广西林业科学2018，Vol.47Issue(1)：29-35,7.
桂西南蚬木林凋落物和表土理化性状分析
Physicochemical Properties of Litter and Surface Soil in Excentrodendron hsienmu Forest in Southwestern Guangxi,China
摘要
Abstract
To protect natural Excentrodendron hsienmu community,physicochemical properties of litter and surface soil in six E.hsienmu forests were investigated in Southwestern Guangxi.Results showed that signifi-cant differences existed among different E.hsienmu forests in such indexes as biomass,maximum water-hold-ing rate,maximum water-holding capacity,maximum retain capacity,effective retain capacity of litters, and the average content were 12.56 t/hm2,176.87%,21.78 t/hm2,16.35 t/hm2,13.08 t/hm2,respectively. The water-holding capacity and water-holding rate of litters changed logarithmically,while the water-absorp-tion rate assumed a power function of soaking time.The average contents of organic carbon,total N,total P and total K of litters were 408.84 g/kg,14.92 g/kg,0.63 g/kg and 1.06 g/kg,respectively.These indexes ex-cept for organic carbon were significantly different among different forests(P<0.05).Topsoil bulk density (0 to10 cm layer)was only 0.81 g/cm3,and non-capillary porosity,capillary porosity,total porosity, non-capillary water-holding capacity,capillary water-holding capacity,and maximum water-holding capaci-ty were 7.49%,50.02%,57.51%,82.37 t/hm2,500.23 t/hm2and 575.11 t/hm2,respectively.Significant differences of these indexes occurred among different forests(P< 0.05). The change regularity of soil wa-ter-holding capacity was the same as the corresponding porosity.Soil pH was weak alkaline with an average of 7.42.The average content of soil organic matter,total N and total P at level one were 145.25 g/kg,7.03 g/kg and 1.14 g/kg,respectively.The average content of total K at level five was 5.85 g/kg.These indexes were sig-nificantly differenct among different forests(P<0.05).In general,E.hsienmu forest played a functional role in water conservation and improvement of soil conditions.关键词
蚬木/喀斯特山地/凋落物/土壤/持水量/养分元素Key words
Excentrodendron hsienmu/karst areas/litter/soil/water-holding capacity/nutrient element分类
农业科技引用本文复制引用
何琴飞,彭玉华,欧芷阳,谭一波,郑威,申文辉,何峰..桂西南蚬木林凋落物和表土理化性状分析[J].广西林业科学,2018,47(1):29-35,7.基金项目
广西林业科技项目(桂林科字[2014]02号) （桂林科字[2014]02号）
广西科技计划项目(桂科AB16380300) （桂科AB16380300）
广西优良用材林培育重点实验室自主课题(14B0101) （14B0101）
广西自然科学基金项目(2014GXNSFAA118132) （2014GXNSFAA118132）
