关键词: 核桃, 钾素含量, 叶片, 光谱

Abstract: Based on the thermal band data of TM/ETM⁺ and by using mono-window algorithm, this paper studied the distribution pattern and dynamic characteristics of heat island landscape in Xi’an from 1995 to 2006. In the study period, there was an obvious urban heat island effect in Xi’an, and the thermal field spatial distribution pattern was identical with the builtup areas in the City. With the urbanization process of Xi’an, its thermal environment pattern presented a trend of increasing heterogeneity. In the eastwest and northsouth directions through the center of Xi’an, the temperature profile had a close relationship with the land use/land cover. Construction land surface had the highest temperature, while water area had the lowest one. The relationship between the land surface temperature and the land use/land cover was in the order of construction land > unused land > cropland > grassland > woodland > water area. The surface temperature showed a positive correlation with the NDBI index, and a negative correlation with the NDVI index.

Key words: Juglans regia, foliar, potassium content, spectrum.