Spatio-temporal variability and its affecting factors of soil available copper and zinc in zhangjigang city, China
Based on the Second National Soil Survey (1980) and latest soil survey data (2004), this study analyzed spatio-temporal variability of soil available copper (Cu) and zinc (Zn) in Zhangjiagang city, an industrialized vs. rural area in Yangtze River Delta region. Factors affecting the variability, such as soil properties, agricultural management practices and environmental pollution were dis cussed. The results indicated that concentrations of soil available Cu and Zn had significantly increased during the past more than 20 years in this area. Spatially, although the distribution pattern of higher concentrations of soil available Cu and Zn in Anthrosols than those in Cambosols has not significantly changed during this period, the areas with high levels of soil available Cu and Zn were found in both of soils. This spatial and temporal variability was owing to the effects of the intrinsic factors such as a decrease of soil pH and an increase of soil organic matter on soil available Cu and Zn that was resulted from extrinsic factors such as changes of agricultural management practices and development of industry. At the same time, wastes with high levels of Cu and Zn from industrial, agricultural and municipal activities entering into soils can lead to increase of soil available Cu and Zn. As a result of the variability, soil available Cu had already been excessive level to crop growth, which should pay attention to. Although soil available Zn increased, it is still deficient for crop growth in a certain amount area of soil. Zinc fertilizers would be appropriately applied to improve crop yield and quality.
Available Cu and Zn spatio-temporal variability affecting factors Zhangjiagang city
Y. B. Qi L. X. Yah B. Huang
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Science, Nanjing 210008, China
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
107-108
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）