不同放牧强度下土壤侵蚀对典型草原土壤有机碳的影响

发布时间：2018-05-20 17:35

本文选题：典型草原 + 降雨模拟　；参考：《水土保持学报》2017年04期

【摘要】：针对典型草原土壤侵蚀区的碳储量及碳流失问题,采用野外调查取样和人工模拟降雨相结合的方法,探讨了不同放牧强度下内蒙古大针茅典型草原的土壤侵蚀量、有机碳含量、有机碳流失量的变化情况。结果表明:(1)放牧强度对表层土壤有机碳的影响较大,有机碳储量呈先增加后减少的趋势,表现为轻度放牧对照中度放牧重度放牧,且不同放牧强度下0—40cm土壤有机碳变化明显,为明显的垂直递减趋势;(2)降雨强度对草地土壤侵蚀的影响最大,其次为坡度,放牧强度的影响较小;(3)坡度一定时,土壤有机碳流失量受降雨强度的影响程度远大于放牧强度,降雨强度越大,放牧强度越大,土壤侵蚀量和土壤有机碳流失量就越大。可见,控制放牧强度和因地制宜的分区放牧对于控制草地土壤侵蚀十分必要。
[Abstract]:Aiming at the problem of carbon storage and carbon loss in typical steppe soil erosion area, the soil erosion amount and organic carbon content of typical steppe in Inner Mongolia under different grazing intensities were studied by combining field investigation and artificial simulated rainfall. Changes in organic carbon loss. The results showed that the grazing intensity had a great effect on the organic carbon in the topsoil, and the organic carbon storage increased first and then decreased, which was shown as moderate grazing and heavy grazing in the light grazing control. Under different grazing intensity, the change of soil organic carbon in 0-40cm was obvious, which was the obvious trend of vertical decline. Rainfall intensity had the greatest influence on soil erosion of grassland, followed by slope, and the influence of grazing intensity was small when the slope was fixed. The amount of soil organic carbon loss affected by rainfall intensity is much greater than that of grazing intensity. The larger the rainfall intensity, the greater the grazing intensity, the greater the soil erosion and soil organic carbon loss. It can be seen that it is necessary to control grassland soil erosion by controlling grazing intensity and taking measures according to local conditions.
【作者单位】：北京林业大学水土保持学院;水利部牧区水利科学研究所;
【基金】：国家自然科学基金项目(41301302)
【分类号】：S812.2

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