【作者】 何孟； 赵燮京； 王昌全；

【Author】 HE Meng, ZHAO Xie-jing, WANG Chang-quan(Soil and Fertilizer Institute, Sichuan Academy of Agriculture Sciences, Chengdu 610066, China;College of Resource and Environment, Sichuan Agricultural University, Ya’an 625014, China)

【机构】 农业部长江上游农业资源与环境重点实验室； 四川农业大学资源环境学院；

【摘要】 在坡耕地上利用分解袋法对李树叶、梨树叶、杏树叶和枇杷树叶的分解,以及各个试验区的有机碳变化作了研究,结果表明四种果树叶的分解率先快后慢,最后趋于平衡。分解规律用分解指数函数模型Ct=CC0×t-k可以很好地拟合。而四种试验区中土壤有机碳均出现先下降后上升的变化。其中土壤有机碳有向细小粒径即0.25～0.05 mm迁移的趋势。更多还原

【Abstract】 Agro-forestry system has been promoted for soil conservation and soil fertility improvement through covering fruit tree leaves with purple soil. Organic C decomposition of collecting from four species of leaves was studied by the litterbag method. Soil organic C indifferent particle size fraction was studied by wet sieving of fresh soil. We selected the 2 mm, 250 and 50μm mesh sieves. The results indicated that within the first 40 days organic C of leaves from Pyrus pashia Buch-Ham and Primus armeniaca linn decomposed faster than those of Eriobotrya japonica Lindley and Prunus salicina Lindl. But after 120 days decomposition rate had trended to equipoise. Percentage of decomposed organic C could be fitted well by power model Ct= C0×t-k(where Ct represents organic C by time t, C0 represents primeval estimated organic C, k represent decomposed exponential). With the growth of time soil organic C in all four plots decreased firstly and then increased for influences from wastage of purple soil organic C and climatic condition (temperature etc.) . Simultaneously soil organic C manifested a kind of direction of transferring to 250-50μm size fraction, but also different plots would change transferred degree.更多还原