Marine Agriculture Research Center, Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
Marine Agriculture Research Center, Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
Sci Total Environ. 2021 Jun 25;775:144893. doi: 10.1016/j.scitotenv.2020.144893. Epub 2021 Feb 4.
Coastal soil is an important land reserve that may be used to alleviate the shortage of cultivated land; however, this soil is stressed by saline conditions and nutrient deficiency. Biochar offers the potential to reclaim coastal soil, but the response of plant growth to biochar addition in salt-affected soil is species-dependent. In this study, the response of ice plant (Mesembryanthemum crystallinum L.), an economically valuable halophyte that grows in the coastal soil of the Yellow River Delta, to wood chip biochar (WBC) either alone or in combination with chemical fertilizer was investigated using a 90-day pot experiment. The WBC enhanced the growth of ice plants in the coastal soil, but combining it with chemical fertilizer did not increase its effect. The nutritional quality of the plants was improved by the addition of WBC, regardless of whether chemical fertilizer was applied; moreover, WBC amendment enhanced photosynthesis and reduced the oxidative stress of the plants. The ameliorated soil properties (e.g., soil organic matter and water holding capacity) and increased contents of available macronutrients (e.g., P and K) and micronutrients (e.g., Mg, Mn, B and Zn) resulting from soil amendment with WBC may have contributed to the enhanced growth and quality of the ice plants. Additionally, in soil modified with WBC, an increased abundance of beneficial taxa (e.g., Erythrobacter, Sphingomonas and Lysobacter) and a shift in the microbial community may also have helped to improve the growth and quality of the ice plants. The results of our study provide useful information for developing a biochar-based technology to use in combination with valuable halophytes to reclaim degraded coastal soil and enhance food security.
滨海土壤是一种重要的土地储备资源，可用于缓解耕地短缺问题；然而，这种土壤受到盐分和养分缺乏的压力。生物炭具有改良滨海土壤的潜力，但植物生长对盐渍土壤中生物炭添加的响应取决于物种。在这项研究中，采用为期 90 天的盆栽试验，研究了生长在黄河三角洲滨海土壤中的经济价值较高的盐生植物冰叶日中花（Mesembryanthemum crystallinum L.）对木片生物炭（WBC）单独或与化肥结合的响应。WBC 促进了滨海土壤中冰叶日中花的生长，但与化肥结合使用并没有增加其效果。添加 WBC 提高了植物的营养品质，无论是否施加化肥；此外，WBC 改良剂增强了光合作用，降低了植物的氧化应激。土壤改良后，土壤有机质和持水能力等土壤性质得到改善，有效大量营养元素（如 P 和 K）和微量营养元素（如 Mg、Mn、B 和 Zn）的含量增加，这可能促进了冰叶日中花的生长和品质提高。此外，在添加 WBC 的土壤中，有益类群（如 Erythrobacter、Sphingomonas 和 Lysobacter）的丰度增加和微生物群落的变化也可能有助于提高冰叶日中花的生长和品质。本研究结果为开发基于生物炭的技术提供了有用信息，该技术可与有价值的盐生植物结合使用，以改良退化的滨海土壤并提高粮食安全。
