Meng Yao, Ronghua Kang, Erik A Hobbie, Qing-Wei Wang, Lei Duan, Jan Mulder, Yuqi Liu, Jin Li, Jingran Ma, Chao Wang, Yunting Fang
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引用次数: 0
摘要
森林冠层对二氧化氮(NO2)的吸收被认为是一个潜在的重要氮输入。然而,氮素添加如何影响叶片对NO2的吸收和同化NO2在树木不同器官中的分配,目前还缺乏定量研究。以3年树龄的水曲柳(Fraxinus manshurica)、红松(Pinus koraiensis)、蒙古栎(Quercus mongolica)和落叶松(Larix gmelinii)为研究对象,进行了15NO2熏蒸试验,测定了不同树木器官的同化情况。光照条件下15N的总回收率在9% ~ 74%之间,且因种而异。随着土壤N添加量的增加,蒙古松的15N恢复增加,而羊草的15N恢复减少,这与两种植物的气孔密度和叶面积对土壤N添加量的响应相反。这表明叶片NO2吸收量可能与树氮需求有关。叶片是15NO2氮的主要吸收源,占总回收量的60% ~ 97%,这表明大部分叶片同化的NO2最初储存在叶片中。研究结果表明,温带森林林冠层对大气NO2的吸收能力为0.51±0.07 kg N ha-1 y-1,可为大尺度模拟估算林冠层NO2吸收量提供参考。这些数据提高了对大气和森林生态系统之间氮循环的认识。
Tree Saplings Readily Take Up NO2 During Foliar 15NO2 Fumigation.
Forest canopy nitrogen dioxide (NO2) uptake is recognised as a potentially important N input. However, how N addition influences foliar NO2 uptake and allocation of assimilated NO2 in different tree organs has been poorly quantified. We conducted a 15NO2 fumigation experiment using 3-year-old saplings of Fraxinus mandshurica, Pinus koraiensis, Quercus mongolica (Q. mongolica) and Larix gmelinii (L. gmelinii) and measured assimilation into different tree organs. Total 15N recovery ranged from 9% to 74% in the light and varied with species. With soil N addition, 15N recovery increased in Q. mongolica but decreased in L. gmelinii, which we attributed to opposite responses of stomatal density and leaf area between these two species to soil N addition. These indicate that foliar NO2 uptake amounts are likely associated with tree N demand. Leaves were the dominant sink for N derived from 15NO2 and accounted for 60% to 97% of total recovery, suggesting that most foliar-assimilated NO2 is initially stored in leaves. Our study indicates that tree canopies could assimilate 0.51 ± 0.07 kg N ha-1 y-1 atmospheric NO2 in temperate forests, which provides references for model large-scale modelled estimates of canopy NO2 uptake. These data improve the understanding of N cycling between atmosphere and forest ecosystems.
期刊介绍:
Plant, Cell & Environment is a premier plant science journal, offering valuable insights into plant responses to their environment. Committed to publishing high-quality theoretical and experimental research, the journal covers a broad spectrum of factors, spanning from molecular to community levels. Researchers exploring various aspects of plant biology, physiology, and ecology contribute to the journal's comprehensive understanding of plant-environment interactions.