Effects of biochar on nutrients and the microbial community structure of tobacco-planting soils

Abstract

The effect of rice straw biochar on soil nutrients was studied using a randomized block experimental design in a tobacco-planting field, and differences in soil bacterial and fungal community structures were studied using high-throughput sequencing technology. The results indicated that the soil pH, CEC, total organic carbon (TOC), inorganic carbon (IC), soil total nitrogen (total N), total potassium (total K), available phosphorus (available P), and available potassium (available K) contents were all increased with the biochar application. TOC and available P contents increased by 38.19% and 22.38%, respectively, in the T2 treatment (4500 kg . ha -1 biochar) compared to those in control (CK). But the soil dissolved organic carbon ( DOC) and available nitrogen (available N) content decreased by 13.07% and 9.89% in T2 treatments compared to the CK, respectively. Soil bacteria composition mainly consisted of Proteobacteria, Actinobacteria, and Acidobacteria, and the Proteobacteria proportion represented >50% of the bacterial community. The Actinobacteria proportion decreased, but Proteobacteria and Acidobacteria proportions increased with increasing biochar amounts. Fungi in tobaccoplanting soils were mainly Ascomycota (>75%), but this proportion decreased as the biochar amount increased.However, Zygomycota and Basidiomycota proportions increased with increasing biochar amounts. Therefore, biochar application could improve the soil nutrient status and affect microbial community structure. Rice straw biochar application promoted fungal community diversity in tobacco-planting soils.

Response in Physicochemical Properties of Tobacco-Growing Soils and N/P/K Accumulation in Tobacco Plant to Tobacco Straw Biochar

“…Tobacco (Nicotiana tabacum), one of the most important economic crops in China, is cultivated approximately 1.41 million ha every year, and then, 2.73 million tons of tobacco leaf is yielded (Fan 2013). But the quantity and quality of tobacco leaf were both decreased during the past years due to soil degradation which resulted from the oversupply of mineral fertilizer and long-term continuous tobacco cropping (Gao et al 2017;Zhang et al 2016a). Soil acidification and the decline of soil acid-buffering capacity were also very common in TG soil after long-term tobacco plantation (Zhang et al 2016b).…”

Research on biocharviaa comprehensive scientometric approach

“…46,47 Biochar had some good characteristics, including being rich in nutrients, improving the nutrient utilization efficiency of crops, adjusting soil pH and removal of soil pollutants, etc. [48][49][50][51][52] Due to these characteristics, biochar could improve the soil quality, thus the research concerning biochar and soil(s) were relatively hotter. The further analysis of these 2062 articles containing soil or soils revealed that "carbon" and "effects" were the rst and second most used words, aer soil(s) and biochar.…”

Изменения Таксономического Состава И Структуры Прокариотного Сообщества Агродерново-Подзолистой Почвы При Внесении Биоугля

“…В настоящее время для разных почв не выявлено единой закономерности воздействия биоугля на обилие бактериальных фил. Например, отмеченное нами в исследуемой почве снижение обилия филы Actinobacteria в результате внесения биоугля согласуется с данными других авторов (16). В то же время в некоторых работах описано возрастание обилия этой филы при внесении указанного мелиоранта (14).…”

“…Однако механизмы, обусловливающие такие эффекты, не до конца понятны. Описаны изменения микробоценоза в почвах при разных дозах внесения биоугля (14)(15)(16), сроках инкубации (15,17) и различном его качестве (18). Но при этом не выявлены четкие закономерности модуляции профиля микробиоты под влиянием биоугля.…”