Darch Tegan, Giles Courtney D, Blackwell Martin S A, George Timothy S, Brown Lawrie K, Menezes-Blackburn Daniel, Shand Charles A, Stutter Marc I, Lumsdon David G, Mezeli Malika M, Wendler Renate, Zhang Hao, Wearing Catherine, Cooper Patricia, Haygarth Philip M
1Rothamsted Research, North Wyke, Okehampton, Devon EX20 2SB UK.
2The James Hutton Institute, AB15 8QH and Dundee, Aberdeen, Scotland DD2 5DA UK.
Plant Soil. 2018;427(1):125-138. doi: 10.1007/s11104-017-3365-z. Epub 2017 Aug 8.
Intercropping can improve plant yields and soil phosphorus (P) use efficiency. This study compares inter- and intra-species intercropping, and determines whether P uptake and shoot biomass accumulation in intercrops are affected by soil P availability.
Four barley cultivars ( L.) and three legume species ( and ) were selected on the basis of their contrasting root exudation and morphological responses to P deficiency. Monocultures and barley-barley and barley-legume intercrops were grown for 6 weeks in a pot trial at very limiting, slightly limiting and excess available soil P. Above-ground biomass and shoot P were measured.
Barley-legume intercrops had 10-70% greater P accumulation and 0-40% greater biomass than monocultures, with the greatest gains occurring at or below the sub-critical P requirement for barley. No benefit of barley-barley intercropping was observed. The plant combination had no significant effect on biomass and P uptake observed in intercropped treatments.
Barley-legume intercropping shows promise for sustainable production systems, especially at low soil P. Gains in biomass and P uptake come from inter- rather than intra-species intercropping, indicating that plant diversity resulted in decreased competition between plants for P.
间作可提高作物产量和土壤磷利用效率。本研究比较了种间和种内间作，并确定间作作物对磷的吸收和地上部生物量积累是否受土壤磷有效性的影响。
根据四种大麦品种（L.）和三种豆科植物（和）对缺磷的根系分泌物和形态反应的差异进行选择。在土壤有效磷极低、略有不足和过量的盆栽试验中，将单作以及大麦-大麦和大麦-豆科植物间作种植6周。测定地上部生物量和地上部磷含量。
大麦-豆科植物间作的磷积累量比单作高10%-70%，生物量比单作高0%-40%，最大增幅出现在大麦低于亚临界磷需求时。未观察到大麦-大麦间作的益处。作物组合对间作处理中观察到的生物量和磷吸收没有显著影响。
大麦-豆科植物间作对可持续生产系统具有潜力，尤其是在土壤磷含量低的情况下。生物量和磷吸收的增加来自种间而非种内间作，这表明植物多样性降低了植物间对磷的竞争。
