在过去60年森林砍伐期间,亚马逊盆地土壤侵蚀的评估
Nelva B Riquetti1, Samuel Beskow1, Li Guo2
1Water Resources Graduate Program, Federal University of Pelotas, Campus Porto, Rua Gomes Carneiro, 1, 96010-610, Pelotas, RS, Brazil.
Environmental research
|August 8, 2023
概括
自1960年以来,亚马逊地区用于农业和畜牧业的森林砍伐大幅增加了土壤侵蚀的600%以上. 这种环境退化在亚马逊南部和东南部最严重,影响了关键的河流子流域.
科学领域:
- 环境科学 环境科学
- 生态生态学 生态生态学
- 地质科学是地球科学.
背景情况:
- 亚马逊盆地的环境可持续性受到人类活动的威胁.
- 农业和畜牧业的森林砍伐推动了土地利用的变化.
- 土壤侵蚀是亚马逊地区环境退化的一个关键指标.
研究的目的:
- 分析森林砍伐对亚马逊盆地土壤侵蚀率的影响.
- 量化土壤侵蚀的变化与土地利用的变化随着时间的推移.
- 确定受土壤侵蚀增加影响最严重的地区和子盆地.
主要方法:
- 使用了三个土地使用时间地图 (1960,1990,2019).
- 在土壤侵蚀分析中应用了修订后的普遍土壤损失方程 (RUSLE).
- 对于关键子盆地的沉积物输送率 (SDR) 的计算.
主要成果:
- 1960年至2019年间,平均土壤侵蚀率增加了600%以上.
- 森林的砍伐 (大约. 7%或411,857公里2) 是增加土壤侵蚀的主要驱动因素.
- 南部和东南部地区,特别是马德拉,索利蒙斯,辛古和塔帕戈斯分盆地,呈现出最显著的侵蚀增长.
结论:
- 农业和畜牧业活动的森林砍伐显著加剧了亚马逊地区的土壤侵蚀.
- 增加的土壤侵蚀率对亚马逊盆地的环境可持续性构成重大威胁.
- 受安第斯山脉影响的子盆地表现出较高的沉积物输送率,加上侵蚀的增加.
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