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首页> 外文期刊>Soil Science and Plant Nutrition >Cluster root allocation of white lupin (Lupinus albus L.) in soil with heterogeneous phosphorus and water distribution
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Cluster root allocation of white lupin (Lupinus albus L.) in soil with heterogeneous phosphorus and water distribution

机译：磷和水分布不均的土壤中白羽扇豆（Lupinus albus L.）的簇状根分配

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摘要

Cluster roots are structures formed by many plants adapted to phosphorus (P)-deficient soils. We investigated the combined influence of spatial heterogeneity in soil water and P distribution on the allocation of cluster root formation in white lupin (Lupinus albus L.). In this study, single plants were grown at a low or a high rate of water supply in containers filled with a P-poor sand to which either no P was added or which was fertilized homogeneously or heterogeneously. Furthermore, heterogeneous soil water distribution was established in half of the containers by using a finer instead of a coarser sand in a lateral third of the containers. Plant growth increased with water supply rate, but P fertilization had no influence on shoot biomass production. Although overall cluster root production decreased with increasing homogeneous P supply, localized P fertilization had no effect on cluster root allocation. However, cluster roots were preferentially allocated in the soil sections with lower water availability when overall water supply rate was low. The results suggest that overall cluster root production was a systemic response to initial plant P status, while cluster root growth was stimulated locally in drier patches when overall water supply was limiting plant growth.
机译：簇状根是由许多植物组成的结构，这些植物适合缺磷（P）的土壤。我们调查了土壤水分和磷分布的空间异质性对白羽扇豆（Lupinus albus L.）的簇根形成分配的综合影响。在这项研究中，单株植物在装满低磷的沙子的容器中以低速或高供水速率生长，不向其中添加磷，或均匀或异种施肥。此外，通过在容器的侧面三分之一中使用较细而不是较粗的沙子，在一半的容器中建立了非均质的土壤水分分布。植株生长随供水速率的增加而增加，但磷肥对枝条生物量的生产没有影响。尽管总体簇根产量随着同质磷供应的增加而降低，但局部施肥对簇根分配没有影响。但是，当总体供水率较低时，簇根优先分配在水分利用率较低的土壤区域。结果表明，总体簇生根的产生是对植物初始磷状态的系统响应，而当总体供水限制植物生长时，在较干燥的斑块中局部刺激簇生根的生长。

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