The Edge Effect Of Bamboo Forest And Different Upper Slope Forest In Mountains

In this study, we focused on the differences and intensity of the edge effect in different type of mixed plaque, by investigating the productivity of bamboo, understory vegetation species diversity and soil nutrients in different types of mountains, the broad-leaved forest in upper slope and bamboo forest in lower slope of mountain(?), the Cunninghamia lanceolata forest in upper slope and bamboo forest in lower slope of mountain(?), the Castanea henryi forest in upper slope and bamboo forest in lower slope of mountain(?), and the bamboo forest of mountains(?).There were edge effect of productivity of bamboo, understory vegetation species diversity and soil nutrients in different types of mixed plaque, and the intensity of edge effects were obvious of productivity and understory vegetation diversity, confirmed the truth that mixed plaque have significant influences on them. The edge effect and intensity of edge effects were different in different types of mixed plaque. The type of management pattern?and?were better than the management pattern ?.The main conclusions are as follows:(1) The productivity of bamboo in the type of mixed plaque were higher than the type of bamboo forest. The mean diameter at breast height of bamboo in the type of mixed plaque were 8.35~9.76 percent above the management pattern ?, especially in the patchy ecotones, were 11.09~27.72 percent above the transect of the management pattern ?; the height of bamboo in the type of mixed plaque were 3.86~8.87 percent above the management pattern ?; the average biomass of bamboo in the type of mixed plaque were 7.11~16.43 percent above the management pattern ?. There were edge effects in the different types of mixed plaque of sampling mountains, and the edge effects were different by them. There were significant differences among the different type of sampling mountains and transects, after doing multiple linear regression analysis, a report had been given as follows: the location of transects in different type of mixed plaque all have significant influences on productivity of bamboo. The management pattern ? and ? have positive and significant influences on productivity of bamboo.(2) There did have edge effects of understory vegetation species diversity in different types of mixed plaque, the distance from the edge of patchy ecotones have significant influences on understory vegetation species diversity, and the trend in different types of mixed plaque were also different. There were significant differences of understory vegetation species diversity among the sampling mountains, and the main impact factor were the type of the upper forest, NLS and management measures.(3) There were edge effects of soil nutrients in the different types of mixed plaque of sampling mountains, but were not significant. There were significant differences among different type of mixed plaque, and different type of mixed plaque all have significant influences of soil nutrients. And the highest overall level of soil nutrients was the management pattern ?, hydrolyzable nitrogen content were 26.29~129.18 percent above the management pattern ? and ?, and soil moisture above 21.81~228.73 percent, soil organic matter above 23.01~22.78 percent, and there were not have significant differences among the transects. The soil organic matter and soil moisture have significant influences of productivity of bamboo in six sampling mountains.(4) The different types of mixed plaque have different intensity of edge effects, and have different influences of productivity of bamboo, understory vegetation species diversity and soil nutrients. The management pattern ? and ? have positive and significant intensity of edge effects on productivity of bamboo and understory vegetation species diversity, but have negative and weak intensity of edge effects on soil nutrients.(5) The management pattern ? have negative and weak intensity of edge effects on productivity of bamboo, understory vegetation species diversity and soil nutrients, and this management pattern have negative influences on understory vegetation species diversity and maintaining soil fertility, so we does not promote this management pattern in the production and management.