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干旱改变了地面生物质生产效率:来自两个欧洲树林的见解

Jingshu Wei¹, Georg von Arx², Zexin Fan³

¹School of Natural Resources and the Environment, University of Arizona, 1064 E Lowell Street, Tucson, AZ 85721, USA; Swiss Federal Institute for Forest Snow and Landscape Research WSL, Zuercherstrasse 111, CH-8903 Birmensdorf, Switzerland; CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun Town, Mengla County, Yunnan Province 666303, China.

The Science of the total environment

|February 8, 2024

概括

森林在干旱期间优先考虑木质生长,影响碳平衡. 生物质生产效率 (BPE) 动态,而不仅仅是碳流,对于理解森林碳汇至关重要.

科学领域:

森林生态森林生态
气候变化科学气候变化科学
生物地质化学生物地质化学

背景情况:

生物质生产效率 (BPE) 量化了对木质生物质的碳分配,这是森林碳平衡的关键指标.
了解BPE的时间动态和对干旱等极端事件的反应至关重要,但不太了解.
之前的研究经常量化了BPE大小,但没有量化其跨年变化或干旱反应.

研究的目的:

用实证方法量化地面BPE及其在欧洲树林中的年间变化.
通过使用长期的生态和气候记录,研究BPE和干旱之间的关系.
为了确定在干旱压力下,BPE动态是否与碳吸收 (GPP) 或碳分配 (ACI) 更接近.

主要方法:

结合了地表碳增量 (ACI) 的树环数据与总初级生产率 (GPP) 的联共变率 (EC) 数据.
在地面上计算的BPE是ACI与GPP的比率 (BPE = ACI/GPP).
利用每日解析的干旱指数来评估BPE对水量限制和极端干旱事件的反应.

主要成果:

在德国和丹麦的树林地区发现了BPE和干旱指数之间的显著负相关性.
在极端年份,季节早期的干旱使同一年的BPE减少了14-31%.
在一个案例中,夏末的干旱使干旱后一年的BPE减少了17%.
BPE的干旱应对反映了ACI更多的比GPP,表明水槽驱动的动力.

结论:

森林木质生长 (BPE) 在水限量,脱源 (GPP) 和水槽 (ACI) 动态下没有优先考虑.
仅以碳流来估计森林碳汇的大小和变异性可能是不准确的.
需要对多种生态系统进行进一步的研究,以充分了解BPE对极端气候事件的反应.

关键词:

碳排放的分配碳排放的分配应对气候变化的反应干旱的极端情况.埃迪的共变性埃迪共变性野生花 L 野生花毛初级生产率的生产率.树木的生长树木的生长

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