Analysis of Lake Area Changes and Driving Factors in Nam Co and Selin Co from 1976 to 2021
Lakes play an important role in the water cycle and balance,and are extremely sensitive to cli-mate change.The analysis of lake area change and its driving factors in the Qinghai-Xizang Plateau is of great significance to reveal the plateau climate change.The areas of Nam Co and Selin Co lakes were ob-tained based on the Landsat remote sensing images from 1976 to 2021.Mathematical statistics were used to analyze the change characteristics of lake areas,temperature and precipitation,and the influence of tem-perature and precipitation on the change of lake areas was discussed.The results showed that:(1)The lake areas of Nam Co and Selin Co showed significant growth trend(P<0.01),with an increase rate of 2.90%and 36.30%,respectively.Abrupt change of the lake areas occurred in 2001 and 2002,respectively.The variation coefficient of the lake areas of Nam Co was smaller(CV=1.64%)than that of Selin Co(CV=12.65%).(2)The annual average precipitation and temperature in Nam Co and Selin Co watershed in-creased significantly.(3)The change of lake areas in Nam Co was positively correlated with temperature and precipitation,and was affected by both.The lake area of Selinco has a significant positive correlation with air temperature,and no significant correlation with precipitation.The accelerated melting of ice and snow caused by increasing temperature is the main reason for the rapid expansion of Selin Co.These results could provide the theoretical basis for the study of lake evolution mechanism and the formulation of the pro-tection of ecological environment in alpine region.
Area of lake waterClimate changeRemote sensingTrend analysesMutation test
NETL
NSTL
万方数据
