期刊
PLANT AND SOIL
卷 395, 期 1-2, 页码 105-123出版社
SPRINGER
DOI: 10.1007/s11104-014-2246-y
关键词
Biochar; Iron phosphate; Microbial biomass; Mycorrhizas; Phaseolus vulgaris; Phosphorus fixation; NLFA; Rhizosphere
资金
- NSF-Basic Research for Enabling Agricultural Development program (BREAD) [IOS-0965336]
- Fondation des Fondateurs
- NSF MRSEC program [DMR-1120296]
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [0965336] Funding Source: National Science Foundation
We sought to understand biochar's role in promoting plant phosphorus (P) access via arbuscular mycorrhizas (AM), focusing on whether P solubility and biochar-P proximity altered AM enhancement of P uptake in a mycorrhizal crop legume. A greenhouse study compared feedstock-derived P with 50 mg P pot(-1) of sparingly soluble FePO4 (Fe-P) or soluble NaH2PO4 (Na-P) at different proximities to biochar (co-pyrolyzed, mixed with biochar, mixed with soil) on Phaseolus vulgaris P uptake, specific root length (SRL), AM colonization, AM neutral lipids, and microbial biomass-P. Biochar increased AM colonization by 6 % (p < 0.01) and increased Fe-P uptake from 3.1 to 3.8 mg plant(-1), with AM-related Fe-P uptake increased by 12 % (p < 0.05). Regardless of proximity, biochar applied with Fe-P was enriched (> 2x) with AM hyphae. Biochar-P proximity did not alter P uptake, but shifted uptake towards AM for Fe-P and roots for Na-P. Soluble P located on biochar increased total plant + microbial P (p < 0.05). Biochar reversed (p < 0.05) reductions in SRL induced by AM. Biochar enhanced AM's access to sparingly soluble P, and root/microbial access to soluble P. Biochar augments sparingly soluble P uptake at scales larger than biochar particles, perhaps by reducing P sorption or facilitating root/hyphal exploration.
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