论文部分内容阅读
以中国南方喀斯特地区具有代表性的贵州为例,选取3个典型喀斯特石漠化综合治理示范区,以划分出的4条核心小流域为监测单元,对各示范区内及示范区之间不同等级石漠化样地表层土壤有机碳密度特征进行比较。结果表明:各示范区之间表层土壤有机碳密度变异性较大,表现为红枫湖示范区(6.12 kg m-2)>鸭池示范区(5.21 kg m-2)>花江示范区(2.80 kg m-2);不同等级石漠化样地之间土壤有机碳密度整体表现为无明显、潜在石漠化样地大于中、强度石漠化样地;岩石裸露率是影响喀斯特地区表层土壤碳密度的重要影响因子之一,特别对于中、强度石漠化区;地貌、气温和不同工程措施也在一定程度上影响到土壤有机碳密度特征。喀斯特石漠化综合治理具备巨大的固碳减排效应,采取有效措施增加有机碳蓄积量是今后石漠化综合治理的关键。
Taking Guizhou, a typical karst area in southern China, as an example, three typical karst rocky desertification integrated control demonstration zones were selected. The four core small watersheds were selected as monitoring units, and different demonstration zones and demonstration zones Soil organic carbon density characteristics of surface rocky desertified landforms were compared. The results showed that the variability of surface organic carbon density in each demonstration area was relatively high, ranging from 2.12 kg m-2 in Hongfeng Lake to 5.21 kg m-2 in Duck Pool and 2.80 kg m- kg m-2). Soil organic carbon density showed no significant difference between different grades of rocky desertification plots, and the potential rocky desertification sample plots were larger than those of medium and strong rocky desertification plots. The rock bareness rate affected the surface soil of karst area Carbon density is one of the most important influencing factors, especially for medium and high intensity rocky desertification areas. Geomorphology, air temperature and different engineering measures also affect soil organic carbon density to a certain extent. Comprehensive management of karst rocky desertification has a huge effect of carbon sequestration and emission reduction. Taking effective measures to increase the accumulation of organic carbon is the key to the comprehensive management of rocky desertification in the future.