回归等值线图在分析旱地蔬菜全生育期土壤水分动态变化规律中的应用

为了探究半干旱地区不同作物布局中种植甘蓝的耗水特征,本试验引入玉米、谷子、菜豆、大豆、马铃薯与甘蓝构建三年轮作系统,设置8种轮作组合,利用回归等值线图分析不同轮作方式处理下甘蓝全生育期土壤水分动态变化规律的差异。结果表明:以甘蓝为当年生作物附以不同的前茬处理,前一年茬口的不同对当年生甘蓝全生育期土壤含水量动态变化的影响较大,在各时期水分贮量分布产生的差异中占主导地位,前两年茬口的不同对其造成的影响较小。前一年种植作物分别为:菜豆、甘蓝、大豆、马铃薯时,甘蓝全生育期土壤水分动态变化分别呈现:不闭合峰、斜鞍形、半鞍形、闭合峰的分布;前一年种植相同作物附以前两年不同的茬口处理,对当年生甘蓝生育期内土壤含水量的时空动态变化并未造成明显的影响。该结果对当地作物类型的选择、耕作制度及作物布局的调整具有一定的指导意义。

Application of Regression Isogram to Dynamic Analysis for cabbage in Semi-arid Areas of Soil Moisture Variations With Time and Space

This study explored cabbage planting water consumption characteristics of different crop distribution in the semi-arid area. In the experiment,corn,millet,beans,soybean,potato and cabbage were introduced to build crop rotation system for three years,setting up the eight kinds of crop rotation combination. We analyzed the differences of cabbage soil moisture dynamic change rule in the whole growth periods under different rotation treatments by regression level curves analysis. The results showed that different fore-rotating crop had a great influence on the dynamic change of cabbage soil moisture content in the whole stages with different preceding treatment,which played an important role in different periods of the moisture distribution,but different before last crop had a small influence on the dynamic change of cabbage soil moisture content in the whole stages. Last year,when planting crops were beans,cabbage,soybeans,potato respectively,cabbage soil moisture dynamic change in the whole stages respectively presented： unclosed peak,oblique saddle,half-saddle,closed peak; different before last crop and same last crop had no significant effect on the dynamic change of cabbage soil moisture content in the whole stages. The results have a certain guiding significance for the choice of the local crop types,cropping system and the adjustment of crop layout.