葡萄农田土壤呼吸时空变异性及其与土壤温湿度的关系

发布时间：2018-07-01 11:32

本文选题：土壤呼吸速率 + 日变化　；参考：《兰州大学学报(自然科学版)》2016年01期

【摘要】：2013年7-10月通过对敦煌市南湖乡境内的葡萄种植区有根、无根区域土壤呼吸进行系统观测,分析该地土壤呼吸的时空变化特征及其与温湿度之间的关系.结果表明:葡萄在生长季的各时期土壤呼吸速率的日变化基本为不对称的双峰型曲线,有根区土壤呼吸速率大于无根区的,且二者日变化差异明显,可估算出根呼吸占土壤总呼吸的比例.在日尺度上,0 cm土壤温度与土壤呼吸速率相关性较好,而5 cm土壤温度峰值与土壤呼吸速率峰值之间有位相差,在无根区二者滞后约3 h,有根区滞后时间较小.扩散系数和光合有效辐射显著影响土壤呼吸速率,是迟滞发生的主要原因.土壤温湿度对有根、无根区土壤呼吸的影响有差异.估算葡萄农田土壤呼吸需考虑其距离树干的空间差异性和迟滞现象的影响。
[Abstract]:Through systematic observation of soil respiration in grape growing area in Nanhu Township of Dunhuang City in July and October 2013, the spatio-temporal variation characteristics of soil respiration and the relationship between soil respiration and temperature and humidity were analyzed. The results showed that the diurnal variation of soil respiration rate in each growing season of grape was basically an asymmetrical bimodal curve, and the respiration rate in root region was higher than that in rootless area, and the diurnal variation of soil respiration rate in root region was obviously different. The ratio of root respiration to total soil respiration can be estimated. There was a good correlation between soil temperature of 0 cm and soil respiration rate on a daily scale, but there was a difference between the peak value of 5 cm soil temperature and the peak value of soil respiration rate. The lag time between them was about 3 hours in the rootless area, and the lag time in the root zone was smaller. Diffusion coefficient and photosynthetic effective radiation significantly affected soil respiration rate, which was the main cause of lag. The effects of soil temperature and humidity on soil respiration in rootless and rootless areas were different. In order to estimate soil respiration in grape field, the spatial difference and hysteresis from the tree trunk should be taken into account.
【作者单位】：兰州大学西部环境教育部重点实验室;
【基金】：国家自然科学基金项目(31370467,41571016) 中央高校基本科研业务费专项资金项目(lzujbky-2015-136)
【分类号】：S151.9

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