摘要
研究了松黄叶蜂幼虫在林内和树冠内南北方位及各小区的分布。通过聚集指标测定 ,幼虫在林内 ,树冠南北方位 ,上、中、下三层均为聚集分布。树冠内南中和北上层小区为均匀分布 ,其余小区为聚集分布。适合于松黄叶蜂的抽样方法为分层抽样 ,最佳抽样区为树冠下层。
The distribution on Neodiprion sertifer larvae in forests and crowns was studied.Through investigation on aggregated index,the larvae distribution in the forests,crown exposure (south and north) and different layers (upper,middle and lower) was aggregated,the plots in the mid south and upper north of crowns belonged to uniform distrbution,the rest plots to aggregate distribution.The tractified sampling is suitable to N.sertifer study,and the optimum sampling plots are at lower layer of the crown.
出处
《陕西林业科技》
北大核心
2000年第3期25-29,共5页
Shaanxi Forest Science and Technology
基金
陕西省科技攻关项目
