Shaanxi Provincial Land and Engineering Construction Group CO., LTD., No.7 Guangtai Road, Xi'an, Shaanxi Province, China.
Institute of Soil and Water Conservation, State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, No.3 Taicheng Road, Yangling, Shaanxi Province, China.
Sci Rep. 2020 Apr 30;10(1):7328. doi: 10.1038/s41598-020-63420-x.
Respiration and hydrothermal characteristics of four reconstructed soils in barren gravel land at a site in Shaanxi Province were monitored before, during, and after two precipitation events. Both precipitation events significantly reduced soil temperature but there were great fluctuations in temperature after the second precipitation event. Moreover, precipitation increased the moisture content of the reconstructed soils. Before the first precipitation event, the soil volumetric water content was relatively stable, while it gradually decreased before the second precipitation event. The first precipitation event significantly stimulated the respiration rate for all reconstructed soils, while the second precipitation event generally inhibited it, especially during the precipitation event. The key factors influencing respiration for different reconstructed soils were different between the precipitation events. When soil volumetric water content showed persistent variation before precipitation, soil moisture was the most influential factor. In contrast, if water content was stable, soil temperature was more influential. Soil moisture and temperature jointly influenced soil respiration before, during, and after the precipitation event, while soil moisture was always the most influential factor after precipitation.
对陕西省某荒滩砾石地 4 种重构土壤在两次降水前后的呼吸和水热特征进行了监测。两次降水均显著降低了土壤温度，但第二次降水后温度波动较大。此外，降水增加了重构土壤的水分含量。第一次降水前，土壤体积含水量相对稳定，而第二次降水前则逐渐降低。第一次降水显著刺激了所有重构土壤的呼吸速率，而第二次降水则普遍抑制了呼吸速率，尤其是在降水期间。两次降水事件中，不同重构土壤呼吸的关键影响因素不同。当降水前土壤体积含水量持续变化时，土壤水分是最具影响力的因素。相比之下，如果水分含量稳定，则土壤温度的影响更大。土壤水分和温度共同影响降水前后的土壤呼吸，而降水后土壤水分始终是最具影响力的因素。
