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首页> 外文期刊>Plant and Soil >Litter N:P ratios indicate whether N or P limits the decomposability of graminoid leaf litter.
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Litter N:P ratios indicate whether N or P limits the decomposability of graminoid leaf litter.

机译：凋落物N：P比率表明N或P是否限制了类叶凋落物的可分解性。

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The N:P ratio of leaf litter may determine if decomposability is N-limited (litter with low N:P ratio) or P-limited (litter with high N:P ratio). To test this hypothesis and to determine the threshold between N and P limitation, we studied relationships between litter N and P concentrations, litter mass loss and effects of fertilisation on litter mass loss in laboratory experiments. Leaf litter of 11 graminoid species was collected in Swiss and Dutch wetlands, yielding 84 litter samples with a broad range of N and P concentrations (3.2-15.1 mg N g-1, 0.04-1.93 mg P g-1) and with N:P mass ratios ranging from 5 to 100. On nutrient-free sand, dry mass loss after five or ten weeks (5.5-53% of initial mass) correlated positively with the N and P concentrations of the litter. Within species, mass loss correlated mainly with N for litter with low N:P ratio, and with P for litter with high N:P ratio, in agreement with our hypothesis. Among species, however, these relationships did not exist, and decomposition rather correlated with the specific leaf area. When the litter was incubated on fertilised sand, 35 out of 50 litter samples decomposed faster than on nutrient-free sand. Decomposition was generally accelerated by P fertilisation (i.e. P-limited) when the N:P ratio of the litter was above 25 and the P concentration below 0.22 mg g-1, supporting our hypothesis. N-limited decomposition was not significantly related to the litter N:P ratio but occurred rarely for litter with N:P ratio greater than 25, and only for litter with N concentration below 11.3 mg g-1. We conclude that the N:P ratio of leaf litter indicates whether its decomposability is more likely to be N- or P-limited. The critical N:P ratio (threshold between N and P limitation) appeared to be 25 for graminoid leaf litter..
机译：凋落物的N：P比可以确定可分解性是N受限（N：P比低的垃圾）还是P受限（N：P比高的垃圾）。为了检验该假设并确定氮磷限量的阈值，我们在实验室实验中研究了氮和磷含量，凋落物质量损失以及施肥对凋落物质量损失的影响之间的关系。在瑞士和荷兰的湿地中收集了11种类蠕虫的叶子凋落物，得到了84个凋落物样本，其N和P浓度范围很广（3.2-15.1 mg N g-1、0.04-1.93 mg P g-1）和N：磷的质量比为5到100。在无营养的沙土上，五到十周（初始质量的5.5-53％）后的干重损失与垫料中氮和磷的含量呈正相关。与我们的假设一致，在物种内部，质量损失主要与N：P比率低的凋落物的N和与N：P比率高的凋落物的P相关。然而，在物种之间不存在这些关系，而是分解与特定叶面积相关。当垃圾在肥料砂上孵育时，50个垃圾样本中有35个的分解速度要快于无营养的沙子。当垫料的N：P比率高于25并且P浓度低于0.22 mg g-1时，一般通过P施肥（即P限制）促进分解。这支持了我们的假设。 N限制分解与凋落物N：P比率没有显着关系，但很少发生在N：P比率大于25的凋落物上，仅发生在N浓度低于11.3 mg g-1的凋落物上。我们得出的结论是，凋落物的N：P比率表明其可分解性是否更有可能受到N限制或P限制。对于粒状凋落物，临界N：P比（N和P限制之间的阈值）似乎为25。

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