摘要
为探讨哈尼梯田生态系统天人合一的水分和营养元素的利用模式,揭示哈尼梯田生态系统氮素时空变化规律,明确土地利用对氮浓度的影响,为哈尼梯田的水环境保护和可持续发展提供科学依据。以元阳县全福庄小流域为研究对象,应用Kriging空间插值法分析了该系统地表水氮素的时空分布特征。结果表明:(1)除NO_3^--N浓度在夏季和冬季呈强变异外,其他N浓度在不同季节的变异系数均小于100%,表现为中等程度变异。(2)梯田中下部TN、NO_3^--N和NH_4^+-N浓度变幅都较大,分别为0.103~0.849,0.010~0.143,0.052~0.446mg/L,森林地表水中TN、NO_3^--N和NH_4^+-N浓度的变幅都相对较小,分别为0.108~0.471,0.003~0.102,0.058~0.164mg/L。(3)TN、NO_3^--N和NH_4^+-N各季节的块金系数均小于50%,各季节均有较强的空间自相关性。TN、NO_3^--N和NH_4^+-N各季节的变程均在1 000m以内,表明各指标各个季节分别在不同尺度范围内分布连续,存在空间自相关性。(4)通过Kriging插值法得知,不同季节TN、NO_3^--N,NH_4^+-N地表水浓度从整体上为村庄>梯田>河流>森林的分布规律。
To explore the unity use patterns of water and nutrients in Hani terrace,reveal the spatial and temporal variation of nitrogen,clarify the impact of land use on nitrogen concentration,and provide scientific basis for water environment protection and sustainable development,we used QuanFu zhuang watershed as the research object,analyzed the characteristics of spatial and temporal distribution of surface water nitrogen.The research showed that（1）Except for the strong variation of NO3^--N concentration in summer and winter,the coefficients of variation of other N concentrations in different seasons were less than 100%,and showed a moderate variation.（2）The variations of the concentration of TN,NO3^--N and NH4^＋-N concentration in the lower part of the terraced fields were（0.103～0.849,0.010～0.143,0.052～0.446 mg/L）relatively large,and the variations of the concentration of TN,NO3^--N and NH4^＋-N concentration in forest surface water were（0.108～0.471,0.003～0.102,0.058～0.164 mg/L）relatively small.（3）The nugget coefficients of TN,NO3^-—N,and NH4^＋-N were less than 50% in each season,and showed a strong spatial correlation in each season.The variation ranges of TN,NO3^-—N,and NH4^＋-N were all within 1 000 min each season,indicating that the variation was distributed continuously in different scales in each season and there was spatial autocorrelation.（4）Through Kriging interpolation,the overall TN,NO3^--N,and NH4^＋-N concentration in surface water of different seasons ranged as village〉woodland〉terrace〉rivers.
作者
闵惠琳
宋维峰
MIN Huilin, SONG Weifeng(College of Ecology and Soil ＆ Water Conservation, Southwest Forestry University, Kunming 65022)
出处
《水土保持学报》
CSCD
北大核心
2018年第3期235-241,共7页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目"基于氢氧同位素技术的哈尼梯田水源区土壤水分运移规律研究"(41371066)
关键词
哈尼梯田
四素同构
氮素
时空分布
地统计分析
Hani terrace
four-in-one ecological elements
nitrogen
temporal and spatial distribution
geosta- tistical analysis
