森林衰退病研究综述

Review on Forest Decline

森林衰退病 (Forestdecline)是由若干可交替的并特别有顺序的非生物和生物因子的相互作用而引起 ,并呈现渐进的全体的退化 ,最终导致林木死亡的一类病害。衰退症状包括生长速度慢 ,叶稀疏、小型及歪曲 ,经常有缺绿现象 ,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。研究中存在着将各因素过分简单化的现象。森林衰退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。

The term forest decline refers to premature progressive loss of vigor and health and at last to die. Forest decline caused primarily by chronic stress or sequential insults to the tree nonorganisms and organisms. Symptoms of decline include slow growth, sparse and/or undersized, often chlorotic leaves, premature leaf margins, premature display of autumn color, premature leaf drop. However, the trend of simplified the caused factors are often observed. Currently, most of the works focus on finding the main causes and relationship among the factors.