The impact of land use/cover types on climate warming in southern China
中国南方不同土地利用/覆被类型对气温升温的影响

In this article we have analyzed the impact of land cover types on climate warming in southern China based on observation data of 136 reference meteorological stations from China Meteorological Bureau in Southern China,the 1:100000 national land cover data from the 1980s to 2005 and NCEP/DOE AMIP-ⅡReanalysis.We extracted the underlying surface of 3-km radius buffer zones around the meteorological stations in different historical periods,and distinguished the observational environment of the meteorological stations.Then,annual,seasonal and monthly changes of air temperature are analyzed.We compared the difference of temperature change at meteorological stations with different observational environments which are respectively cropland,built-up land and woodland,and drew some conclusions about the impact of land cover types on climate warming in southern China.The result shows that,in southern China,among the three main types of land cover in the study area,the changing trends of the annual average,annual average maximum and the annual average minimum temperature in built-up areas are most significant,while those in cropland area are moderate,and those in forest area are least significant.By analysis of OMR values which are observed minus data of NCEP/DOE AMIP-ⅡReanalysis,we found that the changing trend of annual average temperature in built-up land is still most significant(0.105℃/10a),followed by cropland area(0.056℃/10a),and forest area(-0.025℃/10a).So,it is concluded that forest plays an inhibitory effect in climate warming,while built-up land and cropland play an enhanced effect,and urban areas enhance the climate warming more than cropland.We also conclude that the changing trends of average seasonal and monthly temperature in woodland are less significant than those of any other land cover types.