摘要
利用一元四次方程模型能很好模拟川旱地小麦不同耕作法的土壤水分动态及耗水量动态规律，根据回归曲线将土壤水分动态分为四个阶段，不同耕作法在不同阶段失墒量显然不同。小麦在整个生育期土壤失墒量趋势为：垄沟＋覆盖＞平播＋覆盖＞平播＞垄沟。同时认为，小麦生育前期耗水量对产量贡献甚微，生育后期耗水量对产量贡献较大。垄沟耕作在小麦生育前期比平播的水分损耗要多，垄沟的增产作用主要表现在生长后期，为了避免生长前期失墒量及耗水量较大，应该配合碎麦草覆盖，使垄沟耕作发挥巨大的增产作用。覆盖及垄沟耕作具有明显的增产效果，因而，应该积极推广冬小麦碎麦草覆盖耕作及垄沟耕作。
The dynamic changes of soil water and laws of water consumption in the field growth wheat with fourdifferent tillage method were simulated by the linear regression equation model in arid plain land .By the linear equation the dynamic changes of soil water are divided into 4 stages and the different tillages of wheat havedifferent consuming water amount in the same stage abviosely.The sequence of the water consumption of wheat in whole growth period are as follows:ridge tillage with stubbe mulch >conservational tillage with stubbe mulch>conservational tillage>ridge. At the same time,the relationship between wheat yield and water consumptionamount in earlier growth period is bigger than that in the latter period.the consuming water amount of ridge tillage in earlier stage is bigger than of the conservational tillage, and the increasing-yield effect of ridge tillage isresponsive to the latter stage of wheat.In order to avoid the consuming water of earlier stage,the ridge tillage should cooperated with stubbe mulch.
出处
《水土保持通报》
CSCD
北大核心
1994年第1期38-42,共5页
Bulletin of Soil and Water Conservation
基金
国家"七五"科技攻关项目
关键词
冬小麦
垄沟耕作
覆盖
水分动态
wheat ridge tillage mulch dynamic change consuming water law
