关键词: 盐度卫星, 盐度卫星, 农业应用, 遥感监测, 海洋渔业, 土壤湿度

Abstract: Nutrients contents, pH value and soluble salts of 0-20 cm soil layer of 422 soil samples from open vegetable field and greenhouse in Xi’an were analyzed to study the effect of planting years on soil fertility, salinization and pH value. The results showed that the content of organic matter significantly decreased in open field soil with the increase of planting years, had no significant change in greenhouse, and increased significantly in solar greenhouse. The content of available N had no significant change in open field and greenhouse soil, however, it increased obviously in solar greenhouse soil. The content of available P in open field soil had no significant change, but significantly increased in greenhouse soil and solar greenhouse soil. Soil available K content decreased evidently in open field, and had no significant change in greenhouse and solar greenhouse soil. Overall, soil nutrient content in facility vegetable soil increased continuously, and the accumulation of nutrient was obvious, which was related to the overuse of fertilizer. It was suggested that fertilizer application in facility vegetable production should be strictly controlled in order to avoid fertilizer waste and nvironmental pollution. There was no significant change in the content of nitrate and soluble salts in open field and facility vegetable soil, but the nitrate content in facility vegetable soil was 2.2-2.3 times of that in open field soil, which showed that the accumulation of nitrate and soluble salts was obvious and there was a potential adverse effect on vegetable production, so the fertilizer application should be controlled. With the increase of planting year, pH value in open field and facility vegetable soil had no significant change, and there was no significant difference between them.