全球生态系统的循环在土地利用转换和其逆转之间相互交互
Yves Uwiragiye1,2, Jing Wang3, Yuanyuan Huang4,5
1School of Geography, Nanjing Normal University, Nanjing, China.
Global change biology
|October 19, 2024
概括
土地利用变化对循环产生重大影响,使自然生态系统变成"漏洞"系统,失去重要营养素. 恢复生态系统可以扭转这些损失,改善留.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 生物地质化学生物地质化学
背景情况:
- 人为土地利用变化深深影响生态系统功能和环境健康.
- 生态系统的 (N) 循环对于粮食安全至关重要,但其对土地利用变化的全球反应未得到量化.
- 以前的研究还没有完全阐明全球土地利用转变对N周期动态的定量影响.
研究的目的:
- 量化土地利用变化对生态系统循环的全球影响.
- 确定影响土地利用转换和逆转后留和损失的关键驱动因素.
- 为了精确地确定改变循环的地理热点.
主要方法:
- 分析了2430个配对观测结果,比较了全球自然和管理生态系统.
- 利用结构方程建模来识别生态系统留的预测因素.
- 检查了化,固定和酸盐与的比率,以评估N循环的功能.
主要成果:
- 将自然生态系统转换为管理生态系统会增加通过漏和气体排放 (例如,氧化) 的损失,从而创造一个"漏"的循环.
- 恢复土地使用以类似于自然状态,平均可以扭转N损失108%,从而导致更保守的N循环.
- 土壤有机碳,pH和C:N比率的变化比土壤水分或温度更为关键,用于预测N的保留.
结论:
- 土地利用变化严重破坏了生态系统的循环,增加了营养损失.
- 生态系统的恢复可以有效地恢复留能力,强调土地管理实践的重要性.
- 泄漏循环的热点集中在赤道/热带地区,西欧,美国和中国.
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