介绍了 MATL AB及其有关功能 ,并利用 MATL AB对宜川黄土丘陵区的空旷地、采伐地和油松林地 3类不同地表植被土壤水分长期观测数据进行综合分析研究。结果表明 ,油松林地土壤水分含量在土层深度 40—6 0 0 cm是三者中最低的 ,其主要用水层在 40— 6 0 0 cm之间 ,采伐地土壤水分在 0— 40 0 cm一般高于空旷地 ,40 0— 6 0 0 cm低于空旷地 ,空旷地地表土壤水分是三者中最低的 The paper introduced MATL AB and its related functions. By using the data of MATL AB, the long-term observation data of soil moisture in three types of surface vegetation in the open land, the cutting land and the Pinus tabulaeformis forest in Yichuang loess hilly region were comprehensively analyzed. The results showed that the soil water content of Pinus tabulaeformis forest was the lowest among 40-600 cm soil depth, the main water layer was between 40-600 cm, the soil water content was 0-40 cm Generally higher than the open area, 40 0-6 0 0 cm below the open area, the open surface soil moisture is the lowest of the three