覆盖层和底层的气添加不同地影响温带森林中的土壤微生物残留碳
Yuanqi Chen1,2, Yu Zhang3, Xu Zhang3
1Institute of Geographical Environment and Carbon Peak and Neutrality, School of Earth Sciences and Spatial Information Engineering, Hunan University of Science and Technology, Xiangtan, China.
Global change biology
|July 18, 2024
概括
大气中的沉积增加了土壤微生物残留物,特别是加上树冠. 地下添加可能低估了其对森林碳捕获的全部影响.
科学领域:
- 森林生态 森林生态
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
背景情况:
- 大气中 (N) 沉积对森林土壤微生物和有机碳产生影响.
- 微生物残留物,如氨基糖,是土壤有机碳 (SOC) 的关键组成部分.
- 覆盖层N沉积是主要的途径,但与底层N添加相比,其对微生物残留的影响还没有得到充分研究.
研究的目的:
- 调查N添加量和方式 (天棚与底层) 如何影响温带森林中的土壤微生物残留物.
- 为了比较树冠N沉积与地下N添加对土壤微生物残留物和SOC的影响.
- 了解沉积途径在森林碳循环中的作用.
主要方法:
- 10年的实地实验,在25和50公斤的N加值下进行了N加值,Nha-1年-1.1.
- 在温带宽叶森林中通过树冠和底层树木添加N.
- 测量了土壤氨基糖,微生物残留碳 (MRC),土壤有机碳 (SOC),微生物生物质,社区组成和活动.
主要成果:
- 添加N增加了土壤氨基糖和MRC度,但并没有增加它们的SOC比例.
- 高添加增加了上层土壤中的氨基糖和MRC,无论如何.
- 天花板N添加,但不是底层,显著增加了亚米诺糖和地下MRC.
- 土壤微生物生物质,社区组成和活动基本上没有受到影响.
结论:
- 沉积增强了微生物残留物,其影响取决于的数量和沉积途径.
- 覆盖层N沉积起着至关重要的作用,特别是在地下,突出显示间接的植物间接影响.
- 低估树冠N吸收和植物微生物碳动态,可能导致对N沉积下的森林碳捕获的不准确预测.
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