在哈萨克斯坦和蒙古的土地覆盖和生态系统功能变化的不成比例贡献
Jing Yuan1,2, Jiquan Chen3,4,5
1Center for Global Change and Earth Observations, Michigan State University, East Lansing, MI, 48823, USA. Jing.Yuan@water.ca.gov.
Scientific reports
|September 19, 2024
概括
土地覆盖面的变化对生态系统功能,如碳和水产产生,产生重大影响. 森林对蒸发转化和总初级生产的贡献过大,而草原和耕地贡献不足,显示土地利用变化的不对称影响.
科学领域:
- 生态生态学 生态生态学
- 遥感 遥感 遥感 遥感
- 环境科学 环境科学
背景情况:
- 土地使用和土地覆盖变化 (LULCC) 显著改变了生态系统功能,包括碳和水循环.
- 绘制地图LULCC正在推进遥感,但将这些变化与区域规模的生态系统功能联系起来仍然是一个挑战.
研究的目的:
- 研究景观构成对区域范围内的生态系统功能 (GPP和ET) 的贡献.
- 测试生态系统功能与土地覆盖组成不成比例的假设,导致LULCC的不对称影响.
主要方法:
- 采用计算效率高的线性缩放方法来整合MODIS (500m) 和Landsat (30m) 数据.
- 在蒙古和哈萨克斯坦的六个宏观景观中量化生态系统功能 (GPP,ET) 和土地覆盖组成.
- 开发的指标:功能对组合比 (F/C) 和功能对组合变化比 (ΔF/ΔC).
主要成果:
- 缩小规模的ET和GPP在土地覆盖类型和国家之间存在差异.
- 森林显示功能与组成的比率> 1 (过度贡献),而草原和耕地是≈ 1 (不足贡献). 巴伦斯的F/C<1但>0.
- 土地覆盖面转换的影响是不对称的:森林转换减少了ET/GPP,而草原/荒地转换增加了它们.
结论:
- 生态系统功能与土地覆盖组成不成比例,这证实了LULCC的不对称影响.
- 线性下调方法为评估LULCC对生态系统功能的影响提供了一种具有成本效益的方法.
- 调查结果强调了森林的关键作用和土地覆盖面转换对区域生态系统服务的差异性影响.
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