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,P<0.01);TN、土壤有机质(SOM)质量分数呈显著正相关关系(r=0.62,P<0.05);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。
Nitrogen is essential for plant growth and development;therefore,it is of great significance to study the spatial distribution characteristics of nitrogen in soil supplied by recycled water.Soil tolal nitrogen(TN)is complex for its distribution and mechanism under the influence of hydrological conditions to a urban wetland.Taking Beijing Mencheng Lake Wetland Park as the study area,where the reclaimed water is the main water supply,we studied the spatial distribution characteristics of the total soil TN content using ArcGIS and Geostatistics.The results show that the total soil TN content is high in the study area with a large range coefficient of variation of47.35%.Among different plant communities in the area,the total soil TN content in typha community is the highest.The total phosphorus is closely correlated with TN(r=0.79,P<0.01);and soil organic matter is also obviously positively correlated with TN(r=0.58,P<0.05).Among the climate factors,temperature and humidity affect the distribution of total soil TN significantly in the study area.In addition,the soil TN measured at the reclaimed water outlet is higher than that in the other areas.With the increase of distance away from the outlet,the TN declines in general,and becomes stable.Our study indicates that vegetation plays an important role in adjusting soil nitrogen in the wetland treated with recycled water.
作者
熊凯
宫兆宁
张磊
赵文吉
Xiong Kai;Gong Zhaoning;Zhang Lei;Zhao Wenji(College of Resources Environment & Tourism, Capital Normal University,Beijing 100048, China;Key Laboratory of 3D Information Acquisition and Application of Ministry,Beijing 100048, China;Base of the State Laboratory of Urban Environmental Processes and Digital Modeling of Beijing, Beijing 100048, China)
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2017年第6期1829-1837,共9页
Journal of Jilin University：Earth Science Edition
基金
国际科技合作专项项目(2014DFA21620)~~
关键词
土壤
全氮
空间分异
北京门城湖
再生水
soil
total nitrogen
spatial distribution
Mencheng Lake,Beijing
reclaimed water
