Ten-year determination of atmospheric phosphorus deposition at three forested sites in Japan
Ten-year determination of atmospheric phosphorus deposition at three forested sites in Japan
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DOI：
10.1016/j.atmosenv.2019.117247
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发表时间：
2020-02-15
影响因子：
5
通讯作者：
Chiwa, Masaaki
中科院分区：
文献类型：
--
作者：
Chiwa, Masaaki
大气磷（P）沉降是了解自然和半自然生态系统动态的重要组成部分。然而，有关大气磷沉降的信息有限。在这里，我们显示了 2009 年至 2018 年 10 年间日本三个森林地点（郊区森林 (S)、农村森林 (R1) 和北部农村森林 (R2)）的长期大气 P 沉降。研究期间收集了每个地点约 200 个大量降水样本，除了主要离子外，还对总磷 (TP) 进行了分析。 S、R1和R2地点的年TP沉积量分别为0.28+/-0.06、0.21+/-0.05和0.12+/-0.04kg P ha(-1) yr(-1)，并且大到足以影响森林流域的P预算。主成分分析表明，生物源是农村林地大气磷的主要贡献者，而人为源可能对郊区林地大气磷的影响更大。过去十年中，S 点的年总磷沉积量显着减少。 S站点的年TP沉降量与年氮沉降量之间的显着关系表明，TP沉降量的减少可能是由于人为排放的减少造成的。
Atmospheric phosphorus (P) deposition is an important component for understanding the dynamics of natural and semi-natural ecosystems. However, information about atmospheric P deposition is limited. Here, we show the long-term atmospheric P deposition at three forested sites, a suburban forest (S), rural forest (R1), and northern rural forest (R2) in Japan for 10 years from 2009 to 2018. Approximately 200 samples of bulk precipitation at each site were collected during the study period and total P (TP) was analyzed in addition to major ions. Annual TP deposition at sites S, R1, and R2 was 0.28 +/- 0.06, 0.21 +/- 0.05, and 0.12 +/- 0.04 kg P ha(-1) yr(-1), respectively, and were large enough to affect P budgets in a forested watershed. Principal component analyses indicated that biogenic sources are the primary contributor to atmospheric P at rural forest sites, whereas anthropogenic sources may have a larger effect on atmospheric P at suburban forest site. Annual TP deposition at site S significantly decreased over the past decade. The significant relationship between annual TP deposition and annual nitrogen deposition at site S indicates that the decrease in TP deposition could be caused by a decrease in anthropogenic emissions.