茂兰喀斯特植被不同演替阶段的生物量和净初级生产力估算

2007年8月-2007年10月，在贵州茂兰喀斯特森林国家自然保护区内，选取其中有代表性的2个基质类型（石生群落和土壤群落）上的5个演替阶段（草本群落、灌草群落、灌木群落、次顶级常绿落叶阔叶林和顶级常绿落叶阔叶林）共10个样地，分别利用相对生长方程法、平均标准木机械布点法和树木年轮宽度值来估算群落地上生物量、地下生物量和净初级生产力。结果表明：1）喀斯特森林群落正向演替极显著增加了群落地上生物量；从石生草本群落的4．76t／hm2到土壤顶级群落的144．66t／hm2。而同一演替阶段石生群落和土壤群落地上生物量差异不显著。2）喀斯特森林群落正向演替极显著增加了地下生物量，即从石生草本群落的2．63t／hm2增加到石生顶级乔木群落的58．15t／hm2。3）总生物量随正向演替的进行而显著增加，从石生草本群落的7．39t／hm2增加到土壤顶级群落的202．15t／hm2。4）石生系列群落净初级生产力随着正向演替的进行而呈递增趋势，从草本群落的2．73t·hm^-1·a^-1递增到顶级常绿落叶阔叶林的13．58t·hm^-2·a^-1；土壤系列群落无此特征。

Biomass and net primary production in different successional stages of karst vegetation in maolan,sw china

The Karst ecosystem in southwestern China,growing in a harsh environment,is a specific type of ecosystem which can lead to land degradation and rocky desertification.The biomass and net primary production of the Karst vegetation are very difficult to measure due mostly to the Karst morphology and rigorous habitat.However biomass and NPP are the key factors in understanding the ecosystem stability in this region.Here the biomass and NPP of Karst vegetation in each successional stage were estimated in Maolan ...