水竹林留养适宜年龄防止竹笋倒伏试验研究

EXPERIMENTAL RESEARCH ON RETAINED AGE OF PHYLLOSTACHYS HETEROCLADA STAND FOR PREVENTION OF SHOOT LODGING

根据安徽省舒城县水竹林留养1～7年生竹14个试验区连续4年观测资料,拟合出水竹不同留养年龄与倒笋及其有关因子间的关系的回归方程式20个。研究结果表明,降低水竹倒笋的适宜留养年龄为,留4a砍5a。水竹倒笋数与发笋数、成竹量和保留母竹株数有一定关系。用尝试法以水竹林倒笋率最低时所保留株数来调整择伐量,将水竹林年龄一株数改善成均匀分布,保持利用均衡和收获稳定。各留养年龄年均每公顷增产量和增产值分别为3855kg和2310元。

Investigations on 14 experimental plots of retained 1~7 years Phyllostachys heteroclada stand for prevention of shoots lodging in Shucheng county, Anhui province resulted the relationship between the retained bamboo ages and shoot lodging, as well as sprouting shoot adulting bamboo and mother bamboo and 20 regressive equations were also derived. The result showed that the retained ages could not lower than 4 years, and cut 5 year ones in the stand. Shoot lodging in Ph. heteroclada stand and the amount of sprouting shoots,adulting bamboos,and mother bamboos had certain relations. Selected cutting of Ph. hetroclada was determined by trial and error method, and age-amount structure was regulated and improved into even distribution. The annual yield of various retained ages will increased to 3 855 kg/hm^2 ·a and 2 310 yuan/hm^2·a.