周年覆盖对黄土旱塬冬小麦产量及降水利用率的影响
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S152.7;S512.1

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Effects of Annual Mulching on Yield and Precipitation Use Efficiency of Winter Wheat in the Dry Highland of Loess Plateau
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    摘要:

    针对黄土旱塬麦田降水资源少,降水季节与冬小麦需求错位,小麦产量低而不稳的问题,为探究适合当地旱作冬小麦高产高效的栽培措施,通过4年大田试验,研究了无覆盖条播(USL)、垄膜沟播(RFSF)和全膜覆土穴播(WFFHS)种植方式下,冬小麦夏休闲期残膜覆盖的蓄水保墒效果以及周年覆盖条件下冬小麦的产量效应和降水生产效率情况。结果表明:夏休闲期残膜覆盖可以提高土壤蓄水保墒能力,垄膜沟播和全膜覆土穴播处理2 m土壤休闲蓄水量分别较露地条播处理高12%~22%(P<0.05)和14%~30%(P<0.05),相应休闲效率在29%~42%,亦显著高于无覆盖条播处理,且差异性随夏休闲期降水量增加而增加。全膜覆土穴播周年覆盖具有显著的增产效应,较传统无覆盖条播平均增产40%,覆膜种植促进了冬小麦千粒重和穗数的增加,籽粒产量与穗数成极显著正相关(r=0.830**),覆膜和合理构建群体是提高旱塬冬小麦产量的重要措施。不同处理间水分生产效率、休闲期降水生产效率和周年降水生产效率以全膜覆土穴播处理最高,平均值分别为19.3,9.3,11.7 kg/(hm2·mm)。黄土旱塬冬小麦生育期耗水深度达2 m以下,覆膜种植处理的耗水量高于无覆盖条播处理,且覆膜加大对1 m以下深层土壤水分的消耗。从作物高产和降水高效利用角度考虑,全膜覆土穴播周年覆盖是黄土旱塬冬小麦一种有效的栽培模式。

    Abstract:

    In order to solve the problems of low precipitation, inconsistency of rain season and water demand period for winter wheat, low and unstable yield in the dry highland of Loess Plateau, a 4-years field experiment was conducted to optimize the cultivation pattern of highyield and high efficiency in winter wheat production. In this study, the effects of residual plastic film mulching on rainfall reserving and soil moisture conservation in summer fallow period, and the effects of annual film mulching on yield and precipitation use efficiency of winter wheat were studied under three planting patterns, including uncovered and sowing in line (USL), ridge filming and sowing in furrow (RFSF) and whole field filming and hole sowing (WFFHS). The results showed that residual plastic film mulching in summer fallow period enhanced the capacity of rainfall reserving and soil moisture conservation. The water?storage?content in 2m depth of soil during fallow period were 12% ~ 22%(P<0.05)and 14% ~ 30%(P <0.05)greater in RFSF and WFFHS treatments than that in USL treatment, respectively, and the fallow efficiencies in these two treatments ranged from 29% to 42%, which were significant greater than that in USL treatment, meanwhile, the difference increased with the increasing of precipitation in summer fallow period. Compared with the USL treatment, the average yield in WFFHS treatment increased by 40%. Plastic film mulching improved the thousand-kernel weight and spike?number per?hectare of winter wheat, and there existed a?significant positive?correlation between grain yield and spike?number?per?hectare (r=0.830**), so plastic film mulching and reasonable population constructing were considered as the important measures to increase the yield of winter wheat in dry highland of Loess Plateau. The water production efficiency, precipitation production efficiency in fallow period and annual precipitation production efficiency of WFFHS treatment were the highest among all the treatments, which were 19.3, 9.3 and 11.7 kg/(hm2·mm), respectively. The water consumption depth was more than 2 m during growth period of winter wheat, the water consumption under film mulching condition was greater than that of USL treatment, and furthermore, film mulching promoted the water consumption in soil layer deeper than?1 m. In a comprehensive consideration of grain yield and precipitation use efficiency, the whole field filming and hole sowing pattern combined with annual film mulching was the recommendable cultivation mode for winter wheat in the dry highland of Loess Plateau.

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李廷亮, 谢英荷, 高志强,洪坚平, 马红梅, 贾俊香, 孟会生, 孟丽霞.周年覆盖对黄土旱塬冬小麦产量及降水利用率的影响[J].水土保持学报,2018,32(1):332~338

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  • 在线发布日期: 2018-02-27
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