Biochar addition affects root morphology and nitrogen uptake capacity common reed (Phragmites australis)
Biochar addition affects root morphology and nitrogen uptake capacity common reed (Phragmites australis)
复制标题
添加生物炭会影响芦苇的根部形态和氮吸收能力（Phragmites australis）
DOI：
10.1016/j.scitotenv.2020.144381
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发表时间：
2021-01-05
影响因子：
9.8
通讯作者：
Gao, Jun-Qin
中科院分区：
文献类型：
--
作者：
Li, Qian-Wei;Liang, Jin-Feng;Gao, Jun-Qin
在大多数陆地生态系统中，氮(N)是限制植物生长的关键因素，据报道，生物炭改善了土壤特性和粮食产量。然而，生物炭对湿地生态系统中植物氮素吸收的影响及其潜在机制尚不清楚。因此，我们的研究试图描述在两种不同的氮沉积条件下[分别为30和60 kg N hm(-2)yr(-1)；即低N处理和高N处理]下添加生物炭对芦荟N吸收速率的影响。结果表明，在高N处理组，生物炭显著促进了南美白杨根系生物量的增长。相比之下，低氮处理组的细根比例增加，平均根径减小。低氮处理组南美白对虾的氮素吸收速率随着生物炭用量的增加而显着增加，氨态氮成为首选氮源。氨态氮和硝态氮的吸收速率与自生林的平均根径呈负相关。因此，我们的发现表明，生物炭可能通过改变根的形态发生来影响南美白杨的氮素吸收策略，从而为潜在的湿地植被恢复策略提供新的见解。(C)2020爱思唯尔B.V.保留所有权利。
Nitrogen (N) is a key factor that limits plant growth in most terrestrial ecosystems, and biochar reportedly improves soil characteristics and grain yields. However, the effects of biochar on plant N uptake in wetland ecosystems and the underlying mechanisms of these effects remain unclear. Therefore, our study sought to characterise the effects of biochar addition on Phragmites australis N absorption rates at two different N deposition conditions [30 and 60 kg N hm(-2) yr(-1); i.e., "low" and "high" N treatments, respectively]. Our results demonstrated that biochar significantly promoted root biomass growth in P. australis in the high N treatment group. In contrast, the low N treatment group exhibited an increased proportion of fine roots and a decrease in the average P. australis root diameter. The N absorption rate of P. australis in the low N treatment group significantly increased with biochar addition and ammonium N became the preferred N source. The absorption rates of both ammonium and nitrate N were negatively correlated with the average P. austratis root diameter. 'therefore, our findings indicate that biochar may affect the N uptake strategy of P. australis by altering root morphogenesis, thereby providing new insights into potential restoration strategies for wetland vegetation. (C) 2020 Elsevier B.V. All rights reserved.