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首页> 外文期刊>Plant and Soil >Effects of drought and elevated temperature on biochemical composition of forage plants and their impact on carbon storage in grassland soil.
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Effects of drought and elevated temperature on biochemical composition of forage plants and their impact on carbon storage in grassland soil.

机译：干旱和高温对饲草植物生化成分的影响及其对草地土壤碳储量的影响。

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Aims: The objective of this study was to investigate the effects of future warming and drought on (1) the biochemical composition of above-ground biomass of forage plants (Festuca arundinacea and Dactylis glomerata), (2) the potential mineralization of this material in soil, and (3) its priming effect on native soil organic matter. Methods: We sampled above-ground plant material from spring regrowth and summer regrowth of a climate change experiment. While in spring, the plants were well watered, the summer regrowth was exposed to drought and elevated temperature (+3 degrees C) by infrared heating of the canopy during 3 weeks. We assessed the elemental and isotopic composition, lignin and non-cellulosic carbohydrate content and composition of plant material grown under all three conditions. Its mineralization potential in soil and priming effects were evaluated during laboratory incubation. Results: Warming had no significant effect on elemental and stable isotope composition of both plant materials. In contrast, it resulted in reduction of lignin content for both plant species and decrease of the lignin-to-N ratio for F. arundinacea and increased non-cellulosic carbohydrate content for D. glomerata. Summer regrowth was characterised by increase of delta 13C values, which is consistent with variations in stomatal conductance due to water shortage. Moreover, summer drought induced an increase in N content leading to decrease of the C/N ratio and increase of lignin-to-N ratio of summer regrowth compared to spring regrowth. Differences in decomposition were small, while priming effects were more strongly altered by the different exposure to enviromental. Conclusion: Our results provide direct experimental evidence that extreme climatic events (high temperature and precipitation deficit) have an influence on soil carbon storage particularly through their effect on priming of native soil organic matter induced by altered plant litter. These effects seem to be governed by alterations of stoichiometry and to a smaller extent by alterations of plant chemical composition.
机译：目的：本研究的目的是调查未来变暖和干旱对（1）饲用植物（Festuca arundinacea和Dactylis glomerata）地上生物量的生物化学组成的影响，（2）该材料在喀麦隆的潜在矿化作用。 （3）对原生土壤有机质的引发作用。方法：我们从气候变化实验的春季和夏季再生中抽取了地上植物材料。春季时，植物浇水良好，夏季的再生长在3周内因冠层的红外线加热而遭受干旱和高温（+3摄氏度）的影响。我们评估了在所有三种条件下生长的植物元素的元素和同位素组成，木质素和非纤维素碳水化合物含量以及组成。在实验室孵育过程中评估了其在土壤中的矿化潜力和引发作用。结果：变暖对两种植物材料的元素和稳定同位素组成均无显着影响。相比之下，这导致两种植物的木质素含量降低，以及金缕梅（F. arundinacea）的木质素与N比率降低，并导致D. glomerata的非纤维素碳水化合物含量增加。夏季再生长的特征是δ 13 C值增加，这与缺水导致的气孔导度变化一致。此外，夏季干旱导致氮含量增加，导致夏季再生长的C / N比降低，木质素氮比与春季再生长相比增加。分解的差异很小，而不同的环境暴露会更明显地改变启动作用。结论：我们的结果提供了直接的实验证据，表明极端气候事件（高温和降水不足）对土壤碳储量有影响，特别是通过影响植物凋落物引起的天然土壤有机质的发芽。这些作用似乎是由化学计量的改变所决定的，而在较小程度上是由植物化学组成的改变所决定的。

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