Effects of Topographical and Edaphic Factors on the Distribution of Plant Communities in two Subtropical Karst Forests,Southwestern China  

作　　者：ZHANG Zhong-hua HU Gang NI Jian 

机构地区：[1]School of Chemistry and Life Science,Guangxi Teachers Education University [2]Key Laboratory of Beibu Gulf Environment Change and Resources Utilization of Ministry of Education,Guangxi Teachers Education University [3]State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences [4]Department of Environmental Science,East China Normal University

出　　处：《Journal of Mountain Science》2013年第1期95-104,共10页山地科学学报（英文）

基　　金：supported by the "Hundred Talents Program" of the Chinese Academy of Sciences (to Jian Ni);the National Basic Research Program (No. 973) of the Ministry of Science and Technology of China(Grant No. 2013CB956704);the Scientific Research Foundation of the Education Department of Guangxi Zhuang Autonomous Region (Grant No.201106LX296)

摘　　要：Relationships between topography,soil properties and the distribution of plant communities on two different rocky hillsides are examined in two subtropical karst forests in the Maolan National Natural Reserve,southwestern China.Surveys of two 1-ha permanent plots at each forest,and measurements of four topographic and thirteen edaphic factors on the slopes were performed.Twoway Indicator Species Analysis(TWINSPAN) and Detrended Canonical Correspondence Analysis(DCCA) were used for the classification of plant communities and for vegetation ordination with environmental variables.One hundred 10m×10m quadrats in each plot were classified into four plant community types.A clear altitudinal gradient suggested that elevation was important in community differentiation.The topography and soil explained 51.06% and 54.69% of the variability of the distribution of plant species in the two forest plots,respectively,indicating both topographic factors(eg.elevation,slope and rock-bareness rate) and edaphic factors(e.g.total P,K and exchangeable Ca) were the important drivers of the distribution of woody plant species in subtropical karst forest.However,our results suggested that topographical factors were more important than edaphic ones in affecting local plant distribution on steep slopes with extensive rock outcrops,while edaphic factors were more influential on gentle slope and relatively thick soil over rock in subtropical karst forest.Understanding relationships between vegetation and environmental factors in karst forest ecosystems would enable us to apply these findings in vegetation management strategies and restoration of forest communities.

关 键 词：Karst forest Classification Ordination Edaphic factor Topography Rock outcrop 

分 类 号：S718.5[农业科学—林学]