广州市城郊森林生长状况调查

以广州市城郊森林为研究对象,选取面积为400 m2的标准地34块,进行了森林生长状况调查。调查结果显示,广州市城郊森林树种组成较丰富,以混交林为主;大部分林分为密林,疏林地极少。共调查树种45种、1 215株,结果为乡土树种占80.2%,表明广州市城郊森林植物种类以乡土树种为主;其中主要优势树种为马尾松、马占相思、荷木等。调查所有乔木的平均胸径为15.3 cm,平均树高为8.9 m,以胸径10~20cm、树高5~10 m范围数量居多,表明广州市城郊森林幼龄林多于成过熟林。从林木生长状况看,大部分树种生长状况良好,少数树种如马尾松、南洋楹、桉树、黎蒴、秋枫等局部受到病虫危害。

Survey ofForest GrowthState in SuburbanGuangzhou

Forests in Suburban Guangzhou were taken for the survey of forest growth state by selecting 34 standard area of 400 m2 . The survey results showed that forests of suburban Guangzhou have a rich species composition, and mix forests take the dominant position; most of them are dense forest and woodland is rarely found. This research investigated 1215 plants from 45 species, and 80. 2% of them are native species. This result indicated that native trees constitute the majority of Guangzhou＇s suburban forest, and dominant species include Pinus massoniana, Acacia manglum, Schima spp. etc. The average DBH of all trees is 15.3cm. The average height is 8.9m. The DBH of most trees are at the range of 10 -20cm, the height 5 - 10m. This result tells us young forest is more than mature forest in Guangzhousuburb. As for the tree growth state, the majority of the species is in good condition, but a few species such as P. mussoniana, Albizia falcataria, Eucalyptus spp. , Castanopsis ftssa, Bischofiajavanica, etc. are subject to pest damage partially.