关键词: 土壤水分上升运动, 粒径, 蒸发, 生物炭

Abstract: The research progress of Wuliangsuhai wetland eutrophication over recent 20 years was reviewed. The eutrophic status of Wuliangsuhai wetland was summarized as follows: (1) The average contents of nitrogen (N) and phosphorus (P) in waters exceeded the Ⅴ grade of China National Surface Water Quality. Overall, the N and P contents were spatially higher in north and lower in south, and higher in west and lower in east. Locally, the features of spatial distribution were related to plant distribution. The overall characteristics of temporal distribution were influenced by the influent from Hetao region and air temperature. (2) N and P were enriched in sediments. In horizontal direction, the N content in sediments was higher in north and lower in south, and higher in west and lower in east. But the P content did not show any pattern. (3) The temporal and spatial distributions of algae were similar to that of N and P. In recent years, the excessive reproduction of algae often resulted in the bloom of Huangtai algae. (4) The organic matter in waters was significantly enriched and positively correlated with the N content spatially. (5) The organic matter in the sediments was mainly derived from terrestrial inputs and aquatic organisms. It had significant homology with N, being consistent with N in spatial distribution. The organic matter in the sediments was enriched significantly and became an important source of endogenous pollution. In future, studies on the mechanisms of eutrophication of Wuliangsuhai wetland should be strengthened, which may provide theoretical basis and technical support for the restoration of Wuliangsuhai wetland.

Key words: evaporation, particle size, biochar, soil water upward movement