| The ecosystem is the material basis and conditions for human survival and development,and is an irreplaceable precious resource.As the global climate change becomes more and more significant,the frequency of extreme weather increases,the destruction of the ecosystem structure caused by human activities,the phenomenon of the decline in the quality of the ecological environment become more and more obvious,and the problems are increasing day by day,which is serious for the sustainable development of humans and nature.Challenge.The Beijing-Tianjin-Hebei region,as the region with the largest economic scale and highest development level in northern China,has an important position in the regional ecological security pattern.Beijing,Tianjin and Hebei are geographically integrated and have a strong cultural heritage,and they have a strong synergistic and complementary advantage.However,the region is faced with a variety of ecological problems.With the increasingly perfection of remote sensing and geographic information system technology,the combination of the two has been widely used in ecological assessment research.Based on the RS/GIS platform,regional ecological conditions can be evaluated quickly,efficiently and conveniently.This paper combines RS/GIS technology and mathematical analysis methods to construct a set of ecological background maps of the ecosystem structure,quality and key services of the Beijing-Tianjin-Hebei region,and analyzes and evaluates the characteristics of its spatial and temporal changes.Focused on the analysis of the driving mechanism of the ecosystem change in the study area,and the proposed driving partition identification technology,the results show that:?1?The area of farmland,forest,grassland,water body and wetland ecosystem in the Beijing-Tianjin-Hebei region accounts for approximately 49.7%,20.7%,16.2%,and 3.4%of the study area,respectively.In the past 15 years,the urban area has increased significantly,and the farmland area has decreased significantly.?2?From 2000 to 2015,the average maximum vegetation coverage in Beijing-Tianjin-Hebei region was about 38.32%,and the annual average vegetation coverage growth rate was0.060/10a?P<0.01?,which accounted for 85.44%of the total vegetation coverage of the study area.There was an upward trend,and 14.56%of the vegetation coverage showed a downward trend.?3?The quality of various ecosystem service functions in Beijing-Tianjin-Hebei region shows a clear spatial distribution difference between northwest and southeast.The average amount of wind and sand fixation,water conservation,and soil retention were 5.61×108 t,74.58×108 m3,and 7.98×108 t,respectively,and the growth rates were 0.11 t hm-2 a-1,0.03×104 m3 km-2 a-1,1.08 t hm-2 a-1.?4?The overall climate of the growing season in the study area tends to be warm and humid,which provides good water and heat conditions for vegetation growth and development.Vegetation coverage is positively correlated with rainfall and temperature.Among them,the impact of rainfall on vegetation coverage is greater than that of temperature on vegetation coverage.The area where human activities positively affect vegetation coverage accounts for51.67%,and the area where negative interference affects 47.87%.Among them,the central urban agglomeration with Beijing and Tianjin as the core has obvious urban expansion phenomena that encroach on the original habitat,resulting in a decline in vegetation coverage and service functions in these areas.?5?In terms of driving factor zoning,the positive human interference type accounts for11.52%,mainly concentrated in Chengde,Zhangjiakou,Hengshui,Xingtai,etc.;the negative interference type accounts for 12.67%,distributed in the urban built-up areas of various cities;the rainfall promotion type accounts for 11.48%,concentrated in the Beijing-Baoding area in the Taihang Mountains;the non-climatic and human disturbances account for 58.25%. |
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