Subjects: Geosciences >> Geography submitted time 2024-03-01 Cooperative journals: 《干旱区研究》
Abstract： In the context of new urbanization development, the coordinated development of economy and ecology in Gonghe County, Qinghai Province, which is a key node in the construction of the Lanxi urban agglomeration and a typical desert area that is ecologically fragile. It is of great significance to China in accelerating the construction a new development pattern and the implementation of the Innovation Demonstration Zone of Sustainable Development Agenda in Hainan Prefecture . Based on the land use data of 2000, 2010 and 2020, this study utilizes the InVEST model to explore the spatial and temporal distribution and effect change characteristics of habitat quality in Republican County from 2000 to 2020, and further investigate the influencing factors and their effects on habitat quality using geographic probes and geographical weighted regression (GWR). The results show that: (1) The overall habitat quality in Republican County from 2000 to 2020 showed an upward trend, and the mean values of habitat quality were 0.612, 0.626, and 0.627, respectively, and there were obvious regional differences in the spatial distribution of habitat quality, and the spatial pattern showed a trend of high in the north and low in the south. (2) The main driving factors affecting habitat quality in Gonghe County were the mean annual temperature (TEM) and normalized vegetation index (NDVI), and the interaction between the factors has a greater influence on the spatial differentiation of habitat quality than a single factor, with TEM interacting strongly with Shannon's evenness index (SHEI) and Shannon's diversity index (SHDI). (3) The GWR model quantified the different driving characteristics and strengths of each driver on habitat quality at the spatial level, with TEM having a negative effect on habitat quality, with the negative effect mainly concentrated in the northern and eastern parts of the republic. The positive effect of gross domestic product (GDP) on habitat quality increased by 30% compared to 2000, and the photovoltaic in Tala Shoal promoted the synergistic development of eco-industry in Gonghe County. The results of the study can provide a scientific basis for decision-making to promote local economic construction and ecological protection in arid areas.The results of the study can provide scientific decision-making basis for promoting local economic construction and ecological environmental protection in arid areas.
Subjects: Geosciences >> Atmospheric Sciences submitted time 2023-03-28 Cooperative journals: 《干旱区研究》
Abstract： Evapotranspiration (ET) is the total flux of water vapor transported by vegetation and the ground as a whole to the atmosphere. As an important part of energy balance and water cycle, ET affects the growth and development of plants and regulates climate by influencing atmospheric circulation. Using MODIS image data combined with digital elevation model data and meteorological data, this work applied ArcGIS spatial analysis and mathematical statistics to study the temporal and spatial characteristics of ET in the Shaliu River Basin of Qinghai Lake in the past 20 years from 2000 to 2019. The correlation between ET and meteorological factors such as air temperature, precipitation, and relative humidity and its topographic effect was also explored. Results show that: (1) the annual average ET in the Shaliu River Basin of Qinghai Lake is between 379.7 and 575.4 mm, and the average ET is 501.9 mm. The overall trend of fluctuation increases significantly with the number of years (P<0.05), and the linear slope is 5.9 mm·a-1. (2) From a spatial perspective, the average ET in the Shaliu River Basin of Qinghai Lake has significant spatial differences and shows a distribution pattern of“high in the middle and low at both ends,”that is, the ET in the source area and the downstream estuary delta area is lower than that in the middle reaches. The order is as follows: alpine meadow belt > alpine cold desert belt > alpine grassland belt. The areas with a relatively significant increase in ET are mainly distributed in the estuary delta area in the lower reaches of the basin, accounting for 9.7% of the basin area. Meanwhile, the areas with a relatively slight increase occupy the main body of the basin, accounting for 81.2%. (3) The annual ET is related to the annual average temperature, and the annual precipitation is significantly positively correlated with the annual average relative humidity. Warming is the fundamental driving force for the increase in ET. (4) The annual ET showed an “increase-decrease-increase”trend with the increase in the slope, but the overall difference between the slopes is not evident. Except for the smallest plane ET in different slope aspects, the differences in annual ET among the other slope aspects are small. The annual ET increases sharply at first and then gradually with the altitude. The above results show that in the past 20 years, the warming and humidification of the climate in the Shaliu River Basin of Qinghai Lake has led to an increase in ET. However, the band increase is small.
Hits
Hits
Downloads
Comment