季节性雪被对川西亚高山针叶林土壤温度的影响
发布时间:2018-04-13 07:38
本文选题:土壤温度 + 冻融循环 ; 参考:《应用与环境生物学报》2017年04期
【摘要】:季节性雪被对冬季寒冷区域土壤有潜在保温作用.采用人工遮雪法研究季节性雪被对川西亚高山针叶林土壤温度的影响.结果表明:川西亚高山冬季雪被具有明显的动态变化特征;雪被能有效减少土壤与空气之间的热量交换,使冬季土壤温度保持稳定.雪被去除使得0、5、10和20 cm土壤日均温度分别降低1.12、0.83、0.33和0.16℃,最低温度分别降低7.33、2.10、1.17和0.75℃.冬季土壤冻结状况与雪被条件密切相关,雪被去除使得0、5、10和20 cm土壤冻结时间分别缩短19、16、11和2 d,而冻融循环则分别增加39、12、6和1次.综上所述,川西亚高山季节性雪被对冬季土壤具有一定的保温作用,雪被效应随土壤深度增加而降低;因此未来气候变化引发的川西地区季节性雪被时空格局变化,可能对区域冬季和生长季土壤水热动态产生深刻影响.
[Abstract]:Seasonal snow cover has potential thermal insulation effect on soil in cold winter regions.The effect of seasonal snow cover on soil temperature of subalpine coniferous forest in western Sichuan was studied by artificial snow cover method.The results show that the winter snow cover in western Sichuan has obvious dynamic characteristics, and the snow cover can effectively reduce the heat exchange between soil and air and keep the soil temperature stable in winter.The removal of snow reduced the daily average temperature of 0 ~ 5 ~ 5 ~ (10) and 20 cm soil by 1.12 ~ 0.83 ~ 0.33 鈩,
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