来自Ferralsol的氧化和甲排放受到巴西亚热带地区松种植时间的影响
Mariana Alves Ibarr1, Josiléia Acordi Zanatta2, Jeferson Dieckow1
1Departamento de Solos e Engenharia Agrícola/Programa de Pós-Graduação em Ciência do Solo, Universidade Federal do Paraná, Rua dos Funcionários 1540, Bairro Cabral, 80035-050, Curitiba, PR, Brazil.
The Science of the total environment
|August 25, 2023
概括
巴西的Loblolly松种植园显示,随着年龄的增长,土壤的氧化 (N2O) 排放量减少. 旧的松树林中的碳积累大大抵消了温室气体排放,作为碳汇.
科学领域:
- 林业林业 林业 林业 林业
- 土壤科学 土壤科学
- 气候变化研究 气候变化研究
背景情况:
- 松 (Pinus taeda L.) 种植园正在巴西亚热带地区扩大.
- 了解森林年龄对土壤温室气体排放的影响,对于减缓气候变化战略至关重要.
研究的目的:
- 为了调查松树的年龄如何影响土壤的甲 (CH4) 和氧化 (N2O) 排放.
- 将这些排放量与原生森林 (NF) 的排放量进行比较.
- 为了计算净CO2eq排放量,考虑土壤气体流和森林地板碳积累.
主要方法:
- 实地测量N2O和CH4排放在两年内,在松树 (1,9和18岁) 和原生森林中进行.
- 计算净CO2eq排放量,包括土壤气体流和垃圾碳积累.
- 气体排放与土壤特性 (温度,,酸盐,充满水的孔隙空间) 之间的关系的统计分析.
主要成果:
- 土壤N2O排放量随着洛布洛利松树年龄的增加而减少.
- 4吸收率在松树林中变化而没有明确的模式,但在原生森林中更高.
- 9岁和18岁松树木的N2O排放量与原生森林相当.
- 成熟松树中的碳积累抵消了17%的N2O排放,并作为净CO2eq沉降器.
结论:
- 长达18年的洛布洛利松种植可以显著减少土壤N2O排放.
- 森林地板中的碳捕获,即老旧的松树,是温室气体排放的重要抵消机制.
- 成熟的松树林可以达到与本土森林相似的N2O排放水平,并作为净CO2eq沉降器发挥作用.
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