不同灌水量下玉米的产量可持续性对间作绿肥的响应

doi:10.3724/SP.J.1006.2024.33068

摘要/Abstract

摘要：

明确间作绿肥对不同灌水量下玉米产量可持续性的影响，对构建节水增效型玉米间作豆科绿肥模式具有重要支撑作用。于2018—2022年开展田间定位试验，采用裂区试验设计，设置玉米间作箭筈豌豆(M/V)和单作玉米(SM) 2种种植模式，以及玉米地方习惯灌水量(I₃: 4000 m³ hm^-2)、减量15% (I₂: 3400 m³ hm^-2)、减量30% (I₁: 2800 m³ hm^-2) 3种灌水水平。研究了间作绿肥对不同灌水量下玉米产量及产量构成因素、相对多作物抗性指数、产量可持续性指数、关键土壤养分指标和经济效益的影响。结果表明，间作绿肥可在减量15%灌水条件下较单作玉米提高玉米穗粒数和千粒重，从而提高玉米籽粒产量，2019—2022年，间作玉米在减量15%灌水水平下较单作玉米的穗粒数和千粒重分别提高8.7%~16.4%和7.1%~13.4%，籽粒产量提高9.3%~23.6%，同时与间作玉米地方习惯灌水量处理的籽粒产量无显著差异。间作绿肥使玉米在减量灌水条件下的相对多作物抗性指数均大于0，且随种植年限的增加而提高，进而降低了减灌条件下产量的变异系数、提高了产量可持续性指数，间作玉米产量变异系数较同一灌水量单作玉米降低77.9%~82.8%、产量可持续性指数提高12.2%~19.9%。玉米间作绿肥可以增加土壤养分，与单作玉米相比土壤有机质、速效氮含量分别增加6.4%~15.8%、12.1%~35.6%，土壤速效磷含量在减量15%和减量30%灌水水平下分别增加了19.4%、11.3%，玉米间作绿肥在减量15%灌水水平下的土壤有机质、速效氮和速效磷含量与地方习惯灌水量处理无显著差异，均显著大于其他处理。在2020—2022年，间作玉米在减量15%灌水水平下较单作玉米的纯收益提高了10.5%~34.2%；在2021—2022年产投比提高了7.8%~10.4%，与间作玉米地方习惯灌水量处理无显著差异。间作绿肥主要通过增加土壤有机质，改善土壤氮、磷养分条件而增强玉米产量可持续性。总之，间作绿肥能够缓减因灌水量减少造成的产量损失，增强减量灌水下玉米产量稳定性和可持续性指数。本研究中玉米间作箭筈豌豆灌水量3400 m³ hm^-2，可作为试区玉米可持续生产模式及其适宜灌水量的参考。

关键词: 产量稳定性, 产量可持续性, 间作绿肥, 减量灌水, 玉米

Abstract:

Clarifying the effect of intercropped green manure on the yield sustainability of maize under different irrigation levels plays a crucial role in the development of a water-saving and efficiency-oriented maize and leguminous green manure intercropping system. Field experiments were conducted from 2018 to 2022 using a split-plot experimental design, including two planting patterns: maize and green manure intercropping (M/V) and sole maize cropping (SM). Three irrigation levels were implemented: local conventional irrigation (I₃: 4000 m³ hm^-2), 15% reduction in irrigation (I₂: 3400 m³ hm^-2), and 30% reduction in irrigation (I₁: 2800 m³ hm^-2). The effects of intercropped green manure on maize yield, yield components, relative multi-crop resistance index, yield sustainability index, key soil nutrient indicators, and economic benefits under different irrigation levels were investigated. The results indicated that intercropped green manure increased the number of maize kernels and thousand-kernel weight when subjected to a 15% reduction in irrigation, compared to sole maize cropping, resulting in enhanced grain yield. From 2019 to 2022, intercropped maize with a 15% reduction in irrigation exhibited an increase in the number of maize kernels and thousand-kernel weight by 8.7%–16.4% and 7.1%–13.4%, respectively, compared to sole maize cropping. Grain yield also increased by 9.3%–23.6%. There was no significant difference in grain yield between intercropped maize with a 15% reduction in irrigation and local conventional irrigation. The relative multi-crop resistance index of intercropped maize under reduced irrigation was greater than 0 and increased with the duration of planting, reducing the coefficient of variation in yield and increasing the yield sustainability index of maize. Under the same irrigation levels, the coefficient of variation in yield of intercropped maize decreased by 77.9%–82.8%, and the sustainability index increased by 12.2%–19.9% compared to sole maize cropping. Maize intercropped with green manure also led to increased soil nutrient levels compared to sole maize cropping. Soil organic matter and available nitrogen content increased by 6.4%–15.8% and 12.1%–35.6%, respectively. Soil available phosphorus content in maize and green manure intercropping with a 15% and 30% reduction in irrigation increased by 19.4% and 11.3%, respectively, compared to sole maize cropping. The content of soil organic matter, available nitrogen, and available phosphorus in maize and green manure intercropping with a 15% reduction in irrigation showed no significant difference compared to local conventional irrigation but was significantly greater than other treatments. The net income of intercropped maize with a 15% reduction in irrigation increased by 10.5%–34.2% compared to sole maize cropping from 2020 to 2022. From 2021 to 2022, the investment ratio of intercropped maize with a 15% reduction in irrigation increased by 7.8%–10.4% compared to sole maize cropping and showed no significant difference compared to intercropped maize with local conventional irrigation. Intercropped green manure improved the yield sustainability of maize by increasing soil organic matter and improving soil nitrogen and phosphorus conditions. In summary, intercropped green manure can mitigate the yield loss of maize caused by reduced irrigation, enhance the stability and sustainability index of maize under reduced irrigation. In this investigation, maize and common vetch intercropping with an irrigation level of 3400 m³ hm^-2 can serve as a reference for sustainable maize production and suitable irrigation levels in the experimental region.

Key words: yield stability, sustainability yield, intercropped green manure, reduced irrigation quota, maize

王昀杰, 樊志龙, 张刁亮, 毛守发, 胡发龙, 殷文, 柴强. 不同灌水量下玉米的产量可持续性对间作绿肥的响应[J]. 作物学报, 0, (): 0-.

WANG Yun-Jie, FAN Zhi-Long, ZHANG Diao-Liang, MAO Shou-Fa, HU Fa-Long, YIN Wen, CHAI Qiang. Response of the yield sustainability of maize with different irrigated quota to intercropped green manure[J]. Acta Agronomica Sinica, 0, (): 0-.

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