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以小兴安岭原始红松阔叶混交林林隙为研究对象,通过对林隙内光量子通量密度(PPFD)、气温和空气相对湿度进行连续观测,比较其间的时空分布格局.结果表明:晴天和阴天阔叶红松林林隙的PPFD日最大值均出现在11:00—13:00,晴天林隙内各个时段最大值出现位置不同,日最大值出现在林隙北侧林冠边缘处;而阴天各个时段最大值均处于林隙的中心.林隙内月平均PPFD为6月最高、9月最低,极差7月最大.林隙内晴天气温的峰值出现在9:00—15:00,而阴天气温峰值在15:00—19:00,均位于林隙中心南8m.5:00—9:00林隙各点阴天的气温都高于晴天,9:00—19:00则相反.月平均气温为6月最高、9月最低.晴天和阴天空气相对湿度的峰值均出现在5:00—9:00,日最大值在林隙西侧林冠边缘处,且阴天的相对湿度始终大于晴天.月平均相对湿度为7月最高、6月最低.晴天PPFD的异质性大于阴天,而气温和相对湿度的异质性则不明显.生长季内不同月份PPFD、气温和空气相对湿度的最大值所处位置不同.PPFD和气温的月均值在林隙中心及附近变化梯度较大,而相对湿度的月均值则在林隙边缘变化梯度较大.
Taking the gaps of original Korean pine and broad-leaved mixed forest in Xiaoxing’anling as the research object, the spatial and temporal distribution patterns of light quantum flux density (PPFD), air temperature and air relative humidity in the gap were observed continuously, and the temporal and spatial distribution patterns were compared. The results showed that: The daily maximum of PPFD in the gaps of broad-leaved Korean pine forests occurred at 11: 00-13: 00. The maximum values appeared in the gaps of clear-day gaps at different time intervals, and the daily maximum appeared at the edge of the canopy in the north of the gap. The maximum of each period was in the center of the gap.The monthly average PPFD in the gap was the highest in June and the lowest in September and the maximum was in July.The peak of sunny temperature in the gap appeared at 9:00 to 15:00, The cloudy peak temperature in the 15: 00-19: 00, are located in the center of the gap 8m.5: 00-9: 00 gap between the cloudy sky temperatures are higher than sunny, 9: 00-19: 00 On the contrary, the monthly average temperature was the highest in June and the lowest in September, and the peak values of sunny and cloudy relative humidity occurred in 5: 00-9: 00, with the daily maximum at the edge of the canopy on the west side of the gap and cloudy The relative humidity is always greater than the sunny day.The monthly average relative humidity is the highest in July and the lowest in June.The sunny day PPFD heterogeneity is greater than the cloudy day and the temperature and the relative Degree of heterogeneity is not obvious.During the growing season PPFD, the maximum temperature and air relative humidity in different positions are located at different positions.The monthly mean of PPFD and temperature has a greater gradient in the center of the gap and the neighborhood, while the relative humidity The monthly mean value of the gradient in the edge of the gap gradient.