Irrigation alters biogeochemical processes to increase both inorganic and organic carbon in arid-calcic cropland soils
Irrigation alters biogeochemical processes to increase both inorganic and organic carbon in arid-calcic cropland soils
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DOI：
10.1016/j.soilbio.2023.109189
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发表时间：
2023-10-20
影响因子：
9.7
通讯作者：
Blankinship，J. C.
中科院分区：
文献类型：
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作者：
Ball，K. R.;Malik，A. A.;Blankinship，J. C.
干旱农田的灌溉对于维持作物生长是必要的，但随着干旱地区水资源日益短缺和人口增长，灌溉系统可能需要从漫灌转向滴灌技术，以科普日益增加的水需求。因此，重要的是要了解如何灌溉驱动有机和无机碳动态干旱石灰性土壤。以干旱-石灰性农田土壤为研究对象，探讨了淹水和地下滴灌对土壤有机碳（SOC）和无机碳（SIC）形成的影响，以及土壤化学性质和细菌、真菌生物量对土壤有机碳和无机碳形成的影响。以及，这些动态进行了评估，在未管理/未灌溉的沙漠土壤。滴灌条件下土壤有机碳含量显著高于漫灌条件，但漫灌条件下土壤有机碳含量高于滴灌和不灌溉条件下。观察到的SOC-SIC模式可能是由钙结合驱动的。洪水灌溉增加了显着更多的钙和碳酸氢盐的系统，同时浸出溶解有机碳（DOC）。在洪水下，钙可能更优先地结合为碳酸钙。在滴灌条件下，灌水量减少，根系区钙和SOC保持不变，SOC可能通过离子桥稳定。尽管更高的有机碳下滴灌，更多的总生物量，细菌生物量下检测到洪水比滴灌，这促进了真菌生物量。洪水灌溉下的细菌生物量可能有助于微生物碳酸盐沉淀，支持的常见细菌群体已知有助于这一过程的存在，并与钙显着的正相关关系。本研究强调了从非生物和生物，特别是微生物的角度研究SOC和SIC动态的重要性，以优化干旱农田土壤碳储量。
Irrigation in arid croplands is necessary to sustain crop growth, but with increasing water scarcity and population growth in drylands, irrigation systems may need to shift from flooding to dripping techniques to cope with increased water demand. Therefore, it is important to understand how irrigation drives organic and inorganic carbon dynamics in arid-calcic soils. This study on arid-calcic cropland soils assessed the influence of flood and subsurface drip irrigation on soil organic carbon (SOC) and soil inorganic carbon (SIC) formation as influenced by soil chemical properties and bacterial and fungal biomass. As well, these dynamics were assessed in an unmanaged/unirrigated desert soil. Under drip irrigation, SOC was significantly greater than under flood irrigation, but flood stored more SIC than drip irrigation and no irrigation. The observed SOC–SIC patterns were likely driven by calcium binding. Flood irrigation adds significantly more calcium and bicarbonate to the system, while leaching dissolved organic carbon (DOC). Under flood, calcium is likely more preferentially bound as calcium carbonate. Under drip irrigation, less water was added, calcium and SOC were maintained in the rooting zone where SOC may be stabilizedviacation-mediated bridging. Despite higher SOC under drip, more total, and bacterial biomass were detected under flood than drip irrigation, which promoted fungal biomass. Bacterial biomass under flood irrigation may be contributing to microbial carbonate precipitation, supported by the greater presence of common bacterial groups known to contribute to this process, and significant positive relationships with calcium. This research emphasizes the importance of examining SOC and SIC dynamics from abiotic and biotic and particularly microbial perspectives; to optimize soil carbon storage in arid croplands.