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树苗在叶子化过程中很容易吸收NO₂

Meng Yao^1,2, Ronghua Kang^1,3,4, Erik A Hobbie⁵

¹CAS Key Laboratory of Forest Ecology and Silviculture, Institute of Applied Ecology, Chinese Academy of sciences, Shenyang, Liaoning, China.

Plant, cell & environment

|September 16, 2025

概括

森林的树冠吸收大气中的二氧化 (NO2),这是一个重要的输入. 土壤中添加对不同树种的NO2吸收有不同的影响,树叶是同化NO2的主要储存地点.

科学领域:

森林生态森林生态
生物地质化学循环是什么
大气中的化学成分

背景情况:

森林树冠的二氧化 (NO2) 吸收是森林生态系统中的重要,但量化不足的输入.
了解 (N) 添加如何影响叶子NO2吸收以及随后在不同树器官内分配同化NO2对于准确的生态系统建模至关重要.

研究的目的:

在不同的土壤N条件下,量化叶子NO2吸收和不同树器官的N分配.
为了研究NO2与土壤同化所产生的物种特异反应,添加了N.
估计树冠NO2吸收对温带森林N总预算的贡献.

主要方法:

在四种温带树种的树苗上进行了15NO2化实验:Fraxinus mandshurica,Pinus koraiensis,Quercus mongolica和Larix gmelinii.
在各种树器官 (叶子,茎,根) 中测量了15N回收,以确定同化和分配模式.
在对土壤N添加的反应中分析了口腔密度和叶面积,以解释差异性的NO2吸收.

主要成果:

叶子NO2吸收的15N总回收在物种之间差异很大 (9%到74%在光线条件下).
土壤N添加改变了15N回收,增加了Quercus mongolica,但减少了Larix gmelinii,与口腔密度和叶面积的变化有关.
叶子是同化NO2的主要吸收器,占15N总回收的60%至97%,表明最初的储存在叶子中.

结论:

树叶的NO2吸收受树木需求和特定物种的生理反应的影响.
温带森林的树冠可以吸收大量大气中的NO2 (0.51 ± 0.07 kg N ha-1 y-1).
这项研究提高了对大气N沉积和森林生态系统循环的理解,为大规模N预算模型提供了有价值的数据.

关键词:

15NO2 烟雾化处理叶子上的NO2吸收.的分配的分配.树木的树苗树苗的树苗

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