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首页> 外文期刊>Crop science >Belowground Interspecies Interaction Enhances Productivity and Water Use Efficiency in Maizea€“Pea Intercropping Systems
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Belowground Interspecies Interaction Enhances Productivity and Water Use Efficiency in Maizea€“Pea Intercropping Systems

机译：地下种间相互作用提高了玉米-豌豆间作系统的生产率和水分利用效率

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Intercropping is shown to have yield advantages compared with sole cropping, but it is unknown how much yield advantage is due to belowground interspecies interactions. Here we determined grain yield, land equivalent ratio (LER), and water use efficiency (WUE) of maize (Zea mays L.)a€“pea (Pisum sativum L.) intercropping and quantified the magnitude of the contribution by belowground interspecies interactions. Field experiments were conducted at Wuwei (37?°96a€2 N, 102?°64a€2 E), northwest China, in 2009 and 2010. Treatments included sole maize, sole pea, and three maizea€“pea intercropping systems that, respectively, had no root-barrier (Ma€“P), plastic sheet barrier (PMa€“P), and nylon mesh barrier (NMa€“P). The plastic sheet and nylon mesh barriers were vertically placed to 1-m deep between the two intercrop strips; this allowed the quantification of belowground interspecies interactions. On a per hectare basis, the maizea€“pea intercropping increased grain yields by an average of 31.3% and improved WUE by 21.9% compared with the corresponding sole maize and sole pea. The LER value was 1.33 for the Ma€“P system, suggesting that the grain yield produced by the maizea€“pea intercrops per hectare is equivalent to the yield that sole crops would produce with 33% additional farmland. The Ma€“P system had the yield of 11,034 kg haa?’1, which was 21.9% greater compared with the PMa€“P system and 9.7% greater compared with the NMa€“P system. The comparison of the three intercropping systems revealed that belowground interspecies interactions contributed 59.3% of the increased yields and 88.9% of the improved WUE. Of the increased yield, about 40% was due to water movement between the two strips and the remaining 19% was due to root overlapping activity. We conclude that sharing resources in the rooting zones between the intercrops serve as a major mechanism responsible for the large yield and WUE advantages for the maizea€“pea intercropping in arid areas.
机译：与单独种植相比，间作显示出具有增产优势，但未知地下种间相互作用带来了多少增产优势。在这里，我们确定了玉米（Zea mays L.）和豌豆（Pisum sativum L.）间作的谷物产量，土地当量比（LER）和水分利用效率（WUE），并通过地下物种间相互作用定量了其贡献量。 。 2009年和2010年在中国西北的无为（37°？96a？2 N，102°？64a？2E）进行了田间试验。处理方法包括单一玉米，单一豌豆和三种玉米，豌豆间作系统，分别没有根屏障（Ma€“ P），塑料薄板屏障（PMa” P）和尼龙网状屏障（NMa€“ P）。将塑料片和尼龙网状屏障垂直放置在两个间作带之间的1-m深处。这样就可以量化地下种间的相互作用。与相应的唯一玉米和唯一豌豆相比，玉米/豌豆间作在每公顷土地上平均提高了谷物产量，平均增幅为31.3％，WUE提高了21.9％。对于Ma-P系统，LER值为1.33，这表明每公顷玉米/豌豆间作所产生的谷物产量与仅增加33％耕地的唯一农作物的产量相等。 Ma-P系统的产量为11,034 kg haa-1，比PMa-P系统高21.9％，比NMa-P系统高9.7％。三种间作系统的比较表明，地下种间相互作用对增产的贡献为59.3％，对水分利用效率的提高为88.9％。在增加的产量中，约40％是由于两个条带之间的水分运动，其余19％是由于根系重叠活性。我们得出的结论是，在间作作物之间生根区共享资源是造成干旱地区玉米-豌豆间作的高产量和WUE优势的主要机制。

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