; litter quality; simulated N deposition; nylon net bag method; hilly red soil region;

    机译：垃圾分解;垃圾质量;模拟氮沉降尼龙网袋法;丘陵红壤地区;

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