为验证多树种合理配置抗御杨树天牛灾害的效果,在宁夏新华桥种苗场的试验林内,选取受光肩星天牛危害的3种配置模式的林分为样地,通过对新疆杨标准木做树干解析。比较3种配置模式中新疆杨的单株总生长量,结果除胸径外,树高和材积的总生长量均存在显著差异;单株材积总生长量大小顺序为新疆杨和复叶槭混交林>新疆杨和合作杨混交林>新疆杨纯林,即混交林中天牛对新疆杨危害不同程度地小于新疆杨纯林。比较3种模式林分在单位面积上的总材积生长量,结果为新疆杨和复叶槭混交林>新疆杨纯林>新疆杨和合作杨的混交林。同时考虑目标树种的单株材积生长量和该配置模式单位面积上的总材积生长量,新疆杨和复叶槭混交林是3种模式中最理想的。

沙棘木蠹蛾（Holcocerus hippophaecolust）和榆木蠹蛾（H. vicarious）为木蠹蛾科（Cossidae）线角木蠹蛾属（Holcocerus）的近缘种，二者形态相似，难于进行区分。本文基于线粒体CO Ⅰ 、CO Ⅱ和Cyt b基因片段，对我国不同种群的沙棘木蠹蛾和榆木蠹蛾进行遗传差异分析，以探讨二者之间的亲缘关系。遗传距离分析表明，沙棘木蠹蛾和榆木蠹蛾在CO Ⅰ、CO Ⅱ和Cyt b3个片段的遗传差异分别为0.009，0.001和0.062，仅相当于二者种内遗传差异均值范畴，远远低于同属的种间遗传距离均值，表明两种昆虫之间存在高度的遗传相似性。两种木蠹蛾在3个基因位点共检测到6个共享单倍型，占单倍型总数的四分之一，且共享单倍型分布不受地理距离限制，显示两个种的种群之间尚未完全分化。系统发育树分析中，沙棘木蠹蛾和榆木蠹蛾在3个基因序列均未构成独立分支，而是形成了混合集群。介于沙棘木蠹蛾和榆木蠹蛾之间极高的遗传相似性，对二者之间的亲缘进化关系进行了讨论。

The damage characteristics and spatial distribution of Sphenoptera sp. larvae population on Artemisia ordosica were analyzed by using biostatistics and geostatistical methods in order to effectively control the insect and to further study the damage characteristics and spatial distribution of the population. The results showed that the larvae of Sphenoptera sp. distributed on the whole plant, but showed a trend of increasing first and then decreasing from top to bottom. However, about 95% of the larvae were concentrated in the roots 8 cm underground. Four theoretical models (spherical, exponential, Gaussian, and linear) were used to represent the observed spatial correlation of larvae and it was found that the spherical isotropic model fitted the best with 3.12 m spatial dependence and 0.98 intensity of local spatial continuity. These indicated that the spatial distribution of larvae followed an aggregation distribution, and the aggregation points were primarily distributed in different areas of the woodland and then spread to the entire woodland.