澜沧江糯扎渡季雨林厚皮树+家麻树群落的研究

根据5个20m×25m样地的调查资料,对分布于澜沧江糯扎渡河岸山地,以厚皮树、家麻树为优势种的季雨林群落进行了分析研究,结果显示:(1)该群落乔木层以落叶成分厚皮树和家麻树为优势种,层间以常绿的大型木质藤本云南翅子藤为特征;(2)在群落2500m2样地内,共计维管束植物72种,隶属于38科65属;其中有乔木25种,草本植物25种,灌木10种和层间藤本植物12种;(3)综合5个样地后计算所得群落乔木层树种丰富度为25种,Shannon-Wiener指数为2.9010,Pielou均匀度指数为0.9012,Simpson指数为0.9346,在群落中,随着乔木径级的增大,个体数和种数逐渐减小;(4)该群落主要以高位芽植物为主,并以中高位芽植物为优势,占所统计总种数的35.8%;(5)该群落中落叶种类占总种数的62.5%,中叶占47.2%,小叶占41.7%,单叶占69.4%,纸质叶占61.1%,全缘叶占56.9%;(6)该群落的物种数/样地面积关系曲线显示在取样面积1000m2时开始趋于平缓,意味着该取样面积可以考虑作为群落最小取样面积。

Study on the monsoon forest of Lannea coromandelica + Sterculia pexa community in the valley of lower Lancang River

The less known monsoon forest on banks of lower Lancang River was studied based on sampling plot surrey.The following results are given:(1)The forest is dominated by deciduous tree species Lannea coromandelica and Sterculia pexa,and evergreen liana species Loeseneriella yunnanensis;(2)72 vascular plant species of 65 genera in 38 families were recorded from a sampling area of 2 500 m2,of which 25 are tree species,25 are herbaceous species,10 shrub species and 12 liana species;(3)Shannon-Wiener diversity index is 2.901 0,Pielou Evenness 0.901 2,Simpson index 0.934 6 for tree species;(4)The forest is dominated by phanerophytes,of which meso-phanerophytes make up 35.8% of the total species;(5)Deciduous species make up 62.5% of the total species,and the forest dominated by species with mesophyllous leaves(making up 47.2%),and species with simple and entire leaves;(6)The species/area curve shows that it is flatten at 1 000 m2,which could be the minimum sampling area for the forest.