关键词: 土地利用方式, 石漠化治理, 土壤有机碳, 有机碳组分, 喀斯特

Abstract: A pot experiment was conducted to study the differences in cadmium (Cd ) absorption and accumulation of sixty Brassica varieties on the soils added with different concentration of Cd. The results showed that when the soil Cd co ncentration was 06 mg·kg-1 and 12 mg·kg-1, the percentage of t est Brassica varieties whose Cd content exceeded the National Edible Standar d was 833% and 6667%, respectively, suggesting that Brassica was easy to be Cd-polluted. The shoot Cd content of all test varieties was below the National Edible Standard, and the biomass of the varieties Changgengbaicai,Shanghaiqing,Aijisuzhouqing,Qingyou 4,Aijiaokuipianheiyebaicai,Zhouyeheiyoudonger,Gaohuaqinggengbaicai,Zaoshenghuajing,Jinguanqingjiangbai,Xiawangqinggengcai, Lifengqinggengbaicai, and Hangzhouyoudonger was not affected. These 12 Brassica varieties could be planted on the soils with light Cd pollution.

Key words: karst, rocky desertification control, soil organic carbon, land use type, soil organic carbon component