农牧交错区保护性耕作对土壤含水量和温度的影响
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农业部专项“发展生态农业治理沙漠化土地”项目资助


Effect of Conservation Tillage on Soil Moisture and Temperature in the Farming-Pasture Zone
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    摘要:

    试验比较了保护性耕作与常规翻耕处理土壤的含水量和温度。结果表明,保护性耕作土壤含水量比常规翻耕处理有所增加,整个生长季表现为:秸秆覆盖>留茬>常规翻耕;0-40 cm土层,随着土壤深度的增加含水量逐渐增加,其中留茬处理较常规翻耕处理增加11.8 g/kg,秸秆覆盖较常规翻耕处理增加23.2 g/kg。地温的变化规律表现为玉米大喇叭口期以前保护性耕作各土层地温均低于常规翻耕处理,即常规翻耕>留茬>秸秆覆盖;0-20 cm耕作层内,播种时留茬处理土壤温度比常规翻耕处理低0.5℃,秸秆覆盖处理比常规翻耕处理低6.6℃;出苗时,留茬处理的土壤温度较常规翻耕处理低0.8℃,秸秆覆盖处理较常规翻耕处理低413℃;大喇叭口期以后,各处理地温逐渐降低并趋于一致。保护性耕作土层的含水量增加,有利于作物生长;而早春地温低则不利于出苗,易对作物生长造成不利影响,两者有一定的补偿效果,有必要进一步深入研究以克服其早春地温低回升慢的缺点。

    Abstract:

    An experiment was carried out to compare conservation tillage with the traditional one in soil moisture and temperature.The results of the experiment showed that the former was higher than the latter in soil moisture content.In terms of soil moisture content throughout the whole growth season,the three treatments in the experiment were in the order of Treatment Ⅰ(mulching the field with crop stalks) > Treatment Ⅱ(leaving stubbles in the field) > CK (conventional tillage).In the 0-40 cm soil layer,soil moisture increased gradually with the soil depth.In Treatment Ⅱ it increased by 11.8 g/kg while in Treatment Ⅰ it did by 23.2 g/kg.In terms of soil temperature in various soil layers at the booting stage,the three treatments were in a reverse order,i.e.CK > Treatment Ⅱ > Treatment Ⅰ,Within the 20 cm plowing layer,in the seeding period Treatment Ⅱ was 0.5℃ lower in temperature than CK and Treatment Ⅰ was 6.6℃ lower,while in the period of emergence,Treatment Ⅱ was 0.8℃ lower and Treatment Ⅰ was 4.3℃ lower.However,at the booting storage,the three treatments tended to come close in soil temperature.The higher moisture content in the conservation tillage was beneficial to crop growth,but the lower soil temperature in early spring could bring about negative effect on emergence of seedlings,and hence crop growth.Though there was some compensative effect between them,further study should be done in order to overcome the disadvantage of lower ground temperature in early spring.

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常旭虹,赵广才,孟祥云,杨丽珍,皮福忠,毕玉强,刘秀全.农牧交错区保护性耕作对土壤含水量和温度的影响[J].土壤,2006,38(3):328-332. CHAGN Xu-hong, ZHAO Guang-cai, MENG Xiang-yun, YANG Li-zhen, PI Fu-zhong, BI Yu-qiang, LIU Xiu-quan. Effect of Conservation Tillage on Soil Moisture and Temperature in the Farming-Pasture Zone[J]. Soils,2006,38(3):328-332

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  • 在线发布日期: 2017-05-20
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