Interannual and seasonal variations in energy and carbon exchanges over the larch forests on the permafrost in northeastern Mongolia
Interannual and seasonal variations in energy and carbon exchanges over the larch forests on the permafrost in northeastern Mongolia
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DOI：
10.1016/j.polar.2013.12.004
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发表时间：
2014-06
期刊：
影响因子：
1.8
通讯作者：
S. Miyazaki;M. Ishikawa;N. Baatarbileg;S. Damdinsuren;Nymsambuu Ariuntuya;Yamkhin Jambaljav
中科院分区：
文献类型：
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作者：
S. Miyazaki;M. Ishikawa;N. Baatarbileg;S. Damdinsuren;Nymsambuu Ariuntuya;Yamkhin Jambaljav
蒙古东北部多年冻土区落叶松林位于西伯利亚针叶林的南端，是评价气候变化效应和森林响应的关键区域之一。2010 - 2012年，对蒙古东北部落叶松林（48°15′24′′N，106°51′3′′E，海拔1338 m）水文气象要素、能量和碳交换的季节和年际变化进行了长期监测。年气温和降水量介于−0.13 °C至−1.2 °C之间，230毫米至317毫米。在3米深处发现了永久冻土。10 ~ 5月的能量收支主要为感热通量（H/有效能Ra = 0.46;潜热通量LE/Ra= 0.15），6 ~ 9月的能量收支主要为潜热通量（H/Ra= 0.28，LE/Ra= 0.52）。年净生态系统交换量（NEE）、初级生产总值（GPP）和生态系统呼吸量（RE）分别为−131-−257 gC m− 2 y −1、681-703 gC m− 2 y −1和423-571 gC m− 2 y −1。LE和NEE对水汽压亏缺和表层土壤含水量均有显著的响应。
The larch forests on the permafrost in northeastern Mongolia are located at the southern limit of the Siberian taiga forest, which is one of the key regions for evaluating climate change effects and responses of the forest to climate change. We conducted long-term monitoring of seasonal and interannual variations in hydrometeorological elements, energy, and carbon exchange in a larch forest (48°15′24′′N, 106°51′3′′E, altitude: 1338 m) in northeastern Mongolia from 2010 to 2012. The annual air temperature and precipitation ranged from −0.13 °C to −1.2 °C and from 230 mm to 317 mm. The permafrost was found at a depth of 3 m. The dominant component of the energy budget was the sensible heat flux (H) from October to May (H/available energy [Ra] = 0.46; latent heat flux [LE]/Ra= 0.15), while it was the LE from June to September (H/Ra= 0.28, LE/Ra= 0.52). The annual net ecosystem exchange (NEE), gross primary production (GPP), and ecosystem respiration (RE) were −131 to −257 gC m−2y−1, 681–703 gC m−2y−1, and 423–571 gC m−2y−1, respectively. There was a remarkable response of LE and NEE to both vapor pressure deficit and surface soil water content.