Arid Zone Research ›› 2021, Vol. 38 ›› Issue (3): 855-866.doi: 10.13866/j.azr.2021.03.27

• Ecology and Environment • Previous Articles     Next Articles

Wetland landscape evolution and its driving factors in Yinchuan

WANG Xiaofeng1,2(),YAN Yu3,LI Yuehao3,ZHANG Xing3,FU Xinxin3   

  1. 1. School of Land Engineering, Chang’an University, Xi’an 710054, Shaanxi, China
    2. Shaanxi Key Laboratory of Land Reclamation Engineering, Xi’an 710054, Shaanxi, China
    3. School of Earth Science and Resources, Chang’an University, Xi’an 710054, Shaanxi, China
  • Received:2020-10-10 Revised:2020-12-15 Online:2021-05-15 Published:2021-06-17

Abstract:

Wetland is the transitional zone of aquatic and terrestrial ecosystems, and it is an ecosystem with the highest biodiversity and productivity on Earth. Recently, under the influence of climate change and human activities, the wetland ecosystem has rapidly degraded. Spatio-temporal dynamic monitoring of wetland plays a vital role in the sustainable development of wetland landscape. The object-oriented classification method was used to extract the wetland landscape information in Yinchuan based on the Landsat TM/OLI remote sensing images from 1990 to 2019. The landscape index and redundancy analysis methods were used to analyze the dynamic changes and their driving factors in wetlands. The results showed that Yinchuan’s wetland area decreased from 264.86 km2 in 1990 to 241.32 km2in 2019, a decrease of 23.54 km2. The area of natural wetlands in 2019 decreased by 33.57 km2, while artificial wetlands increased by 10.03 km2. In the past 30 years, PD and AI of the landscape patterns have decreased, while the LSI and SHDI increased. This indicated that the wetland landscape patterns has undergone significant changes, fragmentation and aggregation degree gradually decreased, patch shape tended to be more complicated, and landscape diversity and heterogeneity increased. Twelve driving factors were selected for redundancy analysis, and socio-economic factors played a dominant role in the wetland landscape change, including nonagricultural population and aquatic products yield, the output value of various industries, and developed areas of cities. Altogether, natural factors such as precipitation, temperature, and hours of sunshine change could also impact the wetland landscape change, which is relatively weak. The research results provide important references to protect and rationally use wetlands resources in Yinchuan.

Key words: wetland, landscape pattern, evolution, driving factors, Yinchuan