High Level of Ammonium Nitrogen Increases Net Ecosystem Productivity in a Quercus liaotungensis Forest in Northern China
High Level of Ammonium Nitrogen Increases Net Ecosystem Productivity in a Quercus liaotungensis Forest in Northern China
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DOI：
10.3390/atmos13060889
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发表时间：
2022-05
期刊：
影响因子：
2.9
通讯作者：
Jing-Wen Qiu;Minghua Song;Yun Li;Chunmei Wang
中科院分区：
文献类型：
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作者：
Jing-Wen Qiu;Minghua Song;Yun Li;Chunmei Wang
森林生态系统对于陆地生态系统的碳（C）循环至关重要。氮 (N) 添加对森林生态系统碳固存的影响对于更好地了解氮可用性增加时的碳动态至关重要。我们在中国北方的辽东栎林中进行了为期六年的田间实验，研究氮添加对碳固存和净生态系统生产力（NEP）的影响。氮添加导致生物量碳储量显着增加（17.54%~48.62%），并改变了地上和地下生物量碳储量的分布格局，导致地下生物量碳储量比例较对照减少了9.64%~23.23%。年平均异养呼吸因额外的氮而显着增加（0.06-0.94 Mg C ha−1 yr1）。与对照相比，氮添加驱动的碳固存效率为7.12~33.50 kg C/kg N。高水平氮添加对生态系统碳固存的影响强于低水平氮添加。 NH4+-N，而不是NO3−-N，主导了生态系统碳固存的增加。我们发现辽东栎林起到了碳汇的作用。中国北方研究森林NEP的增加主要是由于氮添加引起的净初级生产力（NPP）的增加。大气氮沉降提高了碳封存效率，具体取决于氮沉降的速率和形式。
Forest ecosystems are vital to the terrestrial ecosystem’s carbon (C) cycle. The effects of nitrogen (N) addition on C sequestration in forest ecosystems are critical for better understanding C dynamics when facing an increase in N availability. We conducted a six-year field experiment to examine the effects of N addition on C sequestration and net ecosystem productivity (NEP) in a Quercus liaotungensis forest in northern China. N addition resulted in a significant increase in biomass C storage (17.54–48.62%) and changed the distribution patterns of above and belowground biomass C storage, resulting in a 9.64 to 23.23% reduction in the proportion of belowground biomass C compared with the control. The annual average heterotrophic respiration was significantly increased by the additional N (by 0.06–0.94 Mg C ha−1 yr1). In comparison with the control, the C sequestration efficiency driven by N addition ranged from 7.12 to 33.50 kg C/kg N. High-level N addition exerted stronger effects on ecosystem C sequestration than low-level N addition. NH4+-N, rather than NO3−-N, dominated the increase in ecosystem C sequestration. We found that Q. liaotungensis forest acted as a C sink. The increase in NEP in the study forest in northern China was mainly due to an increase in net primary productivity (NPP) caused by N addition. Atmospheric N deposition increased the C sequestration efficiency depending on the rate and form of N deposition.