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作 者 ：周瑞莲, 赵哈林

期 刊 ：植物生态学报 1995年 19卷 4期 页码：345-351

关键词：牧草；营养含量；酶活性；抗寒性；

Keywords:Forage, Nutrient content, Enzyme activities, Cold resistance,

摘 要 ：本文研究了秋季高寒山区垂穗披碱草(Clinelymus nutans)根系中碳水化合物、蛋白质含量和过氧化氢酶(CAT)和超氧化物歧化酶(SOD)活性变化及与牧草抗寒性的关系。结果表明，秋季随着气温的下降，牧草根系中碳水化合物和可溶性蛋白质含量增加，CAT和SOD活性增强。其中火烧地的全期平均碳水化合物、可溶性蛋白质含量和CAT、SOD活性明显高于未火烧地，总增幅度也较大。秋季牧草根系中碳水化合物和可溶性蛋白质含量增加是多年生牧草贮藏能量物质安全越冬和翌年再生芽萌动的能量需要，而CAT和SOD活性的增强可阻止低温下细胞中氧自由基的积累，使植物生物膜系统免受伤害，是决定植物抗寒性的另一重要因子。火烧地牧草春季萌动早，长势强，产量高，秋季其根系中碳水化合物和可溶性蛋白质含量高及CAT和SOD活性强是重要原因。

Abstract:The autumnal changes in contents of carbohydrate, soluble protein and the enzyme activities of catalase (CAT) and superoxide dismutase (SOD) in the root of Clinelymus nutans (griseb) Nevski were studied in the cold mountain areas, The results showed that both the contents of carbohydrate and soluble protein and the enzyme activity of the CAT and SOD increased with the temperature decrease in Autumn and early Winter; and these four attributes were higher in the forage root collected in the burned grassland than that in the non-burned grassland. Since the high contents of carbohydrate and protein in the forage root at the end of Autumn could provide energy for forage to resistant cold in Winter and provide nutrients for forage ger mination in the following year, the forage in the burned grassland grew better than that in the non-burned grassland. The high enzyme activity of the CAT and SOD in the Autumn was also related to a high resistance to low temperature.

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