森林气动态应对不断增加的气沉积:在成熟的树林中比较天花板和土壤肥料
Alessandra Teglia1, Cristiana Sbrana2, Stefania Mattana3,4
1Department of Agricultural and Food Science, University of Bologna, Bologna, Italy.
Global change biology
|October 8, 2025
概括
化肥对森林循环产生影响. 将 (N) 应用到土壤或树冠上会改变N的保留和损失,影响生态系统动态和微生物活动.
科学领域:
- 森林生态 森林生态
- 生物地质化学生物地质化学
- 环境科学 环境科学
背景情况:
- (N) 施肥研究对于了解森林生态系统对增加N沉积的反应至关重要.
- 大多数研究集中在土壤N应用上,忽视了树冠-大气相互作用,导致对N命运的不完全理解.
- 森林生态系统由于N沉积的增加而面临改变的N保留和和.
研究的目的:
- 在建立操纵实验4年后,在一片树林中调查生态系统N动态.
- 为了比较土壤应用的N (N30,N60) 与树冠应用的N (N30A) 对N循环的影响.
- 为了评估N度,δ15N特征和森林区间的微生物基因丰度.
主要方法:
- 建立了一个为期四年的操纵实验,使用控制 (N0),土壤N (N30,N60) 和天花板N (N30A) 处理.
- 在叶子,细根,生菌根尖端 (ERT),土壤和垃圾中测量了N度和δ15N.
- 量化了参与土壤N过程的微生物功能基因.
主要成果:
- 度受到最小的影响,但δ15N显著增加,特别是在N60处理中,表明增加了N损失.
- 土壤和ERT显示N度增加,N30和N60下 δ15N增加,这表明真菌不移动,但植物吸收有限.
- 覆盖N应用 (N30A) 导致15N在细根和垃圾中减少,这意味着对菌菌的依赖性增加,并改变了分解.
结论:
- 模拟现实的N沉积需要包括树冠相互作用,以全面了解森林N动态.
- 不同的N应用方法 (土壤与树冠) 对N循环,真菌活动和分解有不同的影响.
- 未来的研究应该纳入树冠N沉积,以准确预测森林对全球变化的反应.
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