南瓮河自然保护区杜鹃落叶松林土壤温度变化分析

Variation of Soil Temperature of mixed forest of Rhododendron dauricum and Larix gmelinii in Nanwenghe Nature Reserve

通过对南瓮河自然保护区内杜鹃落叶松林不同层次土壤温度的对比分析,研究了各层土壤温度随时间变化规律及其垂直梯度变化特征。结果表明：杜鹃落叶松林5-10cm、30-40cm之间的土壤温差变化较小,10-20cm、20-30cm之间的土壤温差变化较大;夏季时土壤最高温度出现在5cm层,冬季时最高温度出现在40cm层;土壤各层的年温差随深度的加深而逐渐减小,最高温度出现在7月,最低温度出现在2月。

Soil temperature of Rhododendron dauricumand Larix gmelinii plantation in Nanwenghe Nature Reserve were analyzed.Variation rules and variation characteristics of its vertical gradient in each layer were studied through analyzing data in soil layer.Result shows that the variation of soil temperature is little in the soil layer（5-10 cm 30-40cm）and that is large in the soil layer（10-20 cm 20-30cm）;the highest temperature appeared in 5cm layer in summer and that appear in 40 cm layer in winter;the annual temperature difference of the soil layers decrease with the increase of the depth;the maximum temperature appear in July and the lowest temperature appear in February.