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岸边的缓冲器减轻了清除对下游代谢率的下游影响
Maria Myrstener1, Larry A Greenberg2, William Lidberg1
1Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden.
Journal of environmental management
|March 6, 2025
概括
森林砍伐的影响流生态系统超出了当地地区. 狭窄的河岸缓冲区 (<15米) 允许这些影响向下游传播,改变河流的生产力和新陈代谢.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 林业林业 林业 林业 林业
背景情况:
- 森林砍伐显著改变了河流的非生物条件,包括温度,光线和营养投入.
- 现有研究证实,由于河岸缓冲区狭窄或不存在,对当地河流生态系统过程的影响.
研究的目的:
- 调查清除效应对河流生态系统过程的下游传播.
- 评估不同河岸缓冲宽度对这些下游影响的影响.
主要方法:
- 比较生物膜和整个河流代谢率在河头河流的上游,内游和下游最近的清除切割在瑞典北部.
- 分析了具有不同缓冲宽度 (<10m和≥15m) 的流.
主要成果:
- 生物膜总初级生产率 (GPP) 在夏季在薄缓冲区 (<10m) 的溪流下游增加,但由于高呼吸,生态系统的整体生产率下降.
- 生物膜GPP在秋季下游下降,再次导致生态系统生产率下降.
- 宽的缓冲区 (≥15m) 大大减轻了纵向变化,除了高细沉积物负载的溪流.
结论:
- 对河流生态系统的切断效应延伸到下游,特别是当河岸缓冲区狭窄 (<15米) 时.
- 下游影响与营养度和切割区内的局部反应的大小有关.
- 大约6%的瑞典森林溪流可能会受到最近砍伐的下游影响.
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