Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions, Henan University, Kaifeng 475001, China.
Department of Environmental and Geographical Science, University of Cape Town, Rondebosch 7701, South Africa.
Int J Environ Res Public Health. 2019 Jul 11;16(14):2460. doi: 10.3390/ijerph16142460.
Land cover change (LCC) and its impact on CO sequestration and radiative forcing (RF) could dramatically affect climate change, but there has been little effort to address this issue in South and Southeast Asia over a long period of time using actual land cover information. In this study, annual land cover data from 1992 to 2015 were used to assess the CO flux and corresponding RF due to LCC in South and Southeast Asia. The results showed that 553.2 × 10 km of the region experienced LCC during this period, mostly due to land reclamation, urban expansion, and deforestation. These LCC caused a marked net decrease in net ecosystem productivity (NEP) as a composite of the various land cover categories during the whole study period, especially since 2001. The CO sequestration was 2160 TgCO during the early 1990s however cumulative sequestration decreased by 414.95 TgCO by 2015. Correspondingly, the cooling effect of NEP, i.e. the total actual RF, was -0.366 W m in South and Southeast Asia between 1992 and 2015. However, the potential RF of the cumulatively reduced NEP due to LCC relative to the 1990s resulted in a warming effect of 2.33 × 10 W m in 2015. Our study provides an applicable framework to accurately assess the potential effect of large-scale LCC on climate.
土地覆被变化（LCC）及其对 CO 固存和辐射强迫（RF）的影响可能会显著影响气候变化，但在很长一段时间内，南亚和东南亚几乎没有利用实际土地覆被信息来解决这一问题。在这项研究中，使用了 1992 年至 2015 年的年度土地覆被数据，评估了南亚和东南亚因 LCC 而导致的 CO 通量和相应的 RF。结果表明，在这段时间内，该地区有 553.2×10 km 的土地发生了 LCC，主要是由于土地开垦、城市扩张和森林砍伐。这些 LCC 导致整个研究期间（尤其是 2001 年以来）各种土地覆被类型的净生态系统生产力（NEP）综合表现出明显的净减少。在 1990 年代初期，CO 的固存量为 2160 TgCO，但到 2015 年，累计固存量减少了 414.95 TgCO。相应地，NEP 的冷却效应，即总实际 RF，在 1992 年至 2015 年期间为南亚和东南亚的-0.366 W m。然而，由于 LCC 而导致的累计减少的 NEP 的潜在 RF 导致 2015 年的变暖效应为 2.33×10 W m。本研究提供了一个适用的框架，可以准确评估大规模 LCC 对气候的潜在影响。
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