西南桦、山桂花、肉桂人工林林下物种多样性和生物量对比研究

通过样方调查法分别对普文试验林场林龄为15年的3种人工林群落进行了调查,分析了3种森林群落的物种多样性和生物量。结果表明西南桦林的物种多样性指数和均匀度指数都是最大,分别为3.06和91.82%。生物量最大的也是西南桦林,其值为115.82 t·hm-2,年增长量为7.72 t·hm-2,远高于当地天然热带次生林的4.184 t·hm-2。这说明西南桦较其他阳性树种具有更快的生长速度,表现出了较高的生产能力,加之它又是一个乡土树种,因此可在云南热区造林项目中大量推广应用。

A Comparative Study of the Biodiversity and Biomass Among the Undergrowth of Betula alnoides,Paramichelia baillonii and Cinnamomum cassia

Sample plot investigations were conducted on three kinds of artificial forest community of 15 years in Puwen Experimental Forest Farm, and analysis was made of the diversity and biomass of the three kinds of forest community species. And the results showed that the biodiversity index and evenness index of Betula alnoides were the largest, respectively 3.06 and 91.82% ; the biomass of Betula alnoides was also the largest, much higher than th its value was 115.. 82 t· hm^-2, and its annual growth rate was 7.72 t· hm^-2 much higher than the local natural tropical forest with 4. 184 t· hm^-2. As compared other species, Betula alnoides had a higher growth rate, showing a high production capacity, and as species, it could be applied in the tropical afforestation project in Yunnan Province. positive a native