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在稀薄森林中碳捕集的决定因素

Zichun Wang¹, Guangyu Wang², Yaoxiang Li³

¹College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, China; Department of Forest Resources Management, University of British Columbia, Vancouver, Canada.

The Science of the total environment

|August 16, 2024

概括

适度的森林稀释有效地增加了总碳密度. 较重的稀释能促进个体树木的生长,但不能促进整体的碳储存,而较轻的稀释则会损害生物多样性和树木的生存. 森林管理可以增强碳捕获.

科学领域:

森林生态森林生态
气候变化缓解缓解气候变化缓解
森林管理森林管理

背景情况:

全球气候变化需要加强森林碳储存能力.
了解森林碳密度的驱动因素,特别是在干扰后,对于有效的碳捕获至关重要.
森林生态系统面临着改变其碳平衡的破坏.

研究的目的:

调查各种稀释强度仅采摘干部对森林结构和碳密度的影响 (地表碳密度 - ACD,土壤有机碳库存 - SOCD,总碳密度 - TCD).
用随机森林分析来确定影响碳密度变化的关键变量.
通过结构方程建模 (SEM) 确定森林碳密度变化的驱动因素.

主要方法:

只有茎的收获在不同的稀释强度 (轻度:0-19.9%,中度:20-35%,重度:35.1-59.9%的树木被移除).
测量地表碳密度 (ACD),土壤有机碳储量 (SOCD) 和总碳密度 (TCD).
应用随机森林分析和结构方程建模 (SEM) 来分析影响变量和驱动因素.

主要成果:

适度稀释 (20-35%的树木被移除) 有效地增加了总碳密度 (TCD).
严重的稀疏 (35.1-59.9%的树木被移除) 加快了个体树木的生长,但没有补偿收获的碳损失.
轻微稀释 (砍伐0-19.9%的树木) 减少了物种丰富性,增加了树木死亡率,对碳密度产生了负面影响.
大型活树直接影响了ACD,而薄化通过改变树冠和变形树密度间接影响了ACD.
随着时间的推移,死树密度的增加对SOCD产生了负面影响,而较大的稀释强度则增强了SOCD.
树木高度,大型活树和树密度直接影响了TCD;通过改变针叶树的比率,稀释也间接控制了TCD.

结论:

适度稀释是一种有益的森林管理实践,可以提高温带森林的总碳密度.
必须仔细考虑稀释策略,以平衡碳捕获目标与对森林结构和生物多样性的影响.
了解稀释对各种碳池的直接和间接影响对于优化森林碳储存至关重要.

关键词:

碳密度碳密度碳密度驱动因素驱动因素森林的生长森林的生长森林结构森林结构稀释稀释稀释是一种

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