关键词: 温度, 温度, 光照, 酸碱度, 盐浓度, 渗透压, 埋藏深度

Abstract: The study is to explore the correlation between land use patterns and soil carbon pool, soil heavy metals and SOC under different land use patterns. Through stratified sampling (topsoil, middle-level soil and deep soil) and in-door computational analysis, the variation characteristics of SOC reserves under different land use types in 12 cities and counties of central and western Gansu were investigated. The index of soil organic abundance and correlation coefficient were introduced to clarify the correlation between soil heavy metals and SOC. The results showed that, the order of soil organic abundance value was forest＞land for construction＞ garden plot＞cultivated land＞ lawn; besides, the correlation of SOC and 5 typical heavy metals (Hg, Cd, Cr, As and Pb) was significant, garden and the land for construction had the highest r of 0.99, the forest and the cultivated land took the second place, with r=0.87 and r=0.86 respectively. In conclusion, land use patters influence SOC reserves, and the quantitative analysis indicate that the soil heavy metal reserves are closely related to organic carbon contents.