摘要
地温与春旱是黑龙江省农业生产的重要限制因子。2009年与2010年5月的气候异常对农业生产与管理产生显著影响。研究地表温度格局与动态变化规律及其对农业生产的影响,将为农业相关部门指导农耕提供科学依据。利用MODIS数据,对2009年和2010年5月中旬的两期地表温度(LST)数据进行分析,建立温度矢量空间格局;分析导致地表温度格局变化的成因。结果表明:(1)2009年和2010年5月的LST存在明显的空间格局差异。2009年5月的比2010年5月LST均值高约6.8K。(2)地表温度变化受下垫面状况影响显著。不同的土地利用类型对LST的贡献不同。(3)不同的土壤类型在旱涝年份对地表温度影响不同,黑土和黑钙土,团粒结构性好,田间持水量能力强,保水能力好,耐旱抗涝的能力比其他的土壤强得多,对LST的保持贡献最大;土壤的含水量与LST成正相关。(4)地势较低时,地表温度受多种因素的共同作用,DEM变化对LST作用不大;随着地势的增加,DEM成为影响地表温度的主要因素。
Land Surface temperature and drought are the important limiting factors on agricultural production in Heilongjiang Province.Abnormal climate of May 2009 and 2010 had a significant impact on agricultural production and management.Patterns and dynamics of temperature variation and the impact on agricultural production,agriculture-related sectors will provide the scientific basis for farming.By using MODIS data,the land surface temperature data of May 2009 and 2010 were analyzed.The two images were divided 5 levels by density segmentation and mask processing technology,and then the temperature pattern vector space was established.This paper discussed the character of patches of land surface temperature with different level after the temperature zoning by using the analysis method of landscape pattern.On the base of analysis,it discussed the reason for change of land surface temperature（LST） pattern.The results show that：（1） there was a clear spatial LST pattern differences between 2009 and 2010,in May.The average LST of 2009 is about 6.8 K higher than 2010;（2） LST is significantly affected by the underlying surface conditions,different land use types contribute to different LST;（3） different soil types in the drought years have the different impact on surface temperature,black soil and chernozem had a good structural aggregate,strong field capacity,water retention ability,the ability of drought waterlogging of these soils is much better than the other,and to make the greatest contribution to keeping the LST,soil moisture was positively correlated with LST;（4） in the low-lying,the LST was affected by many factors,the change in DEM has the little influence on the LST.With the increase in terrain,DEM is the main factors affecting land surface temperatures.
出处
《水土保持研究》
CSCD
北大核心
2012年第2期66-70,287,共5页
Research of Soil and Water Conservation
基金
哈尔滨市科技局科技创新人才基金项目(RC2010QN002051)
东北农业大学博士启动基金项目(190151)
关键词
黑土带
地表温度
反演
空间分析
black-soil zone
land surface temperature
retrieve
spatial analysis
