【摘要】 以贡嘎山东坡几种森林类型为例,采集林地原状土以减压法测定土壤低吸力段持水曲线,进行幂函数模拟和计算分形维数。结果表明:该地区针叶混交过熟林、冷杉成熟林林地的土壤在低吸力段,各吸力值含水量高,其持水性能有利于森林水文功能的发挥和林木的生长;而次生林,尤其是次生针叶纯林林地的土壤持水性能差。幂函数对研究区土壤低吸力段的持水曲线模拟较好,新指标—分形维数的计算结果充分反映了土壤低吸力段持水性与土壤的结构、质地、有机质含量等因素的关系,为森林水文生态研究提供了新的方法。更多还原

【Abstract】 Undisturbed soil samples taken from different forests on east slope of Gongga Mountain were used to measure water contents within low suctions through decreasing pressure method,and the soil water retention curves were simulated using power function and fractal dimensions were calculated as well.The results showed that the soils of over-mature coniferous mixed forest and mature fir forest had higher water content and retention capacity within low suction,were favorable for forest hydrological function and growth.Water retention of soil from secondary forest,especially that of the pure fir forest was the worst.The power function simulated water retention curve well and fractal dimension reflected its relationship with soil structure,texture and the content of organic matter.更多还原