胡杨林下不同混交模式对土壤肥力的影响

Influence of Different Patterns of Mixture at the Upper and Lower Sections of Populus Euphratica Plantation on Soil Fertility

对胡杨林下混交柽柳、芦苇、罗布麻及胡杨林纯林土壤肥力的测定结果表明:不同混交林年凋落量有明显差异;成林胡杨林混交后,林地土壤水分状况、孔隙状况、土壤结构及渗透性能均得到不同程度的改善,而且林地表层土壤养分含量增加。不同混交林改良土壤肥力效果排序为:混交柽柳>混交芦苇>混交罗布麻>胡杨林纯林。其中胡杨林下混交柽柳是值得推广的造林模式。

the soil fertility of Populus euphratica plantations mixed with Tamarix ramosissima,Phragmites australis and Apocynum venetum in the lower section and pure plantation has been measured. The results of soil fertility measurement indicate that the annual litterfall of different mixed plantations varies significantly. After afforested Populus euphratica plantation is mixed,the conditions of soil moisture,porosity,structure and permeability in the forest land will be improved a varying extent and the nutrient content of the surface soil will also increase. The performance of different mixed plantations in improving soil fertility is ranked in the following order： plantation mixed with Tamarix ramosissima,plantation mixed with Phragmites australis,plantation mixed with Apocynum venetum and pure Populus euphratica plantation. Among these patterns of mixture,mixing Tamarix ramosissima in the lower section of Populus euphratica plantation is a practicable plantation model for extensive application.