祁连山海北高寒草甸生态系统大气氮湿沉降动态变化特征

发布时间：2018-01-09 08:02

本文关键词：祁连山海北高寒草甸生态系统大气氮湿沉降动态变化特征　出处：《干旱区资源与环境》2016年03期 　论文类型：期刊论文

【摘要】：对祁连山海北高寒草甸地区2010年和2011年大气氮湿沉降观测分析发现,海北高寒草甸地区NH_4~+-N、NO_3~--N和TIN湿沉降年平均浓度分别为0.35 mg/L、0.27 mg/L和0.62mg/L,对应的湿沉降年总量分别为1.78kg/hm2、1.40kg/hm2和3.19kg/hm2。湿沉降氮浓度和湿沉降氮量年内均有明显的季节变化,湿沉降氮浓度表现出冬季高夏季低,而湿沉降氮量则为夏季高冬季低。NO_3~--N和NH_4~+-N湿沉降浓度与降水量分别呈极显著的逆函数和幂函数负相关关系(P0.001)。NO_3~--N和NH_4~+-N湿沉降量与降水量分别呈显著(P0.05)和极显著(P0.001)的线性正相关关系。NH_4~+-N与NO_3~--N湿沉降浓度和湿沉降量的比值与降水量均表现出弱的线性正相关关系(P0.10)。海北高寒草甸地区的NH_4~+-N、NO_3~--N和TIN湿沉降量与世界和我国各地的农田、森林、城市相比处于低值区,而与处在大气清洁、海拔稍高的我国丽江玉龙雪山地区、西藏林芝地区相比基本相仿。
[Abstract]:The observation and analysis of atmospheric nitrogen wet deposition in Haibei Alpine Meadow area of Qilian Mountains on 2010 and 2011 show that NH _ 4 ~ -N in Haibei Alpine Meadow area. The annual average concentrations of NO_3~--N and TIN were 0.35 mg / L 0.27 mg/L and 0.62 mg / L, respectively. The corresponding annual total wet deposition was 1.78 kg / hm ~ 2 and 3.19 kg / hm ~ (2) 路hm ~ (2), respectively. There were obvious seasonal changes in the concentration of nitrogen and the amount of nitrogen in wet deposition during the year. The concentration of nitrogen in wet deposition was high and low in summer and winter. However, the nitrogen content of wet deposition in summer is higher than that in winter and low. No _ 3- N and NH _ 4 ~ -N have a significant inverse function and power function negative correlation with precipitation, respectively (P 0.001). The wet deposition of N and NH4- N and precipitation were significant (P0.05) and extremely significant (P0.001), respectively. The ratio of NH _ 4 ~ -N to NO_3~--N wet deposition concentration and wet deposition amount showed a weak linear positive correlation with precipitation (P _ (0.10)). NH _ 4 ~ -N in Haibei alpine meadow area. The wet deposition of NO_3~--N and TIN is in low value area compared with farmland, forest and city in the world and our country, but it is in the area of Yulong Snow Mountain of Lijiang with clean atmosphere and higher altitude. The Linzhi region of Tibet is basically similar.
【作者单位】：中国科学院西北高原生物研究所;中国科学院大学;中国科学院高原生物适应与进化重点实验室;
【基金】：国家自然基金项目(31300385;31270523;31070437)资助
【分类号】：X51;X171
【正文快照】： 3.中国科学院高原生物适应与进化重点实验室,西宁810001)20世纪中后期以来,除大气CO2浓度升高可能导致全球变暖外,大气中另一个新近出现而又令人担忧的问题是随着工业、农业的发展,人类活动使排放到大气中的含氮化合物增加,并不断向陆地和水生生态系统沉降[1],这也引起国内外

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