陕北黄土区狼牙刺水势研究

Study on plant moisture stress of Sophora viciifolia in the Loess Area North of Shaanxi province

采用压力室水势仪,测定了陕北黄土区狼牙刺2～3年生小枝的水势。以柠条作对照,作了植物水势日变化、月变化动态研究。并分析了水势同光合有效辐射、大气温度、空气相对湿度(从CID-301PS光合测定仪获取)之间的相关关系。结果表明:狼牙刺水势日变化呈单峰曲线,最高值出现在12:00前后;一年中,从植物生长初期至盛期,水势绝对值表现出不断增加的趋势;狼牙刺水势同光照、气温有显著负相关性,与空气相对湿度有显著正相关性,而与植物年龄无密切关系。水势对比研究表明,狼牙刺较柠条耐旱。

This paper measured the plant moisture stress of 2~3 year branch of Sophora viciifolia in Loess Area of the North of Shaanxi Province.Analyzed the daychange and monthchange of plant moisture stress (PMS) of Sophora viciifolia;established the equation between PMS and climates elements.The conclusion is:Sophora viciifolias daychange is parabola,the minimum peak value takes place 12clock;during the whole year PMS of Sophora viciifolia increases bit by bit.PMS has close relation with plant physiology and environment,but no clear relation with plants age.By comparison between the PMS of Caragana korshinskii and Sophora viciifolia,found that Sophora viciifolia could endure drought more than Caraganar korshinskii.