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首页> 外文期刊>Weed Science: Journal of the Weed Science Society of America >Relative importance of shoot and root competition in dry-seeded rice growing with junglerice (Echinochloa colona) and ludwigia (Ludwigia hyssopifolia).
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Relative importance of shoot and root competition in dry-seeded rice growing with junglerice (Echinochloa colona) and ludwigia (Ludwigia hyssopifolia).

机译：种植有丛林（ Echinochloa colona ）和路德维希（ Ludwigia hyssopifolia ）的干种水稻的芽和根竞争的相对重要性。

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摘要

Two separate studies were conducted to determine the relative importance of root and shoot competition in dry direct-seeded rice growing with junglerice and ludwigia. By growing rice in pots placed within larger pots such that the roots of the plants were either separated from or free to mingle with those of neighboring weeds, or by growing rice in the same pots but in the absence of weeds, the relative importance of shoot and root competition can be described. When rice was grown together with either weed species, shoot competition reduced the growth and yield of rice more than root competition. Results suggest that shoot competition for light may be the primary mechanism determining competitive outcomes between dry direct-seeded rice and junglerice or ludwigia. Junglerice was more competitive than ludwigia, which may reflect the C4 metabolism efficiency of junglerice compared to the C3 metabolism of ludwigia. Rice grain yield was highly correlated with above- and belowground biomass. The results also suggest the importance of measuring the whole plant when seeking to understand differences in the competitive ability of dry direct-seeded rice.
机译：进行了两项单独的研究，以确定在具有丛林和路德维希（Ludwigia）的干直播水稻中，根与芽竞争的相对重要性。通过在放置在较大花盆中的花盆中种植水稻，使植物的根与相邻杂草的根分开或自由混合，或在同一花盆中但没有杂草的情况下种植水稻，则芽的相对重要性和根本竞争可以被描述。当水稻与任何一种杂草种一起生长时，芽竞争比根竞争减少了水稻的生长和产量。结果表明，对光的竞争可能是决定干直播水稻与丛林或路德维希之间竞争结果的主要机制。丛林动物比路德维希岛更具竞争力，这可能反映了丛林动物的C 4 代谢效率与路德维希岛的C 3 代谢相比。稻米产量与地上和地下生物量高度相关。这些结果还表明，在试图了解干式直播水稻的竞争能力差异时，测量整个植物的重要性。

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