“城-郊-乡”森林生态样带植被变化梯度分析

GRADIENT ANALYSIS OF FOREST VEGETATION ALONG AN URBAN RURAL TRANSECT IN NEWYORK

沿纽约市“市区－郊区－农区”１４０ｋｍ森林生态样带，对９个样地１９个样方的森林植被进行了研究。植被组成和结构沿样带变化明显，分异出城区森林、郊区森林和农区森林等不同类型，优势种替代明显，植物种类也形成了不同的生态类型。植被的梯度变化与人类活动密切相关，城市化对植被有重要影响。森林生态样带是研究人类活动对植被影响的好手段。

Quercus forest vegetation from 19 samples of nine sites along an urban suburban rural transect (140km) in New York were analyzed. The composition and structure of vegetation varied greatly from urban to rural. Three types of forests,urban forest,suburban forest and rural forest can be identified. Species ecotypes were obvious along the transect. Vegetation was closely related to human activities along the transect and urbanization was a key factor affecting forest. Forest ecological transect is an advanced way to study the relationship between vegetation and human activities.