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本研究阐述了在免耕条件下,采用保留所有残茬(NT+R)、收割时部分清茬(NT-RH)、种植时部分清茬(NT-RP)及传统耕法(CT)等措施对限额灌溉连作冬小麦的地块土壤贮水量、耗水量及冬小麦产量的影响。试验期间内的土壤贮水量以NT+R和NT-RH较大,CT较小,但水的损失量不受措施的影响。小麦产量为NT+R>CT>NT-RH,而麦草量不受措施影响。限额灌溉连作冬小麦,NT-RH和NT-RP的残茬量为2.2t/hm~2;NT+R残茬量最初有9.0t/hm~2,大部分残茬保存至下季。各种措施下残茬提供的地表覆盖(最小约为70%)都远远超出了易蚀地侵蚀控制所要求的30%。因此,大平原南部易蚀地可以采用限额灌溉和免耕来达到水土保持规划的要求。
In this study, NT-R, NT-RH at harvest, NT-RP and traditional tillage (CT), etc. were studied under no-tillage conditions Effects of Measures on Soil Water Storage, Water Consumption and Winter Wheat Yield of Continuous Cropping with Winter Wheat in. Soil water storage during the test period was larger for NT + R and NT-RH and for CT, but water loss was unaffected by the measure. Wheat yield was NT + R> CT> NT-RH, while the amount of wheatgrass was unaffected by the measure. The total amount of stubble for NT-R and NT-RP was 2.2t / hm ~ 2. The initial amount of NT + R stubble was 9.0t / hm ~ 2, and most of the stubble was preserved till the next season. The surface coverage provided by stubble (minimum about 70%) under various measures far exceeds the 30% required for erosion control. Therefore, limit irrigation and no-tillage can be used to achieve the requirements of water and soil conservation planning in the easily eroded southern Great Plains.