The Spatial Distribution Of Soil Carbon, Nitrogen And Phosphorus In Coal

The spatial variation of soil nutrient induced by mining subsidence is a key scientific issue to be solved in land consolidation and rehabilitation of mine-grain mixed zone. In this study, we selected three coal-mining subsidence areas, Hanwang, Fangzhuang, and Jiulishan, from Jiaozuomine area in China. There are five representative landscapes: woodlands with fissures, woodlands without fissures, sloped farmlands with irrigation and downslope-tillage(SID), sloped farmlands with non-irrigation and downslope-tillage(SNID), and sloped farmlands with cutting-slope length and downslope-tillage(SCD). The spatial distribution of soil organic carbon(SOC), nitrogen(N), and phosphorus(P) from the five landscapes was investigated. The impacts of ground destruction, land-use, irrigation management and tillage practiceson soil nutrients were explored. Moreover, a comprehensive effect of irrigation and slope position on soil nutrients in subsidence landscapes was examined based on ArcGIS technique. That it can provide the basis for sustainable agricultural development and ecological civilization construction in mine-grain mixed zone.Through a systematic experimental study, main conclusions are obtained as follows:1. Acomparative study on spatial pattern of nutrients inSID, SNID, and SCD suggested that a negative influence of dry cultivation and downslope tillage on soil nutrient stocks; whereas the management practice of irrigation and cutting-slope length and downslope-tillage is an effective protection measures to nutrient stocks.2. Based on ArcGIS, it was found that the interaction influence of irrigation management and slope position on SOC and TP distribution in subsidence sloped framlands is significant. The 137 Cs data showed that soil erosion may exert an apparent effect on the spatial pattern of soil nutrientsin the sloped farmlands.3. Through comparing the spatial pattern of soil nutrients between subsidence farmlands and woodlands, we found that a conversion of woodlands from farmlands in subsidence areas is beneficial to soil nutrient conservation.