Biophysical Effects of Afforestation on Land Surface Temperature in Guangdong Province, Southern China
Biophysical Effects of Afforestation on Land Surface Temperature in Guangdong Province, Southern China
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DOI：
10.1029/2022jg006913
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发表时间：
2022-08
期刊：
影响因子：
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通讯作者：
Wenjuan Shen;Jiaying He;Tao He;Xiangping Hu;X. Tao;Chengquan Huang
中科院分区：
文献类型：
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作者：
Wenjuan Shen;Jiaying He;Tao He;Xiangping Hu;X. Tao;Chengquan Huang
在全球变暖的情况下制定有效的气候缓解战略需要全面了解造林如何影响气候和环境的生物物理机制。中国南方的人工林是一个重要的碳汇。然而，辐射和非辐射过程对陆地表面温度的影响是由转换开放土地（即，草地和农田）和天然林到人工林的转变仍不清楚。利用卫星观测数据和基于内在生物物理机制理论的能量平衡模型，估算了2000 - 2010年广东省疏林地和天然林造林对地表温度的生物物理影响。结果表明，疏林地造林具有一致的净降温效应。模拟结果表明，由于天然林的造林，各转换类型中造林的净增温效应为0.15 ± 0.5K，这是由能量再分配因子的变化引起的，但仍存在不确定性。而将天然林转变为人工林所造成的最显著的变暖也受到了干旱的轻微影响。造林的非辐射和辐射过程分别导致0.143 ± 0.43 K和-0.096 ± 0.19 K的轻微变暖和冷却。造林对地表温度的影响以非辐射过程为主，总体非辐射强迫指数大于73% ± 0.59%。我们的研究强调了保护天然林的必要性，并为评估造林对当地气候的影响和减缓气候变化努力的有效性提供了一种实用的方法。
Developing effective climate mitigation strategies under global warming requires a comprehensive understanding of the biophysical mechanism of how afforestation affects the climate and environment. The planted forests in southern China are an essential carbon sink. However, the impacts of radiative and non‐radiative processes on land surface temperature caused by converting open land (i.e., grassland and cropland) and natural forests to planted forests remain unclear. We used satellite observations and intrinsic biophysical mechanism theory‐based energy balance models to estimate the biophysical impacts of potential afforestation of open land and natural forests on surface temperature from 2000 to 2010 in Guangdong Province, southern China. Results showed that afforestation of open land had a consistent net cooling effect. Due to the afforestation of natural forests, the modeled results revealed that afforestation among all conversion types had a net warming effect of 0.15 ± 0.5 K, which caused by the change in energy redistribution factor although uncertainty remains. While the most significant warming caused by converting natural forest to planted forests was also slightly affected by albedo. The afforestation's non‐radiative and radiative processes led to a slight warming of 0.143 ± 0.43 K and a cooling of −0.096 ± 0.19 K, respectively. The non‐radiative process dominates the effect of afforestation on the surface temperature, with the overall non‐radiative forcing index greater than 73% ± 0.59%. Our study highlights the need of protecting natural forests and provides a practical method for assessing the impacts of afforestation on the local climate and the effectiveness of climate mitigation efforts.