中国亚热带杉木人工林生态系统的小气候及其形成机制(英文)

该文通过位于湖南西部的森林生态系统研究站的长期定位观测 ,研究了杉木人工林成熟林、间伐林和幼林的小气候特征 ,在分析人工林生态系统环境能量的基础上 ,探讨其小气候的形成机制 ,揭示了人工林生态系统在生态恢复后的小气候变化规律 .多年的小气候观测表明 ,与杉木幼林比较 ,杉木成熟林生态系统可将年平均降低 0 4℃ ,月平均气温最大可降低 2 3℃ ;可降低年平均地表温度1 2℃ ,月地表平均温度最大可降低 2 3℃ ;可增加年蒸发散 10 0mm以上 .人工林生态系统环境能量数据分析表明 ,主要通过林冠层调节环境能量数值和分布来改善系统的小气候条件 ,即通过影响潜热、乱流交换热、位能、动能等能量要素 ,降低系统的温度及其变幅

Microclimate and Its Formation Mechanism in Cunninghamia lanceolata Hook. Plantation Ecosystems in the Subtropical Zone of China

Microclimate characteristics and related environmental energy mechanisms were examined based on the long-term located observations in the mature, thinned and young Cunninghamia lanceolata plantation ecosys tems in western Hunan Province, China. The results show that the mature plantation ecosystem can improve the microclimate significantly by regulating the amount and spatial distribution of environmental energy, which delin eates the pattern of the microclimate in forest ecosystems in the process of ecological restoration. Compared with the young plantation, the mature plantation ecosystem decreased annual mean air temperature by 0.4 °C. The max imum decrease in monthly mean air temperature was 2.3 ~C. The mature plantation ecosystem decreased annual mean ground temperature by 1.2 °C with a maximum decrease in monthly mean ground temperature of 2.3 °C. Ma inly due to the dense canopy, the mature forest ecosystem regulates the distribution of radiation energy, and ex penditure ratios of heat budget and principal energy components to decrease temperature or make it even.