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以小兴安岭原始红松阔叶混交林林隙为对象,采用网格法布点,对生长季林隙内各样点光量子通量密度(photosynthetic photon flux density,PPFD)进行连续观测,利用基本统计学和地统计学方法分析其时空分布格局.结果表明:红松阔叶混交林林隙的PPFD高值区日变化明显,最大值出现在12:00,位于林隙北侧.林隙的PPFD 6月最高,7、8、9月依次递减,其中7月PPFD不同位置间的变异系数最大;各月均为中等变异.不同月份林隙PPFD空间异质性的强度和尺度不同,6月变程最大,7月基台值和结构比最大;各月林隙PPFD斑块复杂程度不同,最大值均位于林隙东北侧.郁闭林分和空旷地的月平均PPFD变化次序与林隙一致.各样点月平均PPFD为空旷地最高,林隙次之,郁闭林分最低.
Taking the gap of the original Korean pine and broad-leaved mixed forest in Xiaoxing’anling as an example, the photosynthetic photon flux density (PPFD) in the gap were measured continuously by using grid points. The basic statistics and Geostatistics method was used to analyze the spatial and temporal distribution of PPFD.The results showed that the diurnal variation of PPFD in the gaps of Pinus koraiensis and broad-leaved mixed forests was significant, with the maximum occurring at 12:00 and located on the north side of the gaps. The highest in July, the lowest in July, the lowest in July, the lowest in July, and the highest in July, the lowest in July, the lowest in July, the second was in July.The variation coefficient of PPFD in different locations was the highest in July, and each month was the middle variation.The PPFD spatial heterogeneity in different months had different intensity and scale, , And the maximum value of pedestal value and structure ratio in July was the largest. The PPFD patches in each month had different degrees of complexity, and the maximum values were located on the northeast side of the gap. The average monthly PPFD of samples was the highest in the open area, followed by the gap, and lowest in the closed canopy.