Forest expansion dominates China's land carbon sink since 1980.

Forest expansion dominates China's land carbon sink since 1980.
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DOI:
10.1038/s41467-022-32961-2
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发表时间:
2022-09-13
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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碳预算核算在很大程度上依赖于各国政府报告的粮农组织土地使用数据。在这里,我们开发了一个新的中国土地利用和覆盖变化数据库,发现不同的历史调查方法有偏见的中国报告的数据造成很大的错误,在联合国粮食和农业组织的数据库。新数据驱动的土地生态系统模型模拟显示,从1980年到2019年,中国有8.9 ± 0.8 Pg碳的强大碳汇,由于土地利用和覆盖变化信号的偏差,这在联合国粮食及农业组织基于数据的估计中没有得到。1980年至2019年,中国的土地利用和覆盖变化以森林快速扩张为特征,贡献了全国近44%的陆地碳汇。相比之下,气候变化(22.3%),氮沉降增加(12.9%)和二氧化碳增加(8.1%)是不太重要的贡献者。这表明以往的研究严重低估了土地利用/覆盖变化对中国陆地碳平衡的影响。这项研究强调了可靠的土地利用和覆盖变化数据库在全球碳预算核算中的重要性。由于现有数据库存在较大偏差,中国土地利用/覆盖变化(LUCC)对生态系统碳储量的影响尚不清楚。在这里,作者开发了一个新的LUCC数据库,纠正了错误的信号,并揭示了森林扩张是中国近年来碳汇的主要驱动力。
Carbon budget accounting relies heavily on Food and Agriculture Organization land-use data reported by governments. Here we develop a new land-use and cover-change database for China, finding that differing historical survey methods biased China’s reported data causing large errors in Food and Agriculture Organization databases. Land ecosystem model simulations driven with the new data reveal a strong carbon sink of 8.9 ± 0.8 Pg carbon from 1980 to 2019 in China, which was not captured in Food and Agriculture Organization data-based estimations due to biased land-use and cover-change signals. The land-use and cover-change in China, characterized by a rapid forest expansion from 1980 to 2019, contributed to nearly 44% of the national terrestrial carbon sink. In contrast, climate changes (22.3%), increasing nitrogen deposition (12.9%), and rising carbon dioxide (8.1%) are less important contributors. This indicates that previous studies have greatly underestimated the impact of land-use and cover-change on the terrestrial carbon balance of China. This study underlines the importance of reliable land-use and cover-change databases in global carbon budget accounting. The impact of land-use and cover-change (LUCC) on ecosystem carbon stock in China is poorly known due to large biases in existing databases. Here the authors develop a new LUCC database with corrected false signals and reveal that forest expansion is the dominant driver of China’s recent carbon sink.
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