摘要
【目的】以黄土高原半干旱区有限降水持续高效利用为目标,研究不同覆膜方式下连作玉米(Zea May L.)的产量表现和水分利用特征,揭示其增产机理,明确不同覆膜方式下有利于土壤水分持续高效利用的连作年限,为试区高产、水分高效持续利用型玉米连作技术提供理论依据。【方法】以田间定位试验为基础,量化连作玉米农田土壤水分的年际平衡关系、产量稳定性;以持续高产和收获期不发生土壤干燥化为依据,确定适用于不同覆膜方式的玉米连作年限。【结果】3年试验结果表明,全膜双垄沟播具有良好的保墒、提高土壤水分有效性,利于协调关键生育时期土壤-作物的水分供需关系,提高产量和水分利用效率的作用。与半膜平作处理相比,全膜双垄沟播玉米的籽粒产量、水分利用效率分别提高了41.8%和33.4%,生物产量、单位耗水的干物质累积量、总产值、净产值、毫米水产值和产投比分别提高了21.8%、12.3%、31.2%、27.8%、21.1%和-3.2%;与露地栽培处理相比生物产量、单位耗水的干物质累积量、总产值、净产值、毫米水产值和产投比分别提高了24.9%、39.1%、225.5%、1 423.9%、212.4%和93.5%。地膜覆盖增大了玉米全生育时期的耗水量,全膜双垄沟播、全膜平作和半膜平作耗水量较露地栽培增幅分别为15.5%—29.2%、10.0%—20.8%和4.2%—12.6%。单季较高的耗水量导致3种覆盖处理在连作第二年收获期土壤贮水量较连作开始期分别降低了37.3%、33.5%和30.9%,第三年降低了29.6%、27.5%和23.9%,造成土壤水分亏缺;随着连作年限的延长,土壤水分亏缺累计,出现土壤干化现象,引起产量波动,不利于土壤水分的持续利用。【结论】黄土高原半干旱区,在同等降雨条件下,全膜双垄沟播具有明显的增产增效和提高水分利用效率的作用,是理想的玉米种植模式;当年降雨量在320 mm左右时,全膜双垄沟播玉米连作不宜超过2年,全膜平作、半膜平作玉米的连作时间不宜超过3年。
[Objective] The objective of this study is to evaluate the impact of continuous maize cropping under different plastic film mulching modes on the yield, water consumption, and water use efficiency （WUE） of maize, uncover the mechanism of increase production and water use efficiency under different plastic film mulching patterns. It is also to ascertain time limitation for continuous maize cropping for sustainable and efficient water use. [Method] Based on the field experiment, quantization of soil water balance between years and maize yield stability was determined. Maize continuous cropping time limitation was determined by continuous high yield and no appearance of soil desiccation in harvesting period.[Result]Under 3-year continuous cropping conditions, the results showed that completely film mulched alternating narrow and wide ridges with furrow planting had significant effects on increasing maize yield and WUE, and was of benefit to the water demand of maize crop at the key growth and development stage. Compared with half-mulching and flat-planting treatment, maize yield and WUE was increased by 41.8%and 33.4%, respectively. Maize biomass, WUEb, WUEy, total output value, net output value, output per rainfall value and input-output ratio increased by 21.8%, 12.3%, 31.2%, 27.8%, 21.1% and -3.2%, respectively; they increased by 24.9%, 39.1%, 225.5%, 1423.9%, 212.4% and 93.5% compared to flat-planting without mulching treatment, respectively. Film mulching increased the amount of water consumption in the maize whole growth period by 15.5%-29.2%, 10.0%-20.8%and 4.2%-12.6%for completely film mulched alternating narrow and wide ridges with furrow planting, complete mulching and flat-planting, half-mulching and flat-planting treatment compared to flat-planting without mulching treatment. High water consumption in the crop growing period made the soil water storage under three film mulching treatments decreased by 37.3%, 33.5%and 30.9%lower than the beginning of the experiment in the second year, and it was 29.6%, 27.5% and 23.9% lower in the third year, this continuous soil water decrease practice resulted in soil water deficiency. With the prolongation of the time of continuous cultivation, soil desiccation appeared and has a negative effect on soil water sustainable use.[Conclusion]Under the same rainfall conditions, the completely mulched alternating narrow and wide ridges with furrow planting had a significant effect on increasing the yield, benefit and the WUE. Taking the sustainable use of water into account, 2 years is a suitable period of continuous cropping for the completely mulched alternating narrow and wide ridges with furrow planting, and 3 years is a suitable period of continuous cropping for complete mulching and flat-planting, half-mulching and flat-planting, flat-planting without mulching, respectively, in semi-arid region of Loess Plateau.
出处
《中国农业科学》
CAS
CSCD
北大核心
2015年第8期1558-1568,共11页
Scientia Agricultura Sinica
基金
国家"973"计划(2012CB722902)
国家公益性行业(农业)计划(201103001)
甘肃农业大学盛彤笙创新基金(GSAU-STS-1226)
关键词
黄土高原半干旱区
玉米产量
覆膜
连作
承载时限
semi-arid region of Loess Plateau
maize yield
plastic film mulching
continuous cropping
time load limitation
