升高的CO2改变了在成熟温带森林中获得营养的相对地下碳投资
Michaela K Reay1,2,3, Emma J Sayer4,5, Andrew Smith6
1School of Geography, Earth and Environmental Science, University of Birmingham, Birmingham B15 2TT United Kingdom.
概括
在高二氧化碳 (CO2) 的情况下,成熟的树显示出更多的地下营养获取策略. 这些适应,包括根生长和改变的碳排放,支持森林的提高生产力和它们作为碳吸收器的作用.
科学领域:
- 森林生态 森林生态
- 植物生理学 植物生理学
- 生物地质化学生物地质化学
背景情况:
- 森林作为碳汇,部分减轻人为二氧化碳排放.
- 成熟树木在高二氧化碳 (eCO2) 的情况下适应营养获取的能力对于持续生长至关重要.
- 树木可以采用"自己做" (根植投资) 或"外包" (微生物协会) 营养吸收策略.
研究的目的:
- 在eCO2.2下研究成熟树中地下营养获取策略的可塑性.
- 确定成熟树木是否可以调整C投资以支持在模拟的未来大气条件下增长和营养获取.
主要方法:
- 在温带森林中,对成熟的树 (Quercus robur L.) 施加高水平的二氧化碳 (+140 ppm) 4 年.
- 细根分枝,根碳排泄和生菌菌 (ECM) 生物质和营业额的量化变化.
- 分析了根排泄物和代谢组合的组成.
主要成果:
- 在eCO2.2下,细根分枝的频率增加了73%.
- 根碳排泄量增加了63%,C:N比率更高,特别是在生长季节之外.
- 在叶落期间,ECM生物量增加了17%,ECM的营业额增加了近四倍.
结论:
- 成熟的树在eCO2.2下的地下营养获取策略中表现出显著的可塑性.
- "做自己"和"外包"策略的组合受到上调监管,并根据季节动态变化.
- 这些地下适应措施支持提高净初级生产率,突出了温带森林在全球碳循环中的作用.
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