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首页> 外文期刊>Soil Biology & Biochemistry >Contrasted effect of biochar and earthworms on rice growth and resource allocation in different soils
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Contrasted effect of biochar and earthworms on rice growth and resource allocation in different soils

机译：生物炭和earth对水稻在不同土壤中生长和资源分配的对比作用

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Adding biochar to soils and maintaining high earthworm biomasses are potential ways to increase the fertility of tropical soils and the sustainability of crop production in the spirit of agroecology and ecological engineering. However, a thorough functional assessment of biochar effect on plant growth and resource allocations is so far missing. Moreover, earthworms and biochar increase mineral nutrient availability through an increase in mineralization and nutrient retention respectively and are likely to interact through various other mechanisms. They could thus increase plant growth synergistically. This hypothesis was tested for rice in a greenhouse experiment. Besides, the relative effects of biochar and earthworms were compared in three different soil treatments (a nutrient rich soil, a nutrient poor soil, a nutrient poor soil supplemented with fertilization). Biochar and earthworm effects on rice growth and resource allocation highly depended on soil type and were generally additive (no synergy). In the rich soil, there were both clear positive biochar and earthworm effects, while there were generally only positive earthworm effects in the poor soil, and neither earthworm nor biochar effect in the poor soil with fertilization. The analysis of earthworm and biochar effects on different plant traits and soil mineral nitrogen content, confirmed that they act through an increase in nutrient availability. However it also suggested that another mechanism, such as the release in the soil of molecules recognized as phytohormones by plants, is also involved in earthworm action. This mechanism could for example help explaining how earthworms increase rice resource allocation to roots and influence the allocation to grains.
机译：本着农业生态和生态工程的精神，向土壤中添加生物炭并保持high生物量高是提高热带土壤肥力和作物生产可持续性的潜在途径。但是，到目前为止，还没有对生物炭对植物生长和资源分配的影响进行全面的功能评估。此外，earth和生物炭分别通过增加矿化作用和养分保留来增加矿物质的养分利用率，并可能通过其他各种机制相互作用。因此，它们可以协同增加植物的生长。在温室实验中针对稻米检验了该假设。此外，在三种不同的土壤处理方法（富营养土壤，贫营养土壤，贫营养土壤和肥料）中比较了生物炭和earth的相对作用。生物炭和earth对水稻生长和资源分配的影响在很大程度上取决于土壤类型，并且通常是累加的（无协同作用）。在肥沃的土壤中，生物炭和earth均具有明显的正效​​应，而在肥沃的土壤中通常仅具有positive效应，而在肥沃的土壤中既无neither也无生物炭效应。 worm和生物炭对不同植物性状和土壤矿质氮含量的影响分析表明，它们通过增加养分的利用率发挥作用。但是，这也暗示了另一种机制，例如植物在土壤中释放被植物激素识别的分子，也与worm的作用有关。例如，这种机制可以帮助解释worm如何增加水稻对根的资源分配并影响对谷物的分配。

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