云南热区4种人工纯林土壤理化性状分析

Analysis on Soil Physical and Chemical Characteristics of 4 Kinds of Pure Forest Plantation in Hot Area of Yunnan

应用灰色系统理论分析了云南热区主要造林树种———山桂花、西南桦、马尖相思、高阿丁枫４种人工纯林的土壤理化性状，结果表明：有机质、全氮、有效氮、ｐＨ值、水解酸、阳离子交换量、土壤容重、总孔隙度、毛管孔隙度等因素对４种人工林生长的影响较大。此外，１９９３～１９９７年，山桂花林分的土壤肥力呈上升趋势，与季风常绿阔叶林和次生林相同，而西南桦、马尖相思、高阿丁枫３种林分的土壤肥力，１９９３～１９９５年呈下降趋势，１９９５～１９９７年有所回升，与山地雨林相同。幼林期的土壤理化性状分析结果证明。

The soil physical and chemical characteristics of pure forest plantation of Paramichelia baillonii, Betula alnoides, Acacia mangium and Altingia excelsa are analyzed by using grey system theory. The results indicate that organic matter content, total nitrogen content, available nitrogen content, pH value, hydrolytic acid, cation exchange amount, soil bulk density, soil total pore space and capillary pore space are the main factors to affect the growth of these 4 kinds of plantation. From 1993 to 1997, the soil fertility of Paramichelia baillonii plantation shows the tendency of going up, this is similar to monsoon evergreen broad leaved forest and secondary forest. As far as Betula alnoide, Acacia mangium and Altingia excelsa plantation are concerned, the soil fertility shows the tendency of going down during 1993 to 1995 and goes up again during 1995 to 1997, this is similar to mountain rain forest. The results of analysis on soil physical and chemical characteristics of young plantation stage prove the feasibility to manage Paramichelia baillonii, Betula alnoides, Acacia mangium, Altingia excelsa plantation in hot area of Yunnan province.