扎龙湿地水体N,P营养物质空间异质性研究

Study on the Spatial Variability of Water Nitrogen and Phosphorus in the Zhalong Wetland

在2003年夏季采集了扎龙湿地地表水样,结合GIS技术及地统计学原理,分析了TN,NH4+-N,TP及PO43-在湿地水体中的空间变异特征。通过半方差函数分析发现,TN,NH4+-N,TP及PO43-均受到结构性因素的影响,具有较小的块金值和较高的空间结构比例,表现出一定空间相关性变异特征,同时分形特征表明了其空间变异复杂性较低。应用普通克里格插值法绘制的含量分布图,反映出TN,NH4+-N,TP及PO43-具有一致的空间分布趋势,其与采样区水位变化显著的空间负相关性说明了水位空间变化是影响湿地N,P营养物质空间分异的结构性因素。

Water samples were collected in the Zhalong Wetland in summer 2003, and the spatial variability of TN, NH_4^+-N, TP and PO_4~(3-( was analyzed by applying geostatistics combined with GIS. The analysis of semivariogram indicated that TN, NH_4^+-N, TP and PO_4~(3-( in the Zhalong Wetland showed certain spatial-related variability with small nugget and high proportion of spatial structure influenced by a certain structure factors, and the fractal features reflected that the complexity of spatial variability is not remarkable. The maps coming from Ordinary Kriging optimal interpolation showed uniform spatial distribution pattern of TN, NH_4^+-N, TP and PO_4~(3-(, and the high negative spatial relationship with water depth in the sampling area illustrated that the variation of water depth was the structure factor controlling the spatial variability of nitrogen and phosphorus in the Zhalong Wetland.