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首页> 外文期刊>Plant and Soil >How do elevated [CO sub(2)], warming, and reduced precipitation interact to affect soil moisture and LAI in an old field ecosystem?
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How do elevated [CO sub(2)], warming, and reduced precipitation interact to affect soil moisture and LAI in an old field ecosystem?

机译：升高的[CO sub（2）]，变暖和降水减少如何相互作用以影响旧田间生态系统中的土壤水分和LAI？

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摘要

Soil moisture content and leaf area index (LAI) are properties that will be particularly important in mediating whole system responses to the combined effects of elevated atmospheric [CO sub(2)], warming and altered precipitation. Warming and drying will likely reduce soil moisture, and this effect may be exacerbated when these factors are combined. However, elevated [CO sub(2)] may increase soil moisture contents and when combined with warming and drying may partially compensate for their effects. The response of LAI to elevated [CO sub(2)] and warming will be closely tied to soil moisture status and may mitigate or exacerbate the effects of global change on soil moisture. Using open-top chambers (4-m diameter), the interactive effects of elevated [CO sub(2)], warming, and differential irrigation on soil moisture availability were examined in the OCCAM (Old-Field Community Climate and Atmospheric Manipulation) experiment at Oak Ridge National Laboratory in eastern Tennessee. Warming consistently reduced soil moisture contents and this effect was exacerbated by reduced irrigation. However, elevated [CO sub(2)] mitigated the effects of warming and drying on soil moisture. LAI was determined using an AccuPAR ceptometer and both the leaf area duration (LAD) and canopy size were increased by irrigation and elevated [CO sub(2)]. Changes in LAI were closely linked to soil moisture status. The climate of the southeastern United States is predicted to be warmer and drier in the future, and this research suggests that although elevated [CO sub(2)] will ameliorate the effects of warming and drying, losses of soil moisture will cause declines in the LAI of old field ecosystems in the future.
机译：土壤水分含量和叶面积指数（LAI）的特性对于调解整个系统对大气[CO sub（2）]升高，变暖和降水变化的综合影响尤其重要。变暖和干燥很可能会减少土壤水分，而综合考虑这些因素，这种影响可能会加剧。但是，升高的[CO sub（2）]可能会增加土壤水分，并且与加温和干燥结合使用可能会部分补偿其影响。 LAI对[CO sub（2）]升高和变暖的响应将与土壤水分状况紧密相关，并且可能减轻或加剧全球变化对土壤水分的影响。使用开放式腔室（直径为4米），在OCCAM（旧场社区气候和大气操纵）实验中研究了升高的[CO sub（2）]，变暖和差异灌溉对土壤水分有效性的相互作用。在田纳西州东部的橡树岭国家实验室。气候变暖持续减少了土壤中的水分，减少灌溉又加剧了这种影响。但是，升高的[CO sub（2）]减轻了变暖和干燥对土壤水分的影响。使用AccuPAR接受度计确定LAI，通过灌溉和升高[CO sub（2）]来增加叶面积持续时间（LAD）和冠层大小。 LAI的变化与土壤水分状况密切相关。预计美国东南部的气候将来会更暖和更干燥，并且这项研究表明，尽管[CO sub（2）]升高会减轻温暖和干燥的影响，但土壤水分的损失会导致土壤水分的下降。未来旧田生态系统的LAI。

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