基于土壤养分的农林生态系统生态交错带动态研究

ynamic research of ecotone has a very important practical significance to a deep understanding of the landscape and ecosystem pattern changes and the process. The Quantitative study in ecological processes of the ecotone is based on the quantitatively determine of the position and width in space of ecotone to return farmland to forest, and it provides methodological support for the evaluation of ecological benefits generated by return farmland to forest comprehensively and objectively. This study was conducted at Bai Ji Xun Township; WeiXi county inYunnan Province.We collect Soil data in the study area, and the moving split-window technique (MSWT) is used to assess the ecotone width exactly. The results shows that: (1) There are significant differences between pH, Organic matter, Total nitrogen, available N, Total phosphorus, available P, Total potassium, available potassium in two plots; (2) The change trends of pH, Organic matter and Total nitrogen in two plots can be better used to determine the position and width of ecotone; (3) The width of the ecotone returning farmland in 2009 is 30m, the width of the ecotone returning farmland in 2003 is 47m. The results of analysis show that: as the growth of the time of returning farmland to forest, ecological ecotone gradually widened.