基于MODIS数据的榆林土壤水分研究
发布时间：2019-04-21 17:48
【摘要】：土壤水分状况对农作物生长具有重要意义,遥感监测能够准确、快速地获取土壤水分状况。本文在前人研究的基础上,对比模型特点及研究区域性质,认为处于旱季时的榆林地区植被覆盖低,适合用表观热惯量模型。本文数据源为榆林地区2013年10月25日、11月28日和2014年4月25日的白天与晚上的MODIS-L1B影像,基于ENVI软件平台,以表观热惯量模型为定量反演依据,得到三幅榆林地区表观热惯量图,并以此为依据,从时间与空间两方面分析榆林地区土壤水分状况,并得出结论如下:1.在时间上,榆林地区经过雨量充沛的夏季后,土壤水分状况良好,但随着时间的推移,土壤水分减少严重,这主要与该地区的降雨量关系密切。2.在空间上,榆林地区土壤水分呈现从东南向西北减少的趋势,而这主要与当地的土壤质地、气候、地质地貌等密切相关。东南部区域以壤土为主,保水能力良好,西北部区域以砂土为主,保水能力差,东南部与西北部的过渡区域以砂壤土为主,保水能力一般;气候上长城沿线以北属中温带干旱气候和重半干旱气候,长城以南属北暖温带半干旱气候;地质地貌上由于西北部为风沙区,地势高而平坦,易受到西北风的侵蚀,土壤易干燥,东南部为黄土丘陵沟壑区,地势复杂且低,受西北风影响较弱,正是这些原因,榆林土壤水分在空间上才呈现由东南向西北减少的趋势。但结合土地利用类型图发现,有林地覆盖的风沙区与无植被覆盖的绵沙区,土壤水分状况相当,由此可以看出,植树造林对于防风固沙、保持土壤水分的作用和意义。
[Abstract]:Soil moisture status is of great significance to crop growth. Remote sensing monitoring can obtain soil moisture status accurately and quickly. On the basis of previous studies, this paper compares the characteristics of the model and the regional properties, and considers that the vegetation cover in Yulin area in dry season is low, which is suitable for using the apparent thermal inertia model. The data source of this paper is the daytime and evening MODIS-L1B images from October 25, November 28, 2014 and April 25, 2014 in Yulin area. Based on the ENVI software platform, the apparent thermal inertia model is used as the basis for quantitative inversion. Based on three maps of apparent thermal inertia in Yulin area, the soil moisture status in Yulin area is analyzed in both time and space, and the conclusions are as follows: 1. In terms of time, the soil moisture in Yulin area is in good condition after abundant rainfall in summer, but with the passage of time, the soil moisture decreases seriously, which is closely related to the rainfall in this area. 2. In space, the soil moisture in Yulin area decreases from southeast to northwest, which is closely related to the local soil texture, climate, geology and physiognomy. The southeastern region is dominated by loam, with good water retention capacity, while the northwest region is dominated by sandy soil, with poor water retention capacity, and the transition area between southeast and northwest is dominated by sandy loam soil, with a general water retention capacity. Climate on the north of the Great Wall belongs to the middle temperate arid climate and heavy semi-arid climate, south of the Great Wall belongs to the north warm temperate semi-arid climate; Geomorphologically, because the northwest is a sandy area with a high and flat terrain, it is easy to be eroded by the northwest wind, the soil is easy to dry, and the southeast is a loess hilly and gully area. The terrain is complex and low, and it is weak affected by the northwest wind, which is precisely the reason. The soil moisture of Yulin decreased from southeast to northwest in space. However, according to the land use type map, it was found that the soil moisture status of the sandy area covered by woodland was the same as that of the sandy area with no vegetation cover. Therefore, the function and significance of afforestation for preventing wind and fixing sand and maintaining soil moisture were found out.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S152.7
本文编号：2462422
[Abstract]:Soil moisture status is of great significance to crop growth. Remote sensing monitoring can obtain soil moisture status accurately and quickly. On the basis of previous studies, this paper compares the characteristics of the model and the regional properties, and considers that the vegetation cover in Yulin area in dry season is low, which is suitable for using the apparent thermal inertia model. The data source of this paper is the daytime and evening MODIS-L1B images from October 25, November 28, 2014 and April 25, 2014 in Yulin area. Based on the ENVI software platform, the apparent thermal inertia model is used as the basis for quantitative inversion. Based on three maps of apparent thermal inertia in Yulin area, the soil moisture status in Yulin area is analyzed in both time and space, and the conclusions are as follows: 1. In terms of time, the soil moisture in Yulin area is in good condition after abundant rainfall in summer, but with the passage of time, the soil moisture decreases seriously, which is closely related to the rainfall in this area. 2. In space, the soil moisture in Yulin area decreases from southeast to northwest, which is closely related to the local soil texture, climate, geology and physiognomy. The southeastern region is dominated by loam, with good water retention capacity, while the northwest region is dominated by sandy soil, with poor water retention capacity, and the transition area between southeast and northwest is dominated by sandy loam soil, with a general water retention capacity. Climate on the north of the Great Wall belongs to the middle temperate arid climate and heavy semi-arid climate, south of the Great Wall belongs to the north warm temperate semi-arid climate; Geomorphologically, because the northwest is a sandy area with a high and flat terrain, it is easy to be eroded by the northwest wind, the soil is easy to dry, and the southeast is a loess hilly and gully area. The terrain is complex and low, and it is weak affected by the northwest wind, which is precisely the reason. The soil moisture of Yulin decreased from southeast to northwest in space. However, according to the land use type map, it was found that the soil moisture status of the sandy area covered by woodland was the same as that of the sandy area with no vegetation cover. Therefore, the function and significance of afforestation for preventing wind and fixing sand and maintaining soil moisture were found out.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S152.7
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