Intercropping promotes the ability of durum wheat and chickpea to increase rhizosphere phosphorus availability in a low P soil
Intercropping promotes the ability of durum wheat and chickpea to increase rhizosphere phosphorus availability in a low P soil
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DOI：
10.1016/j.soilbio.2011.11.015
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发表时间：
2012-03-01
影响因子：
9.7
通讯作者：
Hinsinger, Philippe
中科院分区：
文献类型：
--
作者：
Betencourt, Elodie;Duputel, Marek;Hinsinger, Philippe
粮豆间作可通过增加作物对磷的吸收来促进作物的生长，特别是在低磷土壤中。本研究的目的是测试的假设，这些积极的相互作用是支持根际过程，增加磷的可用性，如根诱导的pH值的变化。在中性和碱性土壤中，豆科植物通过固氮作用使根际土壤酸化，从而增加无机磷的有效性，有利于间作作物的生长。因此，生长，磷吸收，无机磷的有效性和pH值的变化在间作物种的根际硬粒小麦和鹰嘴豆单独种植或间作的温室盆栽试验进行了研究。我们使用的中性土壤从磷肥长期田间试验表现出低（-P）或高（+P）P的可用性。磷的有效性增加，在两个物种的根际，特别是当间作-P。这种增加与碱化。不过，稻田土壤pH值的变化不能完全解释所观察到的磷有效性的变化。低速率的N-2固定可以解释为什么没有观察到根际酸化。增加磷的有效性并没有导致增强磷的吸收，但生长促进硬粒小麦间作鹰嘴豆在磷土壤中观察。我们的假设增加无机磷的有效性在间作作为根诱导酸化的豆科植物的结果没有得到验证，我们建议，根诱导的碱化，而不是参与，以及其他根诱导的过程。因此，通过根际碱化的谷物也可以提高间作豆科作物对磷的吸收和生长。因此，便利化可以以两种方式发生。(C)2011爱思唯尔有限公司保留所有权利。
Cereal-legume intercropping can promote plant growth (i.e. facilitation) through an increase in the amount of phosphorus (P) taken up, especially in low P soils. The aim of this study was to test the hypothesis that these positive interactions are supported by rhizosphere processes that increase P availability, such as root-induced pH changes. In neutral and alkaline soils legumes are assumed to increase inorganic P availability by rhizosphere acidification due to N-2 fixation which benefit to the intercropped cereal. Growth, P uptake, changes in inorganic P availability and pH in the rhizosphere of intercropped species were thus investigated in a greenhouse pot experiment with durum wheat and chickpea either grown alone or intercropped. We used a neutral soil from a P fertilizer long-term field trial exhibiting either low (-P) or high (+P) P availability. Phosphorus availability was increased in the rhizosphere of both species, especially when intercropped in -P. Such increase was associated with alkalization. Rhizosphere pH changes could not fully explain the observed changes of P availability though. Low rates of N-2 fixation may explain why no rhizosphere acidification was observed. Increases in P availability did not lead to enhanced P uptake but growth promotion was observed for durum wheat intercropped with chickpea in P soil. Our hypothesis of an increase in inorganic P availability in intercropping as a consequence of root-induced acidification by the legume was not validated, and we suggested that root-induced alkalization was involved instead, as well as other root-induced processes. Thus, the cereal through rhizosphere alkalization may also enhance P uptake and growth of the intercropped legume. Facilitation can thus occur in both ways. (C) 2011 Elsevier Ltd. All rights reserved.