摘要
试验共设计2个处理和1个对照,分别将土壤水势控制在-10～-20 kPa和-40～-60 kPa,对照为自然条件。选取土壤水势、日最高温度、日平均温度、日温差几个因素,分析各因素与桃树茎干日最大收缩量(MDS)之间的相关关系。分析表明,3月份各因子与MDS变化之间相关性由高到低的顺序为:日温差>日最高温度>日平均温度>土壤水势;4月份为:日温差>日平均温度>日最高温度>土壤水势;5月份为:日最高温度>日平均温度>日温差>土壤水势。结果表明,在一定条件下,土壤水分不是影响桃树茎干日最大收缩量变化的主要因素,MDS不能准确反映土壤的干旱程度以及土壤水分对植物的有效性。因此,以MDS作为灌溉控制指标具有很大的局限性。
This test designed two disposals,which kept the soil water potential at-10 kPa to-20 kPa and-40 kPa to-60 kPa,and one comparison disposal,which is under natural condition.With choosing the factors of the soil water potential,the daily maximum temperature,the daily average temperature and the daily temperature difference,the interdependence between each factor and maximum daily shrinkage（MDS） is analyzed.The analysis indicates that the subsequence of the correlation between each factor and MDS from high to low in March is the daily temperature difference,the daily maximum temperature,the daily average temperature,the soil water potential.In April,it is the daily temperature difference,the daily average temperature,the daily maximum temperature,the soil water potential.In May,it is the daily maximum temperature,the daily average temperature,the daily temperature difference,the soil water potential.The result indicates that under certain conditions,soil moisture is not the main factor of affecting DMS and DMS can not correctly reflect the degree of drought of soil and the validity of soil water to plants.Therefore,considering DMS as the guideposts of irrigation is highly limited.
出处
《节水灌溉》
北大核心
2011年第3期18-22,共5页
Water Saving Irrigation
基金
国家"十一五""863计划"项目现代节水农业技术创新平台(2006AA100223)"干旱半干旱地区水文生态与水安全学科创新引智基地"(B08039)
关键词
桃树
土壤水势
空气温度
茎秆日最大收缩量
peach tree
soil water potential
air temperature
maximum daily shrinkage
作者简介
贺军奇（1978-），男，博士，讲师，主要从事灌区水资源高效利用。E—mail：hjqtzjx@163．com
