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为了研究人为长期培肥及生产活动对农田土壤有机碳库空间变异性的影响,在关中农田开展了0~100 cm土体范围内的土壤有机碳含量、有机碳密度及碳库活度等研究。结果表明:土壤有机碳含量变化在7.00~23.39 g kg-1,土壤有机碳含量呈明显分布与变异特征,变异性大且变异程度均属中等水平。有机碳、活性有机碳含量在0~100 cm范围内从上到下逐渐递减,而不是“T”型分布,碳库活度从呈递增趋势;土壤有机碳水平上是以村庄为中心向外辐射递减,尤其在0~20 cm土层规律性更加明显;0~100 cm土壤有机碳密度的水平分布呈随距村庄距离的增加先增加后减少的分布规律。由此得出,关中农田土壤有机碳库的空间变异明显地印记着长期人为作用土壤的历史痕迹,也是关中地区农业文明发展史的有效佐证之一。
In order to study the effect of man-made long-term fertilization and production activities on the spatial variability of soil organic carbon pool in farmland, the soil organic carbon content, organic carbon density and carbon pool activity in 0 ~ 100 cm soil layer were studied in Guanzhong farmland . The results showed that the content of soil organic carbon varied from 7.00 to 23.39 g kg-1, the soil organic carbon content showed obvious distribution and variation characteristics, and the variability was large and the variation degree was moderate. Organic carbon and active organic carbon decreased gradually from top to bottom in the range of 0 ~ 100 cm, but not in the “T” type. The activity of carbon pool showed an increasing trend from the top to the bottom. The soil organic carbon was centered on villages The intensity of soil organic carbon in 0 ~ 100 cm soil layer decreased with increasing distance from the village. It is concluded that the spatial variation of soil organic carbon pool in Guanzhong farmland clearly marks the historical traces of long-term human-induced soil and is also one of the valid evidences for the history of the development of agricultural civilization in the Guanzhong area.