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中国西南地区亚热带常绿林中六种植物物种氨排放潜力的时间变异性。

Temporal variability of ammonia emission potentials for six plant species in an evergreen subtropical forest in southwest China.

作者信息

Cui Juan, Wang Zhangwei, Zhang Xiaoshan, Mulder Jan, Zhang Meigen

机构信息

Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.

University of Chinese Academy of Sciences, Beijing, 100049, China.

出版信息

Environ Sci Pollut Res Int. 2017 Apr;24(11):10808-10818. doi: 10.1007/s11356-017-8650-0. Epub 2017 Mar 13.

Abstract

The temporal variability of leaf ammonia (NH) emission potentials (the ratio of leaf tissue ammonium to proton concentration) and nitrogen (N) pools of six dominant plant species were investigated at the Tieshanping (TSP) forested catchment, southwest China. The results showed that the NH emission potentials and N pools presented small variations among seasons, which were mainly controlled by plant species and the leaf age. Also, high emission potential in one species did not correspond to high tissue N content. Specifically, the Chinese fir (Cunninghamia lanceolata) had higher NH emission potential (mean: 46.2) but lower N content (mean: 1.6% of Dw). The leaf privet (Ligustrum quihoui Carr.) was with the moderate emission potential (15) and the highest N content (2.7% of Dw) on average, which for the Masson pine (Pinus massoniana) were both low. Overall, the emission potentials of the six species were too low (<200) to build up a sufficiently high NH partial pressure in the leaves. Therefore, the Masson pine dominant subtropical forest at TSP acts as a sink for the atmospheric NH, indicating that using the N flux in throughfall only may significantly underestimate the N income of the ecosystem. The results are informative for future modeling of plant-atmosphere NH exchange and estimating N budget in local or regional scales.

摘要

在中国西南部的铁山坪(TSP)森林集水区,对六种优势植物叶片氨(NH)排放潜力(叶片组织铵与质子浓度之比)和氮(N)库的时间变异性进行了研究。结果表明,NH排放潜力和N库在季节间变化较小,主要受植物种类和叶龄控制。此外,一个物种的高排放潜力并不对应高组织N含量。具体而言,杉木(Cunninghamia lanceolata)具有较高的NH排放潜力(平均值:46.2)但较低的N含量(平均值:干重的1.6%)。女贞(Ligustrum quihoui Carr.)叶片平均具有中等排放潜力(15)和最高的N含量(干重的2.7%),而马尾松(Pinus massoniana)的这两项指标均较低。总体而言,这六个物种的排放潜力过低(<200),无法在叶片中积累足够高的NH分压。因此,TSP以马尾松为主的亚热带森林是大气NH的汇,这表明仅使用穿透雨中的N通量可能会显著低估生态系统的N收入。这些结果为未来植物 - 大气NH交换建模以及估算局部或区域尺度的N预算提供了信息。

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