不同坡位对天然水竹生长的影响

水竹是我国优良的笋用竹和材用竹,是经济效益和生态效益兼具的竹种.在一定海拔范围内,坡位是影响林木生长的关键因子,它代表着水分、养分等环境因素的生态梯度变化,直接影响着水肥的再分配.本研究对海子坪省级自然保护区天然水竹林在不同坡位的生长情况进行调查,结果表明:坡位对水竹无性系种群密度、产量、胸径和高度有显著影响,即随着坡位的上升水竹无性系种群密度逐渐变小,而随着坡位的下降水竹无性系分株呈现纤细化和低矮化的趋势.

Effects of Different Slope Position on Growtb of Natural Phyllostachys heteroclada

Phyllostachys heteroclada is a shoot and timber bamboo with both economic and ecological benefit.Within some certain ranges of altitude,the slope position is usually a key limitation for tree growth due to the redistribution of water and nutrients in soil in the different slope positions.The growth of Ph.Heteroclada in the different slope positions of hill in Haiziping Nature Reserve located in Yunnan province was investigated in this paper.The results showed that the slope position had a significant effect on the population density,yield,DBH and height of Ph.Heteroclada.With the increase of altitude of slope position,the population density of Ph.Heteroclada was decreased,but the culms of Ph.Heteroclada was trend to be slimmer and lower in the downhill slope position.