Influence of Landscape Factors on Water Quality of Ganjiang River
The impact of non-point source pollution on water quality is difficult to identify.Studying the impact of land-scape factors(land use types and topographic factors)on river water quality helps to clarify the impact of non-point source pollution on water quality and better water resources management.Based on Redundancy Analysis(RDA)and Partial Redun-dancy Analysis(pRDA),this study analyzed the changes of water quality in the Ganjiang River during the wet and dry sea-sons,and analyzed the effects of three types of landscape factors(environmental variables)of land use composition,landscape index and topographic factors in the 1 km buffer zone on water quality.The results showed that the seasonal differences of dissolved oxygen and cadmium concentration were obvious,and the wet season was significantly lower than the dry season(P＜0.05).The spatial heterogeneity of different water quality indicators is large.The contribution of various landscape factors to water quality is:landscape index(13.9％～14.4％)＞topographic data(4.0％～15.9％)＞land use type(3.7％～4.9％).The influ-ence of landscape factors on water quality is higher in wet season than in dry season.The largest patch index(LPI),landscape shape index(LSI)and average patch shape(SHMN)were the main landscape indices affecting the water quality of Ganjiang River.Elevation(HI)was the main topographic factor affecting water quality.Unused land(UN),grassland(GRA),forest land(FOR)and building land(BU)were the main land types affecting water quality changes.The research results can provide important theoretical basis for the effective management of river water quality.
Landscape factors,redundancy analysiswater qualityGan River
NETL
NSTL
万方数据
