摘要
通过对马尾松人工模拟剪叶,在30%以上时,对当年和翌年材积生长量都有影响。剪叶越多,影响越大,平均生长率减少4.7%,影响达2年。瑞安市马尾松毛虫3级以上虫灾危害松林一次,平均每年每公顷损失木材蓄积量0.7762m^3(第1年0.4374m^3,第2年0.3389m^3)、松针重量7.086吨,损失价值541.58元。本试验为制订防治指标和科学管理提供依据。
Artificial method of scissoring off pine needles of Pinus massoniana Lamb.simulating the damage of Dendrolimus punctatus Walker was used in this test. The results showthat when the pine losts over 30% needles of all, the increment of stock in the same year andthe next year will be affected to a certain degree. The more the needles scissored off, the deeperthe affection. The influence lasts for two years With an average decreased growth rate of4.7%. In Ruian, every one time the pine forest suffers the damage of Den. punctatus at/overGrade Ⅲ, it would lost stock volume 0.7762 m^3/ha (0.4374 m^3/ha in first year, 0.3389 m^3/hain second year), and needle weight 7.086 tons/ha, causeing an economic lost of 541.58 RMByuan/ha. This test item provides scientific basis for laying down controlling index as well asscientific management.
出处
《浙江林业科技》
北大核心
1991年第6期23-26,共4页
Journal of Zhejiang Forestry Science and Technology
