再生水补水条件下土壤全氮空间分布特征

发布时间：2018-04-16 11:29

本文选题：土壤 + 全氮　；参考：《吉林大学学报(地球科学版)》2017年06期

【摘要】：土壤中的氮素是植物生长发育的基础,由于城市湿地土壤受特殊水文条件影响,土壤全氮(TN)的分布规律和影响机制较为复杂,因此研究土壤TN的空间分布特征具有重大的生态意义。本文以再生水为主要补给水源的北京门城湖湿地公园为研究区,运用ArcGIS和地统计学对该区土壤TN的空间分布特征进行研究。结果表明:研究区土壤TN质量分数较高,差值明显,变异系数达47.35%;比较不同的植物群落区可知,香蒲群落区土壤TN质量分数最高。对影响研究区土壤TN分布的因素分析得出:土壤TN、全磷(TP)质量分数呈极显著正相关关系(r=0.81,P0.01);TN、土壤有机质(SOM)质量分数呈显著正相关关系(r=0.62,P0.05);气候因子中,湿度和温度对TN分布同样影响显著。水质参数中,再生水出水口处测得的土壤TN的指标数值更高,随出水口距离的增加,参数值总体呈下降趋势且逐步趋于稳定,说明植被对湿地土壤中氮素空间分布的调整具有重要作用。
[Abstract]:Nitrogen in soil is the basis of plant growth and development. Due to the influence of special hydrological conditions, the distribution and mechanism of soil total nitrogen (TNN) in urban wetland soils are complex.Therefore, it is of great ecological significance to study the spatial distribution of soil TN.In this paper, the spatial distribution of soil TN in Beijing Mencheng Lake Wetland Park was studied by ArcGIS and geostatistics.The results showed that the soil TN mass fraction was higher, the difference was obvious, the coefficient of variation was 47.35, and the soil TN mass fraction was the highest in different plant communities.The factors influencing the distribution of soil TN in the study area were analyzed. The results showed that there was a very significant positive correlation between the mass fraction of soil TNN and total phosphorus (TP), and a significant positive correlation between the mass fraction of soil organic matter (SOM) and the content of soil organic matter (0.81%), and the significant positive correlation between the content of soil organic matter (SOM) and the content of soil organic matter (0.62% P0.05), among the climatic factors,Humidity and temperature also have significant effects on TN distribution.Among the water quality parameters, the index value of soil TN measured at the outlet of reclaimed water is higher. With the increase of the distance between the outlet and the outlet, the values of the parameters generally show a downward trend and tend to be stable gradually.It shows that vegetation plays an important role in adjusting the spatial distribution of nitrogen in wetland soil.
【作者单位】：首都师范大学资源环境与旅游学院;三维信息获取与应用教育部重点实验室;资源环境与地理信息系统北京市重点实验室;
【基金】：国际科技合作专项项目(2014DFA21620)~~
【分类号】：S153.6

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