Temporal and Spatial Variation of Wetland Resources in Nanliu River Delta and Its Driving Factors Based on Human Disturbance

Abstract

Wetland resources play an important role in maintaining the balance of surface ecosystem. Based on multi-source remote sensing images, this paper studies the spatial and temporal distribution characteristics and driving factors of wetland resources in Nanliu River Delta by using human disturbance index and "3S" technology. The results show that: (1) The total wetland area has shown an overall growth trend from 2005 to 2019, with the total wetland area increasing from 77.33 km2 in 2005 to 87.55 km2 in 2019. (2) Coastal wetland types have the fastest change rate, annual rate of 36.31%, followed by fish ponds and rice fields, the annual rate of 3.40% and 3.31% respectively. (3) The area of wetland is greatly affected by the change of river water and sediment and the change of management policy. (4) The degree of human disturbance to the coastal wetlands in the delta area increases year by year, and gradually develops to the coastal areas.

Keywords

• wetland
• anthropogenic interference
• driving forces
• nanliu river