干扰对毕棚沟生态旅游区土壤物理性质的影响

通过对四川毕棚沟生态旅游区的游径、景区公路沿线和火烧迹地等3种干扰类型的土壤物理性质进行典型抽样调查及分析，样地土壤剖面特征表现为： 3类干扰均导致样地土壤含水率呈现不同程度的下降，且表层土壤含水量远高于中下层；表层土壤较为疏松，板结程度小于中下层，踩踏更易导致表层土壤的板结；表层土壤孔隙度大于中下层，踩踏会严重降低土壤表层孔隙度，使土壤逐渐板结；土壤中下层石砾含量明显高于上层。

Effects of disturbance on soil physical characteristics in Bipengou ecotourism area

Water content,bulk density and porosity in soils sampled from tourism lane,roadside,and burning site,which represented different disturbance types,were measured in order to obtain an understanding of the effects of disturbance on the structure and function of soil ecosystem in the high-elevation ecotourism area in the Bipengou ecotourism area of Western Sichuan.Trampling along tourism lane and road and burning made soil water decrease 9.11%-22.52%,4.37%-19.75% and 5.35%-18.97%.Similarly,these disturbances made soil bulk density increase 5.26%-9.20%,32.04%-39.76% and 5.50%-9.52%.Meanwhile,these disturbances also decreased soil porosity by 9.66%-18.63%,5.24%-7.13% and 6.85%-19.62%.The results revealed that human activities in the process of ecotourism and the burning caused by poacher gave strong effects on soil physical property in soil ecosystem in the ecotourism area of Western Sichuan,and in turn influenced the structure and function of forest ecosystem.