添加气改变了常青大叶森林中占主导地位的树种的树冠生物特征
Nan Liu1, Fangyan Liu2, Zhongyu Sun3
1Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, 510650 Guangzhou, China; College of Life Sciences, Gannan Normal University, 341000 Ganzhou, China.
The Science of the total environment
|July 31, 2023
概括
覆盖层中的添加会影响森林生态系统. 虽然一些物种表现出增强的碳同化和繁殖,但其他物种可能面临功能障碍,影响森林组成和生态作用.
科学领域:
- 森林生态森林生态学
- 植物生理学 植物生理学
- 环境科学环境科学
背景情况:
- 由于技术挑战,对森林树冠对操纵的沉积的反应存在有限的研究.
- 沉积是影响陆地生态系统的重要环境因素.
研究的目的:
- 评估树冠添加 (CN) 对中国常青大叶森林中占主导地位的树种生理和树冠特征的影响.
- 了解增加沉积对森林生态系统功能和物种组成的长期影响.
主要方法:
- 利用一个天花板添加 (CN) 平台进行受控实验.
- 使用实验室分析和无人机 (UAV) 观测来评估树的反应.
- 测量了关键的生理参数,如净光合作用率 (An),酶活性 (SOD,CAT,Rubisco) 和叶子特征.
主要成果:
- 添加 (25 和 50 公斤 N ha-1 yr-1) 显著增加了所有三种物种的净光合作用速率.
- 叶面积增加,而叶子厚度下降在丰富下的一些物种.
- 与碳固定和抗氧化剂防御相关的酶活动发生了变化,物种之间的反应各不相同.
- 在某些物种和方向上,树冠花覆盖面增加,而森林差距动态受到的影响最小.
结论:
- 长期添加可能会破坏Engelhardia roxburghiana中碳固定和抗氧化防御的平衡.
- 在丰富下,Schima superba和Castanea henryi表现出协调的碳同化,抗氧化能力和繁殖潜力.
- 这些发现表明,由于增强的沉积,常青大叶森林中的物种组成和生态功能可能会发生变化.
- 该研究为森林管理策略提供了科学基础,以应对大气中沉积量的增加.
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