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通过对黄土高原典型坝系流域雨季碳沉降与径流碳输移过程的研究,探讨降雨径流过程对流域碳流失的驱动机制,并进一步评估流域碳侵蚀通量.结果表明,羊圈沟坝系流域湿、干季碳沉降月通量为3.33 kg·hm~(-2)、2.18 kg·hm~(-2),干湿季碳沉降存在一定变化且对流域碳输出贡献较小.流域8月碳输出量为944.89 kg·km~(-2),其中DOC、DIC输出量分别占55.39%、44.61%;9月碳输出量为300.29 kg·km~(-2),DOC、DIC输出量分别占23.03%、79.97%,不同降雨强度径流的碳流失量不同,总体溶解性无机碳输出比重较大.羊圈沟小雨强降雨事件中径流溶解性碳输出量为156.98 kg·km~(-2),中等雨强降雨事件中径流碳输出284.60 kg·km~(-2);该流域雨季月均碳流失模数为1.89 kg·(km~2·mon)~(-1),经评估得出研究区域年碳流失模数为2.70kg·(km~2·a)~(-1).
Through the research on the carbon sequestration and the process of carbon transport during the rainy season in the typical dam system of the Loess Plateau, the driving mechanism of the carbon loss during the runoff from the rainfall-runoff process was discussed and the carbon eutrophication fluxes of the river basin were evaluated. The results show that, In wet and dry seasons, the monthly flux of carbon deposition was 3.33 kg · hm -2 and 2.18 kg · hm -2, respectively, with some changes in carbon sequestration during dry and wet seasons, The carbon output was 944.89 kg · km ~ (-2), of which DOC and DIC output accounted for 55.39% and 44.61% respectively. The carbon output in September was 300.29 kg · km ~ (-2) Accounting for 23.03% and 79.97%, respectively, with different amounts of carbon loss due to different rainfall intensity runoff and a larger proportion of total dissolved inorganic carbon output.Radial dissolved carbon output was 156.98 kg · km ~ (-2) ), The runoff carbon output was 284.60 kg · km ~ (-2) in moderately heavy rain events, and the monthly mean carbon loss modulus in rainy season was 1.89 kg · (km ~ 2 · mon) -1 The annual loss modulus of carbon in the studied area was 2.70kg · (km ~ 2 · a) -1.