摘要
通过对额济纳绿洲几种植物的水势分析,结果表明,水势从小到大排序为:红砂<柽柳、苏枸杞、苦豆子<胡杨、梭梭、骆驼蓬<花花柴<沙拐枣。胡杨和柽柳水势日变化在5月和7月大体呈“V”型;9月份日变化大体呈直线型。不同植物对环境条件反应不同,乔木、灌木的水势与深层土壤中含水量密切相关,而草本对较浅层的土壤含水量相关。阔叶植物对大气中的水分相关性更强。植物水势与大气温度相关性最差。
Water potential for some dominant plant species in Ejin Oasis was analyzed by measurement of soil water potential, plant water potential. Water potential order in all species from the lowest to the highest was R. Soongoric< T. Ramosissima, L, ruthenicum, S. alopecuroides < P. Euphratica, H. ammodendron, P. Harmala< K. Caspia< C. caput-medusae. Generally, the diurnal variation of plant water potential for T. Ramosissima & P. Euphratica had a \!V[WT]\' shape from May to July, whereas linear shape in September. The tree and shrub water potential showed high correlation with deeper soil water potential, and the herb water potential was correlated with shallower soil water potential. Results indicate that these species water potential were poorest correlated with air temperature.
出处
《中国沙漠》
CSCD
北大核心
2005年第4期496-499,共4页
Journal of Desert Research
基金
国家十五攻关项目(20023081)
国家科技攻关项目(2004BA901A15)联合资助
