对畜牧放牧和气候变化的特定地带生物地化学反应
Uthara Vengrai1, Robin H Kelly2, Sarah E Evans3
1School of the Environment, Yale University, New Haven, Connecticut, USA.
概括
畜牧放牧对干旱地区的碳循环产生不同影响,取决于地点. 气候变化的影响可能会压倒放牧管理,特别是在热带地区,导致土壤碳的大量损失.
科学领域:
- 生态生态学 生态生态学
- 生物地质化学生物地质化学
- 气候科学 气候科学
背景情况:
- 干旱地覆盖了地球40%的土地,并储存了20%的土壤有机碳.
- 牲畜放牧在干旱地区很常见,但其对碳循环的影响尚不清楚.
- 干旱地区气候变化与土地管理之间的相互作用尚不清楚,尤其是在热带地区.
研究的目的:
- 调查放牧强度和气候变化对干旱地区生物地质化学动态的影响.
- 探索北美,南美,亚洲和非洲的特定地点的反应.
- 了解土地管理和气候变化如何相互作用影响干旱地区的碳循环.
主要方法:
- 使用了DAYCENT生态系统模拟模型.
- 模拟的牧场强度和预测的气候变化场景.
- 分析了全球干旱地区对土壤碳输入,输出和储存的影响.
主要成果:
- 对牧场和气候变化的生物地质化学反应是特定于地点的.
- 在气候变化较小的地区 (美洲),繁茂的牧场减少了土壤碳.
- 气候变化对非洲的影响最大,预计到2100年土壤碳减少20%.
结论:
- 局部气候变化影响可能会随着时间的推移主导土地管理对干旱地区生态系统的影响.
- 特定地点的气候敏感性和土地利用对于了解全球干旱地区碳动态至关重要.
- 需要进一步的研究,特别是在热带地区,以澄清这些复杂的相互作用.
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