关键词: 植被指数, 高光谱, 夏玉米, 模型, 干旱, 反射率, 一阶导数, 吸收光合有效辐射比

Abstract: Coal mining causes land subsidence and changes soil fertility. For a better land reclamation in mining area, including soil reconstruction and vegetation restoration, soil nutrient status in subsidence area should be examined. In this study, the subsidence area from Anjialing No. 3 underground coal mine in Pinglu District, Shuozhou City, Shanxi Province was taken as the research area. Soil samples of different profiles from four different plots (unmined area, subsided area 1, subsided area 2, and reclaimed area) were collected to analyze the contents of soil total nitrogen and organic matter. The spatial variation of those characters was examined using classic statistics and geostatistics methods. Soil total nitrogen and organic matter contents at the 0-20 cm layer in the subsided areas were lower than those in the unmined area. However, soil total nitrogen contents at deeper soil layers in the subsided areas were higher than those in the unmined area and an opposite pattern was found for soil organic matter. The soil organic matter content in reclaimed area was higher than that in the subsided areas. Total nitrogen contents at different soil layers in the reclaimed area did not show a clear regularity compared to the subsided areas. Land subsidence increased the variability of soil organic matter and total nitrogen at horizontal direction, whereas land reclamation decreased such spatial variability. Our results can provide a theoretical and technical reference for land reclamation in subsided lands in loess area.

Key words: the first derivative spectral reflectance, drought, vegetation index, summer maize, model., fraction of absorbed photosynthetically active radiation, reflectance, hyperspectral