森林衰退病 (Forestdecline)是指由一系列按特定顺序出现的生物和非生物因素的综合作用而导致树木生长势或生长潜能显著下降 ,最终导致死亡的一类病害 .衰退的症状包括生长速度慢 ,叶稀疏、小型及扭曲 ,经常有缺绿的现象 ,叶缘变褐色 ,叶片过早变黄 ,过早脱落 ,直至死亡 .衰退病的起因有非生物因素和生物因素 .研究中存在着把各因素过分简单化的现象 .森林衰退病研究的主要方向是找出主导因素及各因素之间的相互关系 .即多因素的综合作用 Forestdecline refers to a group of diseases that result in a significant decrease in growth potential or growth potential of trees resulting in death from the combined effect of a series of biological and abiotic factors in a specific order.The symptoms of decline include slow growth , Leaves sparse, small and twisted, often lack of green phenomenon, the edge of the brown, leaves turn yellow premature, premature off until death.Decay disease causes non-biological and biological factors exist in the study there is a The simplistic phenomenon of all factors.The main direction of the study of forest decline disease is to find out the dominant factor and the interrelationship among the various factors