Plant neighbor effects mediated by rhizosphere factors along a simulated aridity gradient
Plant neighbor effects mediated by rhizosphere factors along a simulated aridity gradient
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沿模拟干旱梯度根际因素介导的植物邻居效应
DOI：
10.1007/s11104-012-1565-0
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发表时间：
2013-08
期刊：
影响因子：
4.9
通讯作者：
Chen X
中科院分区：
文献类型：
--
作者：
Yang HS;Yu ZX;Zhang Q;Tang JJ;Chen X
AimsWe调查了根际因子（总根际，根，丛枝菌根真菌菌丝[AMF]，和土壤溶液）和水的有效性如何影响相邻Medicago sativa plants.MethodsA三室mesocosm被用来测试根际因子对植物-植物相互作用的影响。通过计算相对互作指数（RII）来判断相邻植物对目标植物的影响是正的还是负的（促进的还是竞争的）。利用同位素示踪技术研究了AMF菌丝是否介导了目标植物与相邻植物之间的氮素竞争。大蒜植物依赖于水的供应。总根际效应使RII由负向正转变，随着水分有效性的增加。与相邻植物的根和根际土壤溶液的相互作用将RII从负变为正，随着水分供应的增加，但AMF菌丝则相反。AMF菌丝在水分充足时帮助相邻植物竞争15 N，而在水分有限时则不起作用。随着水供应量的增加，竞争性转变为促进性。邻近的土壤溶液和根系的竞争减少，但AMF菌丝增加。
AimsWe investigated how rhizosphere factors (total rhizosphere, roots, arbuscular mycorrhizal fungal hyphae [AMF], and soil solution) and water availability affect interactions between neighboringMedicago sativaplants.MethodsA three-compartment mesocosm was used to test the effects of rhizosphere factors on plant–plant interactions. A relative interaction index (RII) was calculated to indicate whether effects of neighbor plant on target plant were positive or negative (facilitative or competitive). Isotope tracers were used to test whether AMF hyphae mediated competition for nitrogen (N) between target and neighbor plants.ResultsThe effects of rhizosphere factors on the interactions between neighboringM. sativaplants depended on water availability. The effects of total rhizosphere shifted RII from negative to positive as water availability increased. Interaction with the roots and rhizosphere soil solution of neighbor plants shifted RII from negative to positive as water availability increased but the opposite was true for AMF hyphae. AMF hyphae helped neighbor plants compete for15N when water was available but not when water was limiting.ConclusionsThe effect of total rhizosphere on plant–plant interaction ofM. sativashifted from competitive to facilitative as water availability increased. Competition was reduced by neighboring soil solution and roots but was increased by AMF hyphae.
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影响因子：
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