四川中亚热带扁刺栲_华木荷群系不同演替阶段林内小气候的比较

COMPARATIVE STUDY ON MICROCLIMATE OF VEGETATION OVER DIFFERENT SUCCESSIONAL STAGES OF CASTANOPSIS PLATYACANTHA-SCHIMA SINENSIS FORMATION IN THE CENTRAL SUBTROPICAL ZONE IN SICHUAN PROVINCE

对四川瓦屋山地区扁刺栲 (Castanopsisplatyacantha)_华木荷 (Schimasinense)群系不同演替阶段 (灌木、10年和 40年生扁刺栲_华木荷群落 )的林内小气候进行了连续 2年的定位观测研究。主要结果是 :40年生的扁刺栲_华木荷群落内的地温、空气温度、相对湿度、光照强度和降雨等气候指标的数量大小及其变幅最低 ,10年生的次之 ,灌丛的最大。这些结果暗示了扁刺栲_华木荷群落在恢复演替过程中 ,随着植被的发育和各层次结构的完善 ,林内小气候环境朝着更为阴、凉、冷、湿的环境演进 ,且其波动性减弱 ,稳定性增强。

Microclimates within the vegetation of different successional stages of Castanopsis platyacantha-Schima sinensis formation including shrub and 10-year and 40-year C. platyacantha -S. sinensis forests located on Wawu Mountain in Sichuan province were continuously observed in situ. The main results may be summarized as follows: both seasonal and daily variations in microclimate, including soil and air temperatures, relative humidity, light intensity and precipitation, within shrub and 10-year and 40-year C. platyacantha-S. sinensis communities are significantly different. Generally, seasonal and daily variations of a given index of microclimate are smallest in 40-year C. platyacantha-S. sinensis forest and greatest in the shrub phase. Also, the indices are the lowest in 40-year C. platyacantha-S. sinensis forest and highest in the shrub phase; levels are intermediate in 10-year C. platyacantha-S. sinensis forest. The above results suggest that microclimatic conditions within C. platyacantha-S. sinensis forest over the course of succession develop towards environments with much more cloudy, cold and moist properties. Fluctuation of the microclimate is decreasing, leading to increased stability of the microclimate.