广西岩溶植被演替过程中主要小气候因子日变化特征

选择广西不同气候带下具有典型性和代表性的岩溶区作为研究区域,调查和监测了岩溶植被演替过程中主要小气候因子的日变化特征。结果表明,在石荒漠阶段和草丛阶段,群落光照强、土温和气温高、空气相对湿度低,时间波动比较明显:灌丛阶段群落冠层以下的照度、气温均较低,随时间变化的幅度不大,而冠层以上的光照强度和气温均出现了大幅上升,而且随时间变化的幅度较大;落叶阔叶林阶段和常绿落叶阔叶混交林阶段群落内部的照度、气温及土壤温度均大幅降低,空气相对湿度保持在较大水平,主要小气候因子的时空变化比较平缓。主要小气候因子的时空动态与群落结构和群落种类组成特征密切相关。

The dailv dvnamics of primary microclimatic factors in the different successional of karst vegetation in Guangxi Pmine

The daily dynamics of primary microclimatic factors in the succession of karst vegetation were studied within therepresentative karst regions which locate in different climatic zone, Guangxi Province. The results indicated that the lightintensity, air femperehue and soil temperature of the rocky desertification and herbage stages were high, and the relativehumidity (RH) was low, moreover the variation of the microclimatic factors was obvious; the light intensity and air temperatureunder canopy of the shrub stage were lower and little variation, while it was reverse over the canopy, in the deciduous broadleafforest and evergreen and deciduous mixed broadleaf forest stages, the light intensity, air fempenhre and soil temperature weregreatly decreased as well as the RH was higher, and the daily dynamics of primary microclimatic factors was stable. Thedynames of primary microclimatic factors was mainly related to the community structure and species components.