重复的化肥增强了苏格兰松的生长和碳吸收,但在北极森林中没有持续的长期影响
Anni Palvi1, Eduardo Martínez-García1, Paul Szejner1
1Natural Resources Institute Finland (Luke), Latokartanonkaari 9, FI-00790 Helsinki, Finland.
Tree physiology
|May 6, 2025
概括
重复的化肥促进了苏格兰松在芬兰长达六十年的生长. 虽然短期收益逐渐消失,但累积效应显著增加了树木生物质,有助于森林管理和减缓气候变化.
科学领域:
- 林业科学 林业科学
- 生态生态学 生态生态学
- 生物地质化学生物地质化学
背景情况:
- (N) 施肥是一种常见的做法,用于提高营养有限的生态系统中的森林生产力.
- 对北极森林,特别是苏格兰松树的重复应用的长期影响尚不清楚.
- 了解这些影响对于可持续森林管理和气候变化减缓战略至关重要.
研究的目的:
- 为了评估重复化对苏格兰松树生长和碳同化六十年的长期影响.
- 评估基底面积增加 (BAI) 和树环碳同位素组成 (δ13C) 的短期和累积反应.
- 估计利用效率 (NUE) 并了解营养贫乏的北极森林生态系统中的保留.
主要方法:
- 在芬兰中部 (1960-2022) 的苏格兰松树上进行了10年间隔重复N受精的实地实验.
- 在树环中测量基底面积增量 (BAI) 和碳同位素组成 (δ13C).
- 分析针的质量,化学和估计标准水平使用效率 (NUE).
主要成果:
- 单个N加值暂时增加树环 δ13C和基底面积增量 (BAI) 2-7年.
- 每个十年受精周期结束时,BAI和δ13C都恢复到了控制水平,这表明没有持久的转移效应.
- 经过60年,累积的N受精导致BAI比对照地块增加47%,平均十年NUE为0.16 m3每公斤N.
结论:
- 重复的N化肥可以显著提高营养贫乏的北极森林的长期树木生物质生产.
- 虽然短期的N受精效应是短暂的,但它们在几十年内积累导致了大幅增长.
- 这种做法显示出在北极森林管理中支持生物经济和气候变化减缓的潜力.
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