Journal
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
Volume 121, Issue 6, Pages 1605-1616Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016JG003393
Keywords
nutrient limitation; N:P; wet deposition; ecological stoichiometry
Funding
- National Nature Science Foundation of China [31570471, 31290221, 31470506]
- Chinese Academy of Sciences Strategic Priority Research Program [XDA05050702]
- Program for Kezhen Distinguished Talents in Institute of Geographic Sciences and Natural Resources Research, CAS [2013RC102]
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Atmospheric wet nitrogen (N) and phosphorus (P) depositions are important sources of bioavailable N and P, and the input of N and P and their ratios significantly influences nutrient availability and balance in terrestrial as well as aquatic ecosystems. Here we monitored atmospheric P depositions by measuring monthly dissolved P concentration in rainfall at 41 field stations in China. Average deposition fluxes of N and P were 13.698.69kgNha(-1)a(-1) (our previous study) and 0.210.17kg P ha(-1)a(-1), respectively. Central and southern China had higher N and P deposition rates than northwest China, northeast China, Inner Mongolia, or Qinghai-Tibet. Atmospheric N and P depositions showed strong seasonal patterns and were dependent upon seasonal precipitation. Fertilizer and energy consumption were significantly correlated with N deposition but less correlated with P deposition. The N:P ratios of atmospheric wet deposition (with the average of 7740, by mass) were negatively correlated with current soil N:P ratios in different ecological regions, suggesting that the imbalanced atmospheric N and P deposition will alter nutrient availability and strengthen P limitation, which may further influence the structure and function of terrestrial ecosystems. The findings provide the assessments of both wet N and P deposition and their N:P ratio across China and indicate potential for strong impacts of atmospheric deposition on broad range of terrestrial ecosystems.
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