Risks to carbon storage from land-use change revealed by peat thickness maps of Peru

Risks to carbon storage from land-use change revealed by peat thickness maps of Peru
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秘鲁泥炭厚度图揭示土地利用变化对碳储存的风险

DOI:
10.1038/s41561-022-00923-4
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发表时间:
2022
期刊:
影响因子:
18.3
通讯作者:
Hastie A
Hastie A
中科院分区:
地球科学1区
文献类型:
--
作者:
Hastie A

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热带泥炭地是碳密度最高的生态系统之一,但土地使用的变化导致大片泥炭地面积的丧失,并伴随着大量温室气体的排放。为了设计有效的保护和恢复政策,热带泥炭地的位置和碳储存地图至关重要。在秘鲁等国家尤其如此,因为这些国家对大面积、水文上完整的泥炭地的分布知之甚少。在这里,现场和遥感数据支持泥炭地的范围和厚度为低地秘鲁亚马逊模型的发展。我们估计泥炭地面积为62,714平方公里(第5和第95置信区间分别为58,325和67,102平方公里),碳储量为5.4(2.6-10.6)PgC,接近秘鲁的整个地上碳储量,但仅占其陆地面积的5%。结合泥炭地范围的地图与国家土地覆盖数据,我们揭示了小,但不断增长的森林砍伐面积和相关的二氧化碳排放量从泥炭分解,由于转换为采矿,城市地区和农业。2000年被列为森林的泥炭地的排放量占秘鲁2000年至2016年森林二氧化碳排放量的1-4%。我们建议,定制的监测,保护和可持续管理的热带泥炭地,以避免进一步退化和CO2排放。
Tropical peatlands are among the most carbon-dense ecosystems but land-use change has led to the loss of large peatland areas, associated with substantial greenhouse gas emissions. To design effective conservation and restoration policies, maps of the location and carbon storage of tropical peatlands are vital. This is especially so in countries such as Peru where the distribution of its large, hydrologically intact peatlands is poorly known. Here field and remote sensing data support the model development of peatland extent and thickness for lowland Peruvian Amazonia. We estimate a peatland area of 62,714 km2(5th and 95th confidence interval percentiles of 58,325 and 67,102 km2, respectively) and carbon stock of 5.4 (2.6–10.6) PgC, a value approaching the entire above-ground carbon stock of Peru but contained within just 5% of its land area. Combining the map of peatland extent with national land-cover data we reveal small but growing areas of deforestation and associated CO2emissions from peat decomposition due to conversion to mining, urban areas and agriculture. The emissions from peatland areas classified as forest in 2000 represent 1–4% of Peruvian CO2forest emissions between 2000 and 2016. We suggest that bespoke monitoring, protection and sustainable management of tropical peatlands are required to avoid further degradation and CO2emissions.
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