Effects of co-applied biochar and plant growth-promoting bacteria on soil carbon mineralization and nutrient availability under two nitrogen addition rates

IF 6.2 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Ecotoxicology and Environmental Safety Pub Date : 2023-11-01 DOI:10.1016/j.ecoenv.2023.115579
Yiping Zou , Zhengfeng An , Xinli Chen , Xiang Zheng , Ben Zhang , Shuyue Zhang , Scott X. Chang , Jianli Jia
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Abstract

In the background of climate warming, the demand for improving soil quality and carbon (C) sequestration is increasing. The application of biochar to soil has been considered as a method for mitigating climate change and enhancing soil fertility. However, it is uncertain whether the effects of biochar application on C-mineralization and N transformation are influenced by the presence or absence of plant growth-promoting bacteria (PGPB) and soil nitrogen (N) level. An incubation study was conducted to investigate whether the effects of biochar application (0 %, 1 %, 2 % and 4 % of soil mass) on soil respiration, N status, and microbial attributes were altered by the presence or absence of PGPB (i.e., Sphingobium yanoikuyae BJ1) under two soil N levels (N0 and N1 soils as created by the addition of 0 and 0.2 g kg−1 urea- N, respectively). The results showed that biochar, BJ1 strain and their interactive effects on cumulative CO2 emissions were not significant in N0 soils, while the effects of biochar on the cumulative CO2 emissions were dependent on the presence or absence of BJ1 in N1 soils. In N1 soils, applying biochar at 2 % and 4 % increased the cumulative CO2 emissions by 141.0 % and 166.9 %, respectively, when BJ1 was absent. However, applying biochar did not affect CO2 emissions when BJ1 was present. In addition, the presence of BJ1 generally increased ammonium contents in N0 soils, but decreased nitrate contents in N1 soils relative to the absence of BJ1, which indicates that the combination of biochar and BJ1 is beneficial to play the N fixation function of BJ1 in N0 soils. Our results highlight that biochar addition influences not only soil C mineralization but also soil available N, and the direction and magnitude of these effects are highly dependent on the presence of PGPB and the soil N level.

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在两种氮添加速率下,生物炭和植物生长促进菌对土壤碳矿化和养分有效性的影响。
在气候变暖的背景下,对改善土壤质量和固碳的需求正在增加。生物炭在土壤中的应用被认为是缓解气候变化和提高土壤肥力的一种方法。然而,目前尚不确定施用生物炭对碳矿化和氮转化的影响是否受到植物生长促进细菌(PGPB)的存在或不存在以及土壤氮水平的影响。进行了一项培育研究,以研究在两种土壤氮水平下(分别添加0和0.2 g kg-1尿素-N产生的N0和N1土壤),施用生物炭(土壤质量的0%、1%、2%和4%)对土壤呼吸、氮状况和微生物属性的影响是否因PGPB(即Sphingobium yanoikuyae BJ1)的存在或不存在而改变。结果表明,在N0土壤中,生物炭、BJ1菌株及其相互作用对累积CO2排放的影响不显著,而生物炭对累积CO2的影响取决于N1土壤中是否存在BJ1。在N1土壤中,当BJ1不存在时,施用2%和4%的生物炭可使累积CO2排放量分别增加141.0%和166.9%。然而,当存在BJ1时,施用生物炭不会影响CO2排放。此外,与没有BJ1相比,BJ1的存在通常增加了N0土壤中的铵含量,但降低了N1土壤中的硝酸盐含量,这表明生物炭和BJ1的结合有利于发挥BJ1在N0土壤的固氮功能。我们的研究结果强调,生物炭的添加不仅影响土壤碳矿化,还影响土壤有效氮,这些影响的方向和大小在很大程度上取决于PGPB的存在和土壤氮水平。
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来源期刊
CiteScore
12.10
自引率
5.90%
发文量
1234
审稿时长
88 days
期刊介绍: Ecotoxicology and Environmental Safety is a multi-disciplinary journal that focuses on understanding the exposure and effects of environmental contamination on organisms including human health. The scope of the journal covers three main themes. The topics within these themes, indicated below, include (but are not limited to) the following: Ecotoxicology、Environmental Chemistry、Environmental Safety etc.
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