Global non-uniformity in biophysical surface temperature responses to cropland expansion over non-forest vegetation
文献类型: 外文期刊
作者: Menglin Si;Zhao-Liang Li;Xiangyang Liu;Yitao Li;Pei Leng;Bo Hui Tang;Ronglin Tang;Si-Bo Duan;Meng Liu;Chenghu Zhou
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关键词: 无
期刊名称: Communications Earth and Environment
ISSN: 2662-4435
年卷期: 2025 年 6 卷 1 期
页码:
收录情况: SCIE(2025版)
摘要: Cropland changes modulate local temperature by altering terrestrial biophysical properties, yet the global sign and magnitude of this impact remain uncertain due to fragmented distributions and complex natural land-cover conversions. Using satellite remote sensing (2000–2020), we quantify sub-pixel-level biophysical effects on land surface temperature from global cropland expansion into both forest and non-forest vegetation. Our results show that cropland expansion into non-forest vegetation (87% of global conversions) induces spatially heterogeneous temperature responses. Summer cropland conversions caused net global cooling (−0.002 ± 0.000 °C per five years), with 50% attributable to non-forest vegetation replacement. Boreal regions (40°N–50°N) exhibited pronounced cooling (−0.02 ± 0.001 °C per five years), while tropical zones (0°S–10°S) experienced localized warming (+0.07 ± 0.001 °C per five years). Winter cropland conversions contributed minimally to boreal temperature changes but amplified tropical warming (+0.07 ± 0.002 °C per five years; 10°S–20°S). Temperature sensitivity to cropland fraction varied asymmetrically with background land cover: Complete non-forest vegetation replacement in the Northern Hemisphere yielded stronger summer cooling (−0.06 °C) than warming from reversed conversions (+0.02 °C), whereas maximum forest replacement warming (+0.78 °C) exceeded its cooling benefits (−0.55 °C). These findings highlight the summer cooling capacity in boreal non-forest vegetation replacement and reveal the risk of tropical cropland expansion to climate mitigation.
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