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利用西峰黄土高原土壤水分含量和冬小麦千粒重资料,首先分析了0～200cm土层土壤水分的分布特征,再利用相关性统计的方法分析了不同深度土壤水分含量与冬小麦千粒重的相关关系,并计算了通过显著性检验的不同深度土壤水分的增产效应。结果表明:土壤水分垂直变化明显;时段不同,土壤水分对冬小麦千粒重影响的深度不同,3～5月,影响深度有逐渐下移的趋势,至5月份,100cm以下土壤水分对冬小麦千粒重的影响最为关键;进入7月份以后,土壤水分开始进入蓄墒阶段,7～11月的水分储备对下年冬小麦千粒重影响明显,特别是11月前后深层土壤水分储备量与下年冬小麦千粒重相关性显著。研究发现对冬小麦千粒重影响效果最好的是中下层土壤水分含量,并且愈到生育期后期,深层土壤水分含量所发挥的作用愈明显。这就表明了旱作农业区冬小麦对土壤水分的消耗规律,从而,我们在规划种植时更应该考虑深层土壤墒情。
Based on the data of soil water content and 1000-grain weight of winter wheat in the Xifeng Loess Plateau, the distribution characteristics of soil moisture in 0 ~ 200cm soil layer were analyzed firstly. Correlation analysis was used to analyze the relationship between soil moisture content and 1000-grain weight of winter wheat at different depths. Effect of Soil Moisture Increment at Different Depths by Significance Test. The results showed that: the vertical variation of soil moisture was obvious; in different periods, the depth of soil moisture had different effects on the 1000-grain weight of winter wheat. From May to May, the depth of influence had a gradual downward trend. By May, the effect of soil moisture below 100 cm on the 1000-grain weight of winter wheat After July, the soil moisture began to enter the stage of soil moisture storage. The water storage from July to November affected obviously the thousand-grain weight of winter wheat next year. Especially, the deep soil water storage before and after November was significantly correlated with the thousand-grain weight of winter wheat. The study found that the effect of 1000-grain weight of winter wheat is the best in the middle and lower soil moisture content, and to the late growth stage, the role of deep soil moisture content play the more obvious. This shows the law of soil moisture consumption in winter wheat in rainfed agricultural areas, so we should consider deep soil moisture in plan planting.