摘要
本文依据系统的实测资料,提出了诊断作物水分亏缺状况的叶水势、气孔导度和细胞液浓度指标。在分析叶温的日变化规律在冠层垂直剖面上的分布、与土壤水分状况的关系的基础上,提出了诊断小麦和玉米缺水状况的叶——气温指标。结果表明,当小麦和玉米的叶——气温差分别大于1.1和0.8℃时已开始严重受旱。最后,讨论了以叶温为主要参数的作物受旱状况的综合诊断指标CWSI,CWSI在冬小麦拔节抽穗期和玉米拔节抽雄期分别大于0.4772和0.4557时已开始严重受旱。
In this paper, based on the systematic experiment data, the critical values of leaf water potential, stornatal conductance and cell sap concentration were presented for daignosing crop water state, and through analysing the daily varing laws of leaf temperature, and its distribution in the conopy profile, as well as the relationship between it and soil moisture content, the critical value of temperature difference between leaf and air were presented, too, for daignosing winter wheat and summer corn water deficit, state, The results showed that the serious drought would sviffered When the temperature differences were larger than 1.1 and 0.8℃ respectively for winter wheat and summer corn. At last, the synthelical index CWSI (crop Water stress Index) for daignosing crop water deficit state was discus.scd, the result showed that the serious drought would suffered when CWSI were larger than 0.4772 and 0.4557 respectively for wheat and corn.
出处
《西北水资源与水工程》
1992年第4期30-38,共9页
Northwest Water Resources & Water Engineering
基金
国家自然科学基金
