邱野, 王瑄. 耕作模式对坡耕地土壤水分和大豆产量的影响[J]. 农业工程学报, 2018, 34(22): 128-137. DOI: 10.11975/j.issn.1002-6819.2018.22.016
    引用本文: 邱野, 王瑄. 耕作模式对坡耕地土壤水分和大豆产量的影响[J]. 农业工程学报, 2018, 34(22): 128-137. DOI: 10.11975/j.issn.1002-6819.2018.22.016
    Qiu Ye, Wang Xuan. Effects of tillage patterns on soil moisture and soybean yield in sloping fields[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2018, 34(22): 128-137. DOI: 10.11975/j.issn.1002-6819.2018.22.016
    Citation: Qiu Ye, Wang Xuan. Effects of tillage patterns on soil moisture and soybean yield in sloping fields[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2018, 34(22): 128-137. DOI: 10.11975/j.issn.1002-6819.2018.22.016

    耕作模式对坡耕地土壤水分和大豆产量的影响

    Effects of tillage patterns on soil moisture and soybean yield in sloping fields

    • 摘要: 为了探讨北方土石低山地区不同耕作模式对坡耕地的土壤水分特征及其对作物产量的影响,以10°坡耕地大豆田为研究对象,监测了传统耕作(CT)、免耕(ZT)、免耕秸秆覆盖(NT)和横垄(CR)4种不同处理下0~100 cm土壤水分垂直变化和水平变化,测定了大豆产量和水分利用效率。结果表明:1)在大豆不同生育期中,各处理在0~40 cm土壤水分含量均表现为:NT>ZT>CR>CT,当土层深度大于40 cm时,各处理间土壤水分含量的大小关系发生波动变化,其中ZT和NT能明显改善0~50 cm土层土壤水分含量,较CT处理保墒效果提高25.34%~35.57%。2)CT和ZT处理坡位间土壤水分含量的大小关系,受大豆生育期内总降雨量的影响较小,分别表现为:下坡位>中坡位>上坡位和下坡位≈中坡位>上坡位,而NT和CR处理坡位间土壤水分含量的大小关系,会随着大豆生育期内降雨总量的不同而产生微变。3)各处理剖面土壤水分空间分布格局均表现出下湿上干的特点,CT和CR湿润土层(体积含水率≥11.6%)分别位于坡底40~100 cm和坡顶40~100 cm处,而干燥土层(体积含水率≤8.6%)则分别位于坡顶10~30 cm和坡底10~20 cm处。ZT湿润土层(体积含水率≥12%)分布集中性较差,NT湿润土层分布集中性最好,且范围最大,占据了整个坡面40~100cm深度范围。4)所考虑的3个因素对土壤水分含量影响作用的大小表现为:耕作模式>剖面深度>坡位。5)在2a试验中,与CT相比CR、ZT和NT处理产量分别平均增加8.77%、15.68%和26.74%,水分利用效率分别平均提高6.32%、11.6%和20.61%,因此建议在研究区种植大豆时,优先采用NT耕作模式。

       

      Abstract: Due to the differences in farming habits, geographic and climatic environment, there are great discrepancies in the cultivation methods in different rainfed agricultural areas of China. In order to study the effect of different tillage patterns on soil moisture characteristics and crop yields in sloping field of the low hilly areas in northern China. 12 standard experimental plots were set as 12 m ×5 m in the soybean fields with sloping field of 10 degree. The long sides of each plot were perpendicular to the contour lines, and the slopes were facing the same direction. In this paper, we set up four treatments: traditional tillage (CT), no-tillage (ZT), no-tillage straw mulch (NT) and Cross Ridge (CR). The bottom of each plot was equipped with a runoff pool. The vertical and horizontal variations of soil moisture content at 0-100 cm depth under different treatmentsat different growth stages of soybean were monitored. The runoff, yield and water use efficiency of soybean in different slopes were measured. The results showed that: 1) in different growth stages of soybean, the soil moisture content of each treatment in 0-40 cm was NT > ZT > CR > CT. When the soil depth exceeded 40 cm, the relationship among different treatments in soil moisture content fluctuated. Compared with the CT treatment, ZT and NT treatments could obviously increased soil moisture content by 25.34% to 35.57% in 0-50 cm. 2) The relationship between CT and ZT treatments in soil water content was slightly affected by the total rainfall during soybean growth period, which showed as follows: downhill position > midslope position > uphill position, and downhill position ≈ middle slope position > uphill position, and the relationship between NT and CR treatments in soil moisture content slightly varied with the total rainfall during the soybean growth period. 3) The spatial distribution of soil moisture in profile of each treatment showed the characters of upper wetting and down drying. The wet soil layers (volumetric moisture content ≥11.6%) in CT and CR treatment were located at 40-100 cm from the bottom of slope and 40-100 cm from the top of slope, respectively, while dry soil layers (volumetric moisture content ≤ 8.6%) were located at 10-30 cm from the top of slope and 10-20 cm from the bottom of slope, respectively. The wet soil layer (volume moisture content ≥ 12%) in ZT treatment was poorly distributed, and wet soil layer in NT treatment has centralized distribution with the largest range, occupying the 40-100 cm depth range of the whole slope. 4) The effects of three factors on soil water content were as follows: tillage pattern > depth of profile > slope position. 5) During the 2yr's experiment, compared with the CT treatment, soybean yield in CR, ZT and NT treatments increased by 8.77%, 15.68% and 26.74%, respectively, and water use efficiency increased by 6.32%, 11.6% and 20.61%, respectively. Therefore, NT cultivation mode should be preferred in soybean cultivation in the study area.

       

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