上海杨树生态林病虫害发生状况及其综合治理

对上海生态林病虫害及生态林存在问题进行了调查研究,并对其病虫害的发生原因进行了分析。调查表明:上海城市生态系统中的植物种类相对稀少,林分结构较为单一,缺乏病虫害天敌;上海城市森林受人为因素干预程度大,受城市“热岛效应”的影响明显。病虫害发生的主要原因为:城市绿地面积和绿化树种盲目增加,打破了原来城市森林生态环境的平衡发展;不合理引进外来树种,而且树种种植结构不合理或管理粗放,导致一些外来的或原次要的病虫害严重发生。针对存在的问题提出上海杨树生态林病虫害综合治理策略。

Integrated Pests Management Strategy to Ecological Forest in Shanghai

The diseases and pests in ecological forest in Shanghai were studied.The characteristics of diseases and pests in ecological forest were analyzed.The result showed that vegetational varieties in ecological forest in Shanghai is relatively shortage,the plantation structure is too simple,and it is lack of the natural enemy.The ecological forest easily is affected by Tropical Island Effect and artificial factor.The major factors of the pests prevalence were studied as follows:the balance of urban ecosystem was broken by increasing plantation area,exotic species were introduced unsuitable,unreasonable stand structure and extensive management existed.Which resulted in the occurence of some foreign or secondary pests' damage to the forest.On this base,some comprehensive pests management strategies to ecological forest in Shanghai were put forward.