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首页> 外文期刊>The Science of the Total Environment >Differential stoichiometric responses of shrubs and grasses to increased precipitation in a degraded karst ecosystem in Southwestern China
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Differential stoichiometric responses of shrubs and grasses to increased precipitation in a degraded karst ecosystem in Southwestern China

机译：西南喀斯特退化生态系统中灌木和草对降水增加的化学计量差异响应

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摘要

The elemental concentrations of both plants and soils are sensitive to variations in precipitation due to the limiting roles of water on soil processes and plant growth in karst ecosystems of Southwestern China; however, precipitation is predicted to increase in this region. Nevertheless, it is unclear how the elemental composition of soils and plants might respond to such increases in moisture. Particularly, how potassium (K) may behave as a key mediator in the regulation of the water potential of plants. For this study, the responses of the elemental composition of both soils and plants to the variable addition of water were investigated. Two grasses (Cymbopogon distans and Arundinella setosa) and two shrubs (Carissa spinarum and Bauhinia brachycarpa) were investigated under four levels of watering treatments 0%, +20%, +40%, and +60%, relative to the annual rainfall, respectively. Compared to the control (CK), the soil water content (SWC) increased to 3.75, 3.86, and 4.34 mg g(-1) in T1, T2, and T3 groups, respectively (p < 0.05). Non-metal elements (C, H, N, S, and P, except for Si) in the soil were relatively stable with water addition; however, metal elements (Al, Na, Mg, Fe, and K, along with Si) increased significantly, whereas Zn and Ca decreased (p < 0.05). With water addition, leaf N and P remained unchanged in all four species, while K, Mg, and S decreased in both shrubs (higher C:K, N:K, and P:K). Increases in Fe, Si, and K were observed in both grasses (lower C:K, N:K, and P:K), which suggested that K played distinct roles for water regulation in shrubs and grasses. These findings implied that the Science elemental compositions of both soils and plants might be altered with increasing precipitation in the future, where different plant types may adopt distinct K-regulation strategies to cope with variable soil moisture. (C) 2019 Elsevier B.V. All rights reserved.
机译：由于水在西南喀斯特生态系统中对土壤过程和植物生长的有限作用，因此植物和土壤的元素浓度对降水变化敏感。但是，预计该地区的降雨量将增加。然而，目前尚不清楚土壤和植物的元素组成如何对这种水分增加做出反应。特别是，钾（K）在调节植物水势中可能起关键介质的作用。在本研究中，研究了土壤和植物元素组成对水的可变添加的响应。在相对于年降雨量分别为0％，+ 20％，+ 40％和+ 60％的四个水处理水平下，分别调查了两种草（长春花草和刚毛大Ar）和两种灌木（锦绣花和紫荆）。 。与对照组（CK）相比，T1，T2和T3组的土壤含水量（SWC）分别增加到3.75、3.86和4.34 mg g（-1）（p <0.05）。土壤中的非金属元素（除Si之外的C，H，N，S和P）在添加水后相对稳定。然而，金属元素（Al，Na，Mg，Fe和K，以及Si）显着增加，而Zn和Ca减少（p <0.05）。随着水分的添加，两种灌木的叶片N和P均保持不变，而两种灌木中的K，Mg和S均下降（C：K，N：K和P：K较高）。在两种草中均观察到Fe，Si和K的增加（较低的C：K，N：K和P：K），这表明钾在灌木和草中的水分调节中起着不同的作用。这些发现暗示，未来土壤中植物的科学元素组成可能会随着降水的增加而发生变化，在这种情况下，不同植物类型可能会采用独特的钾调节策略来应对土壤水分的变化。 （C）2019 Elsevier B.V.保留所有权利。

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