关键词: 盐渍化, 原油污染, 油葵, 相对生长率, 氮磷比, 抗氧化酶

Abstract: A comparative study was made on the community biomass, species richness, and compensation index in eastern alpine meadow of Tibetan Plateau under four levels of fertilization and seven levels of mowing, aimed to understand the responses of the community to different intensities of fertilization and mowing. Fertilization increased the aboveground biomass and reduced the species richness, while mowing increased the species richness but had little effects on the aboveground biomass. With increasing fertilization, the dominance of Cyperaceae and forb species gradually shifted to grass species. Fertilization also promoted the community compensation ability, but the ability after mowing differed along the fertilization gradient. In addition, the probability of overcompensation increased with increasing mowing intensity and decreasing mowing number along the fertilization gradient. Therefore, fertilization was the main factor for community compensation, and the mowing effect on the community characters depended on fertilization level.

Key words: salinization, crude oil pollution, Helianthus annuus, RGR, N/P ratio, antioxidant enzyme.