摘要
冷蒿干物质累积高于差巴嘎蒿 ,水分胁迫出现时差值更显著 ;差巴嘎蒿可溶性蛋白质在土壤含水量为 10 %时即开始大量分解 ,冷蒿分解的时间稍后 (在土壤含水量 7%时 ) ;正常土壤含水量条件下冷蒿硝态氮含量和硝酸还原酶活性高于差巴嘎蒿 ,极端干旱时两种牧草上述指标均降至很低且数值相近 ;冷蒿在土壤水分轻度胁迫时脯氨酸大量累积 ,累积量可达胁迫前的 8.2倍 ,差巴嘎蒿只达原来的 2 .2倍 ;缺水使冷蒿可溶性糖大量累积 ,冷蒿达胁迫前的 1.2 9倍 ,差巴嘎蒿只达胁迫前的 0 .37倍。
The higher accumulation of dry substances in the Artemisia frigida over A. halodendron is aggrandized by water stress. Considerable amount of soluble protein in the A. halodendron begins to be decomposed when the soil moisture is reduced to 10%, while that in the Artemisia frigida begins to be decomposed at lower soil moisture (7%). At the normal soil moisture conditions, the Artemisia frigida has more content of nitrate nitrogen and the activity of reductase of nitrate than A. halodendron . The content of nitrate nitrogen and activity of reductase of nitrate in both species are greatly reduced, to approximately the same level, at hyper arid conditions. Artemisia frigida experiences large amount of proline accumulation at lighter soil water stress, which can reach as high as 8.2 times the protein accumulation without water stress, while A. halodendron can only increase by 2.2 times. Insufficiency of water leads to considerable accumulation of soluble sugar, it can increase by 1.29 times in the Artemisia frigida and 0.37 times in the A. halodendron compared with those without water stress.
出处
《中国草地》
CSCD
2001年第1期32-36,共5页
Grassland of China
基金
中国科学院寒区旱区环境与工程研究所知识创新工程项目(CACX210031)
国家“九五”重点攻关课题(96-920-13-02)
中国科学院沙坡头沙漠试验研究站开放基金(200025)资助
关键词
水分胁迫
冷蒿
差巴嘎蒿
溶质累积
Water stress
Artemisia frigida
A.halodendron
Accumulation of soluble substances
