摘要
为了明确与布尔哈通河距离不同的缓冲带的景观格局对河流水质的影响程度,以布尔哈通河上、中和下游河段10处采样点为中心,建立了其外边界与采样点距离0.5 km、1.0 km、1.5 km和2.0 km、带宽都为0.5 km的4个缓冲带,计算各缓冲带及其集水区的景观指数;采用主成分分析方法,筛选出主要水质指标;采用冗余分析方法,确定与主要水质指标关系密切的有效缓冲带,分析有效缓冲带景观指数与主要水质指标之间的关系;采用多元线性回归方法,建立有效缓冲带的以景观指数为自变量、以水质指标为因变量的回归方程。研究结果表明,其外边界和内边界分别与采样点距离为1.5 km和1.0 km的缓冲带的景观指数对布尔哈通河水体的水质指标有较强的解释能力,因此该缓冲带为影响河流水质的有效缓冲带;布尔哈通河水体中的氨氮含量、硝酸盐氮含量分别与该缓冲带的最大斑块指数显著负相关;其硝酸盐氮含量分别与该缓冲带的蔓延度指数、斑块粘合度显著负相关。
In order to clarify the impact of the landscape pattern of the buffer strips at a different distance from the Buerhatong River on the water quality,10 sampling points in the upper,middle and lower reaches of the Buerhatong River were taken as the center,their outer boundaries of four buffer strips with a distance of 0.5 km,1.0 km,1.5 km and 2.0 km from the sampling points and their widths were both 0.5 km were established.The landscape indexes of each buffer strips and catchment area were calculated.The principal component analysis method was used to screen out the main water quality indicators.The redundancy analytical method was used to determine the effective buffer strip whether or not closely related to the main water quality indicators,to analyze the relationship between the effective buffer strip’s landscape indexes and the main water quality indicators.Adopt multiple linear regression method was used to establish a regression equation of effective buffer strip with landscape index as independent variable and water quality index as dependent variable.The research results showed that the landscape index of the buffer strip whose outer boundary and inner boundary were 1.5 km and 1.0 km away from the sampling points,respectively,has a strong ability to explain the water quality indicators of Buerhatong River,therefore,this buffer strip was an effective buffer strip that affected water quality of the river.The contents of ammonia nitrogen and nitrate nitrogen in the water body of the Buerhatong River were significantly negatively correlated with the maximum patch index of the buffer strip;the content of nitrate nitrogen was significantly negatively correlated with the spread index and plaque adhesion of the buffer strip.
作者
刘婉锐
朱卫红
姜明
齐鹏
LIU Wanrui;ZHU Weihong;JIANG Ming;QI Peng(Key Laboratory of Wetland Ecological Functions and Ecological Security,School of Geographic and Ocean Sciences,Yanbian University,Yanji 133000,Jilin,P.R.China;Key Laboratory of Wetland Ecology and Environment,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130102,Jilin,P.R.China)
出处
《湿地科学》
CSCD
北大核心
2020年第6期750-758,共9页
Wetland Science
基金
国家自然科学基金项目(41830643)资助。
关键词
景观格局
缓冲带
水质指标
布尔哈通河
landscape pattern
buffer strip
water quality indicator
Buerhatong River
