摘要
本文研究了高寒草地3种立地条件下垂穗披碱草(Clinelymusnutans)在春季萌动过程中根系碳水化合物和保护酶活性的变化,结果表明:(1)入冬时根系中碳水化合物贮量高、保护酶活性强的牧草春季萌动早、生长快、抗寒性较强。(2)当春季气温波动式回升时,牧草根系中可溶性糖含量、SOD(超氧化物歧化酶)和POD(过氧化物酶)活性随气温上升而下降,随气温下降而上升。其中火烧地牧草根中SOD和POD酶活性一直保持较高水平,并对温度变化反应敏感,而抗寒性也较强。因此春季高寒山区牧草根内的代谢改组(增加可溶性糖)和酶系统的调节(增加SOD、POD活性)是其对生态环境适应的重要生理反应。
The experiments were conducted to study changes in content of Carbohydrate and activities of protecting enzyme in root of Clinelymus nutans planted in differently treated soils during the germination in spring; The results showed:(1) The more the forage's root kept Carbohydrate the higher the activities of protecting enzyme were in winter,the earlier it ger-minated and the more hardy it was in spring.(2) The contents of soluble sugar an activities of SOD, POD in root of Alpine forages were reduced with increasing of temperature and raised with decreasing of temperature. The forage planted in fired soil was more resistant to coldness because high level of SOD and POD activities in root were keeped and quickly increased by temperature drop. So change in Carbohydrate metabolism and adjustment of enzyme system were an important physiological re- sponses of forage to ecological environment.
出处
《生态学报》
CSCD
北大核心
1996年第4期402-407,共6页
Acta Ecologica Sinica
基金
国家自然科学基金