Spatial distribution of spectral reflectance of the typical seminatural grasslands in Japan (ex: Pleioblastus-dominated grassland, Zoysia-dominated grassland, and a mixed grassland with various plant species) measured with a portable spectroradiometer (MS-720, EKO Ltd., Japan) that has measurement wavelength region of 350-1050 nm and measurement interval of 3.3 nm (256 ch), and we interpolated spectral data to 700 ch/1.0 nm using the software Spectro Manager Version 1.6 (EKO Ltd., Tokyo, Japan). Measurements were conducted in four seasons (spring: April-May 2008, summer: August 2007, 2008, autumn: November 2008, winter: February 2008) at intersecting points on a 10 m mesh for each grassland. （藤荷田山生態観測試験地の半自然草地(シバ・アズマネザサ・造成草地等)のにおける、分光反射率の空間分布データ。ハイパースペクトルメータ（MS-720：波長域350-1050nm、3.3nmインターバル/256chを用いて、４季節で実施（春：2008年5月、夏：2007年と2008年の8月、秋：2008年11月、冬：2008年2月）。）