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首页> 外文期刊>Plant and Soil >Plant traits, litter quality and decomposition in a Mediterranean old-field succession
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Plant traits, litter quality and decomposition in a Mediterranean old-field succession

机译：地中海老场演替过程中的植物性状，凋落物质量和分解

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Human-induced changes in land use lead to major changes in plant community composition which have strong effects on ecosystem processes. Here, we tested the hypothesis that changes in traits of living plants induced by such changes resulted in changes in the quality and decay properties of the litter produced by the different communities. This was done in the context of a secondary succession following land abandonment in the Mediterranean region of Southern France. During the course of succession, species with high specific leaf area (the ratio of leaf area to leaf mass), low leaf dry matter content (the ratio of leaf dry mass to leaf fresh mass) and high leaf nitrogen concentration were progressively replaced by species with opposite characteristics. Accordingly, the initial litter concentrations of carbon (C) and nitrogen (N) decreased, while their C:N ratio and their hemicellulose concentration increased with time after abandonment. Early-successional communities had faster rates of litter decay and N release from litter, but these differences damped out with decomposition time. Nitrogen release from litter was related to initial litter chemical composition, particularly to its N concentration. This also held for litter decay rate, but only during the first 18 months of decomposition. Community functional parameters (i.e. trait values weighed according to the relative abundance of species) were tightly linked to initial litter N concentration, and thereby to litter decay and N loss rates. The strongest correlations were found with leaf dry matter content, which therefore appears as a powerful marker of litter properties. This provides further evidence that characteristics of living leaves persist in litter, and that some ecosystem processes can be inferred from plant functional traits..
机译：人为引起的土地利用变化导致植物群落组成发生重大变化，这对生态系统过程产生了重大影响。在这里，我们检验了这样的假设：由这种变化引起的活植物性状的变化导致不同群落产生的凋落物的质量和腐烂特性发生变化。这是在法国南部地中海地区土地被遗弃之后进行第二次继承的背景下完成的。在演替过程中，逐渐将高比叶面积（叶面积与叶质量之比），低叶干物质含量（叶干质量与叶鲜质量之比）和高叶氮浓度的物种替换为物种具有相反的特征。因此，弃置后的初始凋落物碳（C）和氮（N）浓度降低，而它们的C：N比和半纤维素浓度随时间增加。早期成功群落的凋落物腐烂和氮从凋落物中释放的速度更快，但是这些差异随着分解时间而减弱。垫料中的氮释放量与垫料的初始化学成分有关，尤其是氮含量。这也适用于凋落物的腐烂率，但仅限于分解的前18个月。群落功能参数（即根据物种的相对丰度衡量的性状值）与初始凋落物氮浓度紧密相关，从而与凋落物的腐烂和氮素流失率紧密相关。发现与叶片干物质含量之间的相关性最强，因此似乎是凋落物特性的有力标志。这提供了进一步的证据，表明活叶的特性仍存在于凋落物中，并且可以从植物功能性状中推断出某些生态系统过程。

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