可用土壤的全球模式 热带森林生态系统中矿化-固定化周转率的N生产
Yi Zhang1, Hong Gao2, Zucong Cai3
1School of Geography, Nanjing Normal University, Nanjing 210023, China.
The Science of the total environment
|November 2, 2023
概括
这项研究估计了全球热带森林中的土壤可用 (Navail-soil),这对植物营养和碳捕获至关重要. 这些发现为评估这些重要生态系统中碳捕集潜力的基础.
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
- 土壤科学 土壤科学
背景情况:
- 可用 (Navail) 对植物微生物系统和陆地生态系统中的碳捕获至关重要.
- 土壤可用的生产 (Navail-soil) 是森林总Navail的关键组成部分,但由于变化,缺乏全球估计.
- 影响因素包括气候和土壤的物理化学特性,需要先进的建模方法.
研究的目的:
- 在全球范围内估计热带森林生态系统中的Navail-soil.
- 量化矿化和固定化周转 (MIT) 对Navail-soil的贡献.
- 为评估热带森林的碳捕获潜力提供理论基础.
主要方法:
- 汇集了总土壤矿化率 (GRmin),固定化率 (GRac) 和固定化率 (GRnc) 的数据集.
- 集成的地理,气候和土壤物理化学数据.
- 开发了一种随机森林 (RF) 模型,以从有机N矿化和无机N固定化周转中预测Navail-soil.
主要成果:
- 射频模型对GRmin (R2 = 0.76),GRac (R2 = 0.77),和GRnc (R2 = 0.67) 的预测准确度很好.
- 估计总N土为1.13 Pg N年-1,总NN2-固定和N沉积贡献额外的0.040.06 Pg N年-1.
- 总初级生产率和土壤呼吸量的计算C:N比率与热带森林植物和垃圾中观察到的比率一致.
结论:
- 本研究提供了使用RF模型在热带森林中Navail-soil的第一个全球估计.
- 这些发现证实了该模型的预测与麻省理工学院Navail-soil生产的理论估计一致.
- 这些结果为南美,东南亚和非洲的热带森林生态系统的碳封存潜力提供了关键的见解.
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