Thermal Impacts of Boreal Forest Vegetation on Active Layer and Permafrost Soils in Northern da Xing'Anling (Hinggan) Mountains, Northeast China
Thermal Impacts of Boreal Forest Vegetation on Active Layer and Permafrost Soils in Northern da Xing'Anling (Hinggan) Mountains, Northeast China
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DOI：
10.1657/aaar00c-14-016
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发表时间：
2015-05
期刊：
影响因子：
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通讯作者：
X. Chang;H. Jin;Yanlin Zhang;R. He;D. Luo;Yong-ping Wang;L. Lü;Qiuliang Zhang
中科院分区：
文献类型：
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作者：
X. Chang;H. Jin;Yanlin Zhang;R. He;D. Luo;Yong-ping Wang;L. Lü;Qiuliang Zhang
摘要 2009年，中国森林生态研究网络（CFERN）东北地区大兴安岭站（根河）建立了综合观测系统，并逐步完善，以评价结构复杂、成分多样的北方森林植被对活动层和浅层多年冻土热状况的影响。在三个选定的具有相似微地形、土壤和排水条件的典型森林地点，利用永久安装在钻孔中的热敏电阻电缆测量了地表和0.05至5.0 m不同深度的土壤温度。对各种植物特征的温度数据进行了比较和对比。在对照实验中，树木和灌木被移除，以更好地了解植被移除的热液效应。结果表明：（1）植被层对地面保温效果明显。在其他条件相同的情况下，植被较密的林分相同深度的地温较低。 (2)植被退化时地面升温，植被退化引起的地温升高在冬季比夏季更深。 （3）在植被大面积退化的情况下，由此引起的地面变暖会长期持续，导致活动层加深。
Abstract A comprehensive observing system was established at the Da Xing'anling (Hinggan) Mountains Station (Gen'he) of China Forest Ecological Research Network (CFERN) in Northeast China in 2009 and gradually improved since in order to evaluate the influences of boreal forest vegetation with complex structures and various components on the thermal regimes of active layer and shallow permafrost soils. At three selected typical forest sites with similar micro-reliefs, soils, and drainage conditions, the soil temperatures on the ground surface and at various depths ranging from 0.05 to 5.0 m were measured with thermistor cables permanently installed in boreholes. The temperature data were compared and contrasted for various vegetative features. In a control experiment, trees and shrubs were removed to better understand the hydrothermal effects of vegetation removal. Results show that: (1) The vegetative layer provides an evident effect of thermal insulation on the ground. The ground temperature at the same depth was lower at a stand with denser vegetation when other conditions are held the same. (2) The ground warms up when the vegetation degrades, and the ground temperature rises from the vegetation degradation could reach much deeper in winter than in summer. (3) In cases of extensive vegetation degradation, the resultant ground warming persists for a long time, resulting in a deepening active layer.