Land use and cover change in Northeast China and its impacts on the Xing'an permafrost in 1980s–2010s
Land use and cover change in Northeast China and its impacts on the Xing'an permafrost in 1980s–2010s
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DOI：
10.1002/ldr.4377
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发表时间：
2022-06
影响因子：
4.7
通讯作者：
Hongwei Wang;Huijin Jin;Xiaoying Li;R. He;R. Serban;Xiaoying Jin;Xue Yang;M. Șerban;
中科院分区：
文献类型：
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作者：
Hongwei Wang;Huijin Jin;Xiaoying Li;R. He;R. Serban;Xiaoying Jin;Xue Yang;M. Șerban;
北方森林和湿地对以生态系统为主的兴安多年冻土的开发和保护具有重要影响。然而，不同生态系统对气候变化的反应以及对下面的永久冻土的影响仍然不清楚。基于多时段土地利用/土地覆盖数据和气温长时间序列，结合普通最小二乘(OLS)和普通克立格(OK)方法，分析了土地利用/覆被变化(LUCC)对中国东北地区年平均气温和冻土分布的影响。从20世纪80年代到2010年代，中国东北地区的MAAT呈上升趋势(0.025℃/年)，多年冻土范围呈下降趋势(−3668km2/年−1)。多年冻土退化主要发生在林地和草地，面积分别减少4.0106×104km2和3.8754×104km2。LULC的转化加剧了多年冻土的退化。从20世纪80年代到2010年代，随着林地和草地的退耕还林还草，多年冻土面积缩小了6233 km2。我们的结果证实了LUCC对兴安多年冻土的重大影响，导致了其退化。为东北中国多年冻土区北方森林湿地生态系统的生态环境保护与恢复与可持续发展提供科学依据。
Boreal forest and wetland have important influences on the development and protection of the ecosystem‐dominated Xing'an permafrost. However, the responses of different ecosystems to climate change and the impacts on the underlying permafrost are still unclear. Here, based on the multi‐period land use/land cover (LULC) data and long‐time series of air temperature, combined with the ordinary least squares (OLS) and ordinary kriging (OK) methods, the effects of land use and cover change (LUCC) on the distribution of mean annual air temperature (MAAT) and permafrost in Northeast China were analyzed. From 1980s to 2010s, MAAT showed an upward trend (0.025°C per yr) and extents of permafrost showed a decreasing trend (−3668 km2yr−1) in Northeast China. Permafrost degradation mainly occurred in forested land and grassland, with areal reductions of 4.0106 × 104 and 3.8754 × 104 km2, respectively. The transformation of LULC aggravates the degradation of permafrost. The conversions of forested land and grassland to cultivated land and forested land to grassland resulted in the shrinkage of permafrost extent by 6233 km2 from 1980s to 2010s . Our results confirm the significant impacts of LUCC on the Xing'an permafrost resulting in its degradation. Additionally, they can provide a scientific basis for ecological environment protection and restoration and sustainable development of boreal forest and wetland ecosystems in permafrost regions of Northeast China.