Analysis of undergrowth plant diversity of rubber plantations in Mengla County,Xishuangbanna,Yunnan Province
In order to explore the species composition and diversity of plants in the rubber plantations of Mengla County,Xishuangbanna,Yunnan,China,94 plant quadrates(20×20 m)and 20 soil quadrates were arranged for observation in the understory of the rubber plantations in Mengla County to analyze the effects of environmental and spatial factors on the species distribution and plant diversity in the rubber plantations.The results showed that there were 87 families,197 genera and 300 species of understory plants in the rubber plantations in Mengla County,and that the dominant species were Aporusa dioica,Indocalamus latifolius,Pueraria lobata and so on.The contents of total nitrogen,phosphorus and potassium in the 20 soil quadrates varied moderately,and their highest contents were 1.09%,0.17%and 2.65%,respectively.The analysis of factors influencing the distribution of plant species and dominant species by using the RDA method showed that topography had significant effect on the distribution of dominant species,and that soil total phosphorus and slope had significant effects on plant species distribution(P<0.01).In the analysis of plant diversity,the effect of slope on plant diversity was significantly higher than that of other factors(P<0.05).Simpson(D)index and Shannon-Wiener(H)index were the highest at the slope>35°,and the fit degree was higher in regression analysis.The D and H were higher at the altitudes greater than 600 m,and species richness(S)was higher at the elevations between 600 m and 700 m than at the other elevations.The plant species richness was the highest in the rubber plantations at the age of 8～14 years old.The plant species under the rubber plantations in Mengla County are abundant,but the plant diversity is poor due to artificial disturbance.The plant diversity under the rubber plantations can be increased through reasonable management and control,which is conducive to ecological recovery.
Mengla Countyrubber plantationplant diversityRDA analysisdiversity index
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NSTL
万方数据
