玉米秸秆覆盖对春小麦田土壤物理性状的影响

为了明确生物覆盖对塔里木盆地绿洲区土壤性能的影响,采用田间试验研究了玉米秸秆不同覆盖处理方式对土壤容重、温度及含水量的影响。结果表明,覆盖处理、立秆处理都较常规处理降低了土壤容重。在春小麦播种期和分蘖期,覆盖处理的5cm土层温度最低,较常规处理的分别低2.13℃和1.79℃;15cm土层温度较常规处理的分别低2.36℃和1.90℃;土层加深10cm土壤温度的最高点和最低点都延迟3h出现。土壤含水量表现为0～10cm土层立秆、覆盖处理的土壤含水量均较常规处理的高,而10～20cm土层则表现为立秆、覆盖处理的土壤含水量均较常规处理的低。

Effects of Maize Straw Mulching on Soil Physical Properties in Spring Wheat Fields

The field experiments were made to study the changes of soil temperature,bulk density and soil moisture content under the different mulching.The results showed that mulching and straw standing treatment dicrease soil bulk density compared with the check treatment.In sowing and tillering of spring wheat,the soil layer which the depth of 5 cm,mulching soil temperature is lowest,compared with conventional tillage low than 2.13℃ and 1.79℃;soil temperature of 15 cm was 2.36℃ and 1.90℃ lower on straw mulching than conventional tillage.Between the soil layers,the highest and lowest points of soil temperature delayed 3 hours with the deepening of soil layer.Water content of soil in the layers of 0~10 cm,the cover and pole treatment higher than conventional tillage,but in the layers of 10~20 cm,soil moisture of the cover and pole treatment lower than conventional tillage.