Studies On The Clonal Population Degradation And Restoration Mechanism Of Qiongzhuea Tumidinoda

Population ecology of clonal plants is one of the major research fields of plant ecology. The boom of bamboo clonal population ecology not only enrich the research contents of population ecology of clonal plants, but also lay the foundation for the theory of culture techniques of bamboo forests. Qiongzhuea tumidinoda is one of the two nationally third-grade protection rare bamboo species, unique in the Southwest of China and with great values of ecological economy and culture values. Because of long period of human interference activities such as excessive bamboo shoot harvesting, there exists severe population degradation. Up to now, it's still not clear of the reasons, process and its effects of the degradation of bamboo clonal population, and no literature of research has been reported on the restoration techniques and measures for the degraded population. Guided by the theories and methods of bamboo Clonal Population Ecology, Interference Theory and Restoration Ecology, the study is carried out on two aspects, the degradation and the restoration of the clonal population of Qiongzhuea tumidinoda. It explores the basic law for the degradation of population from the influences of human interference activities on the degradation the populatioin to the changes of the biomass structure and the number dynamics of the degraded population, while the restoration process for clonal population of Qiongzhuea tumidinoda natural forests and the restoration mechanism for the clonal population of Qiongzhuea tumidinoda plantations are explored by different technical measures.1. Human interference is the major impetus for the degradation of the clonal population of Qiongzhuea tumidinoda. In the natural distribution area of Qiongzhuea tumidinoda in Northeast Yunnan, the long-term comprehensive effects by the interference body in specific district makes the phenomenon of degradation of the clonal population of Qiongzhuea tumidinoda universal. Excessive loggings in the humid evergreen broadleaf forests of the mountainous area cause the disappearance of the ecological environments for Qiongzhuea tumidinoda and then indirectly lead to the degradation of the clonal population. While looting-style bamboo shoot harvesting frequently destroy the normal growth pattern of Qiongzhuea tumidinoda and aggravate the degradation. The decrease of crown canopy of the upper storey is the main reason for the dwarf-growth trend of the clusters. Gradient-distribution pattern for human interference is formed based on the enlargement of human activity scope and the village as the activity center.2. Disorder of the biomass structure and shrinking of the propagation module are main features for degradation of the clonal population of Qiongzhuea tumidinoda. The difference of distribution of biomass on different aged clusters of the degraded clonal population is...