A Study of Vegetation Community Succession in the Rocky Desertification Vegetation Recovery Area in the Zhongliang Mountains of Chonqing
The Zhongliang Mountains,a vegetation restoration area in the Karst rocky desertification regions of Chongqing,were taken as the research area.In combination with two-way indicator species analysis (TWINSPAN) and detrended canonical correspondence analysis (DDCA),the method of spatial sequence instead of time successional sequence was used to quantitatively study the succession stages,succession series,community characteristics,changes in species composition in the succession process and the relationship between succession and environment in the research area during vegetation restoration.The results showed that in the Zhonglian Mountains the succession of vegetation restoration was divided into nine stages and abode by the general rules of xerophytic progressive succession-from herb community to shrub community to arbor community.Affected by the special habitat of soil and lithology in the Zhongliang Mountains,three major soil climaxes were formed here-mainly the Pinus massoniana community,the cypress community and the shrub community,the last consisting of drought-and infertility-tolerant shrub species.The obvious differences between the artificially restored vegetation and the naturally recovered vegetation resulted in the formation of two distinct succession series-a natural restoration succession series and an artificial auxiliary succession series.Compared with plantations,the community of natural recovery had higher species richness and more complicate functional group composition-arbor community ＞ shrub community ＞ herb community.It was true that the succession of artificial auxiliary sped up the process of vegetation succession,but it had the poorest ecological function.The sorting results of DCCA were close to those of TWINSPAN,and the samples of similar species composition and environmental conditions were gathered,which was thought to be the result of the long-term adaptation of vegetation to environment.
the Zhongliang Mountainsrocky desertification vegetationrecovery successionTWINSPANDCCA
NETL
NSTL
万方数据
维普
