中国岩溶2011，Vol.30Issue(4)：372-378,7.
土地覆盖对岩溶地下河碳汇的影响——以广西打狗河流域为例
Influence of land covers on carbon sink of underground river:A case in the Dagouhe Basin in Guangxi
摘要
Abstract
Taking the Dagouhe Basin in Guangxi Autonomous Region as a study area, the influences of land covers on carbon sink of underground rivers on both the east and west banks are analyzed in this paper. The forest land and farmland respectively occupy 56. 3 % and 15. 15 % of the total area on the east bank, but in the west bank they only respectively occupy 20. 8 % and 12. 95 % of the total area. The bare rocky land and wasteland respectively occupy 29. 57 % and 25. 95 % of the total area on the west bank, while the bare rocky land and wasteland only respectively occupy 14. 19 % and 10. 98 % of the total area on the east bank. The differences of land covers on the east bank and the west bank of the Dagouhe lead to a lot difference of geo-chemical indexes in the carbon cycle of the underground river between the two banks, for example, HCOT-3 Ca2+and PCo2 contents of the underground river on the east bank, being 233. 71 mg/L, 85. 5 mg/L and 909. 46Pa respectively, are higher than that on the west bank, 177. 26 mg/L,64. 65mg/L and 257. 37 Pa respectively; but Sic and pH value of the underground river on the east bank, being 0. 12 and 7. 40 respectively, are lower than that on the west bank, 0. 38 and 7. 85 respectively. Therefore,there are stronger karst dynamic conditions on the east bank. That is why the mean carbon sink intensity of the underground river on the east bank is 14 % higher than that on the west bank. Especially, the carbon sink intensity of the Xiaqiao Underground Stream on the east bank is 3. 7 times as that of the Dandong Underground Stream on the west bank of the Dagouhe. The water S13 Cdic and TOC data of the underground river on the two banks can further prove that some carbon content of the underground river water comes from the land cover environments. Land cover has a very important influence on carbon sink intensity of the underground river.关键词
土地覆盖/地下河/岩溶碳汇/广西打狗河Key words
land cover/ ground stream/ karst carbon sink/ Dagouhe Basin分类
天文与地球科学引用本文复制引用
覃小群,蒙荣国,莫日生..土地覆盖对岩溶地下河碳汇的影响——以广西打狗河流域为例[J].中国岩溶,2011,30(4):372-378,7.基金项目
地质调查项目(1212011087121)资助 （1212011087121）
