【摘要】 伴随着羊草草地的退化演替过程中,草地土壤盐碱化程度逐渐加重,同时羊草种群的密度、高度、生物量逐渐降低。但是羊草叶片的抗氧化酶活性却出现特异性增加的现象,尤其是CAT的活性在羊草生长的各个时期以及年平均量都出现递增;POD活性虽然在年平均量呈现降低的趋势,但是在羊草生长的前期和末期也出现递增;SOD活性变化比较复杂,但是依然显示出,伴随着草地的盐碱化呈现先降低后增加的趋势。模拟盐碱胁迫也显示出,三种保护酶活性随着盐碱浓度的增加而逐步上升,呈现与野外相似的变化趋势。更多还原

【Abstract】 The density,height and biomass of the Leymus chinensis population declined along with the degenerated succession of the L.chinensis grassland and alkalization and salinization of the grassland soil.However,the protective enzyme activity of the L.chinensis leaves increases distinctly; especially the activity of CAT increases not only during the whole period of the growth of L.chinensis,but also annual average.Though declines in annual average,the activity of POD increases at the earlier stage and the later stage of the growth of L.chinensis.Though complicated,the activity of SOD shows a trend of increasing after first declining as the grassland degradation.Through the simulation experiment of saline-alkali stress,it also showed that the protective enzyme activity increased obviously with the enhancement of stress force.更多还原