渭北台塬区废弃宅基地整治前后土壤总碳变化研究——以陕西省澄城县为例

Research on changes of soil total carbon in abandoned homestead of Weibei tableland area after land remediation——A Case Study in Chengcheng County,Shaanxi Province

通过对澄城县废弃宅基地整治前后(0～60cm)土壤总碳含量变化及整治后耕作近10年土壤总碳变化情况研究分析,探究废弃宅基地整治前后及多年耕种对土壤总碳变化的影响。结果表明:渭北台塬区废弃宅基地土壤总碳含量在0～20、20～40、40～60cm三个土层上依次为18.25、17.45、17.51g·k^(-1);经过10年的耕种,0～20cm土层土壤总碳含量最高,为23.44g·kg^(-1),各层土壤总碳含量总体呈现0～20cm>40～60cm>20～40cm,总碳含量增幅呈现20～40cm>40～60cm>0～20cm,其中0～20cm,相比5年前呈现出降低趋势;澄城县成熟耕地土壤总碳平均含量在三个土层上分别为20.74、28.60、15.18g·kg^(-1),相比成熟耕地,20～40cm土层土壤总碳含量增幅潜力最大。

Analysis of total soil carbon changes after consolidation and cultivation for nearly ten years was done in order to investigate the change of total soil carbon content after the abandonment of the house site,before and after being remedied and after many years of cultivation.The results showed that:(1)soil total carbon content of abandoned residential land in Weibei tableland was 18.25 g·kg-1,17.45 g·kg-1 and 17.51 g·kg-1 on three soil layers of 0~20 cm,20~40 cm and 40~60 cm.After 10 years of cultivation,the total carbon content of0~20 cm soil layer was the highest,which was 23.44 g·kg-1.The total carbon content in each layer showed 0~20 cm>40~60 cm>20~40 cm,and the total carbon content increased by 20~40 cm>40~60 cm>0~20 cm,in which 0~20 cm showed a decreasing trend compared with five years ago.The average total carbon content of the soil in the mature cultivated land in Chengchengcounty is 20.74 g·kg-1,28.60 g·kg-1 and 15.18 g·kg-1 on the soil layer respectively.Compared with the mature cultivated land,the growth potential of total carbon content in the soil of 20~40 cm soil layer is the greatest.