Key Laboratory of Mariculture (Ministry of Education), Fisheries College, Ocean University of China, Qingdao, 266001, P. R. China.
Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, P. R. China.
J Environ Manage. 2024 Sep;368:122134. doi: 10.1016/j.jenvman.2024.122134. Epub 2024 Aug 15.
At present, it is estimated that approximately 800 million hectares of arable land worldwide is saline-alkali soil, which has become one of the major limiting factors restricting global agricultural productivity. Meanwhile, the residual food and excreta of mariculture animals, accompanied by potential eutrophication pollution, remain an unresolved issue due to salinity. In this study, the ameliorative effects of biochar (BC700) prepared from maricultural-solid-waste on the biological properties and physicochemical of saline-alkali soil and Salicornia europaea L growth were investigated. Supplements of 1, 3 and 5% BC700 significantly increased the total nitrogen, available phosphorus, available potassium and organic carbon in soil by 2.00-68.30%, 26.74-64.96%, 7.74-52.53% and 3.43-64.96%, respectively. And BC700 significantly reduced soil pH. This occurred with enhanced soil urease, sucrase and alkaline phosphatase activities and alterations to the bacterial community structure, thus improving P and N cycling and the soil physicochemical properties. In addition, BC700 has weakened the competition between saline soil microorganisms and also changed the key species of microbial networks. Co-utilization of BC700 and S. europaea cultivation could increase the stability of the soil microbial community while the growth of the plant was significantly promoted by 19.8-25.4%. Supplements of 3% BC700 are recommended as an eco-friendly and effective treatment for the recycling of mariculture wastes for the improvement of saline-alkali soils.
目前，据估计全世界有 8 亿公顷耕地是盐碱地，这已成为限制全球农业生产力的主要因素之一。同时，由于盐分的存在，水产养殖动物的残余食物和排泄物仍然是一个未解决的潜在富营养化污染问题。在本研究中，研究了由水产养殖固体废物制备的生物炭（BC700）对盐碱地和盐角草（Salicornia europaea L.）生长的生物学特性和理化性质的改良作用。1%、3%和 5%的 BC700 补充剂分别显著提高了土壤中总氮、有效磷、速效钾和有机碳含量 2.00-68.30%、26.74-64.96%、7.74-52.53%和 3.43-64.96%，同时降低了土壤 pH 值。这是由于土壤脲酶、蔗糖酶和碱性磷酸酶活性的增强以及细菌群落结构的改变，从而改善了 P 和 N 循环以及土壤理化性质。此外，BC700 削弱了盐碱土壤微生物之间的竞争，改变了微生物网络的关键物种。BC700 和盐角草共培养的使用可以增加土壤微生物群落的稳定性，同时植物的生长也显著提高了 19.8-25.4%。建议使用 3%的 BC700 作为一种环保且有效的处理方法，用于回收水产养殖废物，以改善盐碱地。
