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首页> 外文期刊>Ecohydrology >Woody plants modulate the temporal dynamics of soil moisture in a semi-arid mesquite savanna
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Woody plants modulate the temporal dynamics of soil moisture in a semi-arid mesquite savanna

机译：木本植物调节半干旱豆科灌木大草原土壤水分的时间动态

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Climate variability and human activities interact to increase the abundance of woody plants in arid and semi-arid ecosystems worldwide. How woody plants interact with rainfall to influence patterns of soil moisture through time, at different depths in the soil profile and between neighboring landscape patches is poorly known. In a semi-arid mesquite savanna, we deployed a paired array of sensors beneath a mesquite canopy and in an adjacent open area to measure volumetric soil water content (θ) every 30 min at several depths between 2004 and 2007. In addition, to quantify temporally dynamic variation in soil moisture between the two microsites and across soil depths we analysed θ time-series using fast Fourier transforms (FFT). FFT analyses were consistent with the prediction that by reducing evaporative losses through shade and reducing rainfall inputs through canopy interception of small rainfall events, the mesquite canopy was associated with a decline in high-frequency (hour-to-hour and day-to-day) variation in shallow θ. Finally, we found that, in both microsites, high-frequency θ variation declined with increasing soil depth as the influence of evaporative losses and inputs associated with smaller rainfall events declined. In this case, we argue that the buffering of shallow soil moisture against high-frequency variations can enhance nutrient cycling and alter the carbon cycle in dryland ecosystems.
机译：气候变化和人类活动相互作用，从而增加了全世界干旱和半干旱生态系统中木本植物的丰度。众所周知，木本植物如何与降雨相互作用，从而随着时间影响土壤剖面不同深度以及相邻景观斑块之间土壤水分的格局。在半干旱的豆科灌木大草原中，我们在豆科灌木冠下和相邻的开放区域中部署了成对的传感器阵列，以在2004年至2007年之间的多个深度每30分钟测量一次土壤土壤含水量（θ）。此外，还需进行量化我们使用快速傅里叶变换（FFT）分析了两个微地点之间以及土壤深度之间土壤水分的时间动态变化。 FFT分析与以下预测相一致：通过遮荫减少蒸发损失，并通过遮盖小雨量事件来减少降雨输入，豆科灌木层与高频（每小时和每天，每天）的下降相关）浅θ的变化。最后，我们发现，在两个微地点，随着土壤蒸发量的增加，蒸发损失的影响和降雨次数的减少，高频θ变化随土壤深度的增加而减小。在这种情况下，我们认为，应对高频变化缓冲浅层土壤水分可以增强养分循环并改变干旱地区生态系统的碳循环。

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