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陕西关中地区大气氮湿沉降通量的动态变化

DOI: 10.11654/jaes.2014.12.016, PP. 2389-2394

Keywords: 大气氮沉降,湿沉降,关中地区

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Abstract:

为了对陕西关中地区大气氮沉降量进行估算,2009年11月至2010年10月对西安和杨凌两地进行了为期一年的湿沉降观测.结果表明:监测期内,西安、杨凌两地区年降雨量分别为620.5、532.3mm,西安ρ(NH4+-N)和ρ(NO3--N)平均值分别为3.058、2.356mg·L-1,杨凌ρ(NH4+-N)和ρ(NO3--N)平均值分别为3.990、2.709mg·L-1;季节变化上,西安监测点ρ(TIN)(总无机氮)和杨凌监测点ρ(NH4+-N)呈现春、冬季高于夏、秋季的趋势,而杨凌监测点ρ(NO3--N)则呈秋、冬季略高于春、夏季的趋势.西安、杨凌TIN沉降通量分别为24.791、28.894kg·hm-2,且均以NH4+-N为主导,分别占TIN的67.3%和56.3%.氮素沉降量与降雨量之间呈现正相关趋势,随着降雨量的增加,NH4+-N、NO3--N和TIN的沉降通量均明显增加.湿沉降输入农田的无机氮占施肥投入的比重相当大,在施肥中应予以考虑.

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