【摘要】 <正> 毛竹林的地下结构是毛竹林群体结构的重要组成部份。本文拟探讨毛竹地下鞭根系统的分布与结构特点,以寻求提高单产的途径。一、调查方法与内容在贵州赤水地区选择立地经营水平、大小年等条件基本一致的地段,将毛竹林按疏、密不等设立样地,并在调查范围内均匀布设四个调查点,12更多还原

【Abstract】 In this paper the relationship between the underground structure and the yield of bamboo stands is analysed. The analysis is based on the data collected through a survey of both the above and the under ground parts of bamboo stands. Data were collected from thirty-six column soil on 12 sample plots, The regressin equation of vertical distribution amount of the rhizomes referring to the bulk density of soil can be obtained as: Y=92, 049266.7869x, The result shows that the vertical distribution amount of rhizomes of Phyllostachys pubescens is in inverse proportion to the bulk density of soil. Generally speaking if the bulk density of soil is less than 1.15 it is favourable to the growth of rhizomes. Most of the rhizomes are distributed in the 0-30 cm layer of soil. They account for 80 percent of the total amount and they are mainly distributed in the 10-30 cm layer. It has been found that there are a large number of stumps in bamboo stands, about 108 per mu. These stumps occupy as much as one tenth of the forest laud space growth of the rhizomes and the development of bamboo shoots. In terms of the above ground part, the bamboo age structure is the main factor that affects the yield. Therefore, it is very economic and effective to regulate the bamboo age structure and improve the growth conditions for raising the yield per unit area,更多还原