福建烤烟种植区大气氮素湿沉降研究

为研究大气湿沉降中氮素营养对福建烤烟生产的影响，通过对5个监测点降水样品的收集和分析，研究福建烤烟种植区大气湿沉降氮素状况。结果表明，福建烟区年降雨量在1134~1737 mm，总氮、硝态氮、铵态氮和有机氮年平均浓度分别为1.14 mg/L、0.37 mg/L、0.39 mg/L和0.38 mg/L；总氮沉降量在11.77~20 kg/(hm2?a)之间，平均为15.94 kg/(hm2?a)，硝态氮、铵态氮和有机氮各占1/3；沿武夷山脉从南到北，大气湿沉降氮的年平均浓度和沉降量均表现为下降趋势。不同监测点在1—2月和9—10月湿沉降中氮的浓度相对较高，有4个点的氮素沉降量主要集中在3—9月，长汀主要集中在上半年；烤烟生长季（2—7月）的大气湿沉降中的无机氮（铵态氮+硝态氮）、有机态氮和总氮分别占全年总量的44%~62%、33%~67%、44%~63%。大气氮素湿沉降量与降雨量之间呈乘幂型正相关，其决定系数平均为0.41。

Study on Atmospheric Nitrogen Wet Deposition in Fujian Tobacco Planting Area

The purpose of this paper was to study the effects of atmospheric nitrogen wet deposition on tobacco produced. Growing attention has been paid on atmospheric nitrogen （N） deposition in China for its rapid increase because of the sharply increasing emissions of nitrogenous pollutants in the last two decades. However, quantification of atmospheric N deposition in tobacco planting areas, which is related to acidification and eutrophication as well as the tobacco quality, is still rare. In this study, monitoring of N wet deposition at five sites in Fujian tobacco planting area was carried out in 2009. The annual precipitation 1134 mm to 1737 mm. Concentrations of total nitrogen （TDN）, （DON） were 1.14 mg/L, 0.37 mg/L, 0.39 mg/L and 0.38 mg/L, from 11.77 kg/（hm2o a） to 20 kg/（hm2o a）, with an average value ranged from NO3--N, NH4＋-N and dissolved organic nitrogen respectively. The total N wet deposition ranged of 15.94 kg/（hm2· a）. Both the concentrations and deposition decreased from the north to the south along the Wuyi Mountain. Higher N concentrations were found in January, February, September and October at all the five monitoring sites. Except Changting site, large parts of N deposition were concentrated on the warm season, from March to September. During the tobacco planting season （February to July）, inorganic N deposition （DIN）, DON and TN deposition accounted for 44%-62%, 33%-67%, and 44%-63% of that for the annum deposition, respectively. N deposition increased with theprecipitation at all monitoring sites, fitting a power equation （r2=0.41）.