长白山云冷杉林不同大小林隙8月昼间气温和土壤温度比较

以长白山区云冷杉针阔混交林3个不同大小的林隙(456.2、290.2、83.9 m2)为研究对象,在林隙内按照不等距分布设置气温和土壤温度观测点,对8月份林隙内不同观测点气温和土壤温度的连续观测数据进行了分析,探讨了3个林隙内温度的时空变化特征.结果表明:林隙中央位置的气温和土壤温度的日变化均呈单峰型,温度在S－N方向...

Difference in Air and Soil Temperatures in Gaps of Different Sizes in Spruce-fir Forests in the Daytime

Observation points for air and soil temperatures were set in three gaps of different sizes(456.2,290.2,83.9m2,denoted by gap 1,gap 2 and gap 3) in spruce-fir mixed forests in Changbai Mountains in unequal distance.Temporal and spatial variations of temperature in different gaps were analyzed by means of the continuous observation data of air and soil temperatures from different observation points.Results indicated that the daily change in both air and soil temperatures in the center of the gaps could be described by a unimodal curve.The change in temperature in S-N direction was larger than that in E-W Direction.The maximum temperatures occurred at different time in the gaps.The highest air and soil temperatures were at northeast sites near the center in gap 1 and the center in gap 2,and their appearance time was 13:00-15:00.However,the highest air and soil temperatures were at the center and northeast sites near the center for gap 3,and they occurred at 11:00-13:00 and 7:00-11:00 respectively.There was a significant difference in temperature between gaps and non-gaps(p<0.05).