森林群落覆盖度与物种多样性及物种联结性的关系研究

在样方调查基础上,分析了广东南亚热带森林不同阶段的森林群落的物种多样性及物种联结性和群落覆盖度的关系.随着演替的进展,森林群落的物种多样性指数和森林覆盖度有着密切的关系.森林群落覆盖度增加,使群落里的生境条件变得温和,有利于物种的增加.物种的增加又使群落里物种间竞争更加激烈,物种间负联结对数增加,阔叶树种间占领空间能力不断增强.这主要表现在阔叶树种覆盖度总和的增加和不断削弱了马尾松在群落中的重要位置.森林覆盖度指数按幂函数Y=28379X1.5624增加.

Study on the Relationship between the Species Diversity,Association and Cover Indexes or Forest Communities

Based on the investigation and statistics data of the 4 plots of total area 3 700 m2 in 4 different stage foest communitites (among which the 10 age community is 100 m2,28 age community is 1 200 m2,50 age community is 1 200 m2 and 100 age evengreen broadleaved forest is 1 200 m2), this paper dealswith the relationship between the species diversity, spotes association and cover indexes of these different stage forest communihes in Guang Dong Province. The results show that the species diversity increases and species compete strongly among the different species (the species negative association increases)with the increase of forest community cover indexes. The space-occuping capability of broadleaved tress becomes stronger along with the progressing of the forest community succession. The relationship between the age (Y ) and cover index (X) of the different stage forest communities is Y = 28. 379 X1.5624.