黄土高原降雨驱动下流域碳输移特征及其碳流失评估:以羊圈沟坝系流域为例

发布时间：2018-05-11 14:32

本文选题：黄土高原 + 碳输移　；参考：《环境科学》2017年08期

【摘要】：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).
[Abstract]:Based on the study of carbon deposition and runoff carbon transport in typical dam basin of Loess Plateau in rainy season, the driving mechanism of rainfall runoff on carbon loss is discussed, and the carbon erosion flux of watershed is further evaluated. The results show that the monthly fluxes of carbon deposition are 3.33 kg / hm ~ (-1) and 2.18 kg / h ~ (2) C ~ (2 +) in Yangcuigou Dam system. The carbon deposition in dry and wet season has a certain change and has little contribution to the carbon output of the basin. The carbon output in August was 944.89 kg / kg DIC, respectively, which accounted for 55.39and 44.61, respectively, and 300.29 kg / kg DIC in September accounted for 79.97% of the total dissolved inorganic carbon output, respectively. The carbon loss of runoff with different rainfall intensity was different, and the proportion of total dissolved inorganic carbon output was larger. The runoff dissolved carbon output is 156.98 kg / m ~ (-1) and 284.60 kg / m ~ (-1) ~ (-1) ~ (-1) ~ (-1) during the rainy season, and the modulus of carbon loss per month is 1.89kg / m ~ (2) / m ~ (-1) ~ (-1) / m ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1).
【作者单位】：中国科学院生态环境研究中心城市与区域生态国家重点实验室;中国科学院大学;中国科学院地理科学与资源研究所生态网络观测与模拟重点实验室;中国矿业大学(北京)地球科学与测绘工程学院;
【基金】：国家自然科学基金中英合作重大项目(41571130083) 城市与区域生态国家重点实验室开放基金项目(SKLURE2015-2-2) 中国科学院青年创新促进会项目
【分类号】：S157

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