摘要
在适宜土壤水分 (70 %θf)、中度干旱 (5 5 %θf)和严重干旱 (4 0 %θf)等 3种土壤水分条件下研究 84K杨树的蒸腾特性及抗旱适应性。结果表明 :杨树的蒸腾速率与土壤含水量密切相关 ,其总耗水量、总生物量的大小均为适宜土壤水分 >中度干旱 >严重干旱 ,总WUE在中度干旱下最高 ,严重干旱下最低 ;蒸腾速率的日变化是环境因子综合作用的结果 ,其中大气因子对杨树蒸腾速率的影响主要受土壤水分含量的控制。在干旱条件下杨树的抗旱性与SOD活性及K+ 含量之间关系不明显 ,杨树不具备耐旱植物的显著特征 ;由此建议 84K杨树不宜在黄土高原地区大面积栽植 ,应栽植在土壤水分条件较好的立地条件下。
Under three soil water levels, i. e., fitted soil water content(7.0%) , medium(55%) and serious drought stress(40%),respectively. Transpiration characteristic and drought resistance adaptability by imitated soil drought of Loess plateau are studied. The results showed that the transpiration rate of poplar leaves is closely related to soil water content. The total water consumption and biomass are: fitted soil water content>medium drought>serious drought, and total water use efficiency was highest at medium drought level; lowest at serious drought level; change of transpiration rate are affected syntheticly by environmental factors, the effect of air factors to transpiration rate is controlled by soil water content. The relation of drought resistance of poplar with superoxide dismutase (SOD) activity and K^+ content is not significant, indicating that poplar dose not have the character of drought resistance plants; From results, it can be concluded that poplar is not suitable to plant widely in loess plateau area and only fit to favorable soil water condition.
出处
《西北林学院学报》
CSCD
北大核心
2004年第3期7-10,23,共5页
Journal of Northwest Forestry University
基金
国家自然科学基金 ( 90 3 0 2 0 0 5 )
中国科学院知识创新基金 (KZCX1 0 6)
关键词
土壤水分
杨树
蒸腾变化
抗旱适应性
poplar
soil water content
transpiration rate
drought resistance
