金沙江流域不同林分类型的土壤特性及其水源涵养功能研究

Soil Properties and Water Conservation Function of Different Forest Types in Jinshajiang River Watershed

对金沙江流域6种不同林分土壤物理性质、凋落物持水量以及林地土壤贮水性能等进行了研究。结果表明,不同林分的土壤物理性质及其水源涵养功能差异明显。在相同的立地条件下,圣诞树纯林和混交林具有更好的维持地力作用和更高的水源涵养功能。依据林地总贮水量的大小,6种林分最大蓄水量大小依次为圣诞树纯林(2 851.8 t/hm2)>华旱混交林(2 478.9 t/hm2)>云华混交林(2 432.4 t/hm2)>云南松纯林(2 142.8 t/hm2)>华山松纯林(1 851.8 t/hm2)>旱冬瓜纯林(1 620.3 t/hm2)。

An investigation on soil properties, water-holding capacity of litter and soil for six forest types was conducted in Jinshajiang River Watershed. Results from the study showed that there existed significant differences in soil properties and water conservation function among forest types. Under the similar site condition, the pure forest of Acacia dealbata and the mixed plantations had greater water conservation function and better maintenance of soil fertility than other pure forests. Based on the total water-holding capacity of soil（0- 50cm）, the order of the water conservation function for the six forest types was： the pure forest of Acacia dealbata （2 851.8 t/hm^2） 〉 mixed stand of Pinus armandi and Alnus nepalensis （2 478.9 t/hm^2） 〉 mixed stand of Pinus yunnanensis and Pinus armandi （2 432.4 t/hm^2） 〉the pure forest of Pinus yunnanensis （2 142.8 t/hm^2）〉the pure forest of Pinus ar^mandi （1 851.8 t/hm2） 〉 the pure forest of Alnus nepalensis （1 620.3 t/hm^2）.