黔北金佛山方竹林质量及其影响因素OA

The quality of suboptimal bamboo forest and its influencing factors are both the hotspot and the difficulty in the research on bamboo forest ecology.In the central distribution area of Chimonobambusa uitilis(hereafter referred to as"CU"),which is located in 13 towns under 3 counties of Dalou mountain area in northern Guizhou province,92 sample plots(including 39 plots with limestone soil and 53 plots with yellow(brown)soil)are investigated to analyze the change rules of the quality of CU forest of different types and their influencing factors.The results showed as follows:1)The main site-soil indexes are the important factor affecting the quality of bamboo forest,and their contributions to bamboo forest quality(composed of DBH,height,density and biomass)falls in the range of 4.10%-28.02%.The percentages of significantly correlated index-pairs between main site-soil indexes and bamboo forest quality indexes in the CU forest with limestone soil,the CU forest with yellow(brown)soil and the CU forest are 28.13%,15.63%and 25.00%,respectively;2)The contribution rate of bamboo age-classes(Ⅰ-Ⅳ)indexes to the quality of CU forest is 41.77%-87.74%,and it is the main factor influencing bamboo forest quality.The significantly correlated index-pairs between the quality indexes and the bamboo age-classes indexes in the CU forest with limestone soil,the CU forest with yellow(brown)soil and the CU forest account for 76.56%,64.06%and 73.44%,respectively.The effect of bamboo age-class on the quality of different types of CU forest decreases with the increased age of standing bamboo;and 3)The contribution rate of tree-shrub indexes to the quality of CU forest ranges from 3.70%to 30.21%,and it is an indispensable factor influencing bamboo forest quality.The significantly correlated index-pairs between bamboo forest quality index and tree-shrub structure indexes and tree diversity indexes in the CU forest with limestone soil,the CU forest with yellow(brown)soil and the CU forest account for 2.50%,12.50%and 20.0%,respectively.Therefore,reasonable site selection,science-based control of bamboo age-class structure and tree-shrub structure are the key to improving the quality of CU forests.