Water N/P ratios influence emergent plant nutrient uptake and growth by altering the microbial activities of rhizosphere soil

IF 4.8 2区 农林科学 Q1 SOIL SCIENCE Applied Soil Ecology Pub Date : 2024-10-09 DOI:10.1016/j.apsoil.2024.105677
Fuchao Zheng , Dehua Zhao , Shenglai Yin , Dianpeng Li , Miao Zhang , Zhengjie Zhu , Shuqing An
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Abstract

Pollutant water discharge greatly alters surface water stoichiometric characteristics, resulting in potential risks for aquatic ecosystems. Few studies have been conducted on the effects of increased water nitrogen (N) and phosphorus (P) ratios (N/P) on nutrient uptake by emergent plants (EPs), which generally obtain nutrients from soil, as well as their mechanisms. A small-scale study was conducted to identify the effects of the influent water N/P ratio on nutrient absorption by reed (Phragmites australis), rhizosphere soil activity and the abundance of N- and P-related functional genes. Sterilization significantly decreased reed biomass and the accumulation of N and P, suggesting the importance of microbes in the rhizosphere and soil. Compared with the low-N/P treatment, the high-N/P treatment generally resulted in significantly greater reed biomass and reed N and P accumulation, as well as lower soil available N (AN) and available P (AP) and significantly greater soil enzyme activities of invertase and phosphatase (p < 0.05). Linear mixed model analysis suggested that reed N and P accumulation was determined mainly by rhizosphere soil AN and AP (negative correlation), respectively. The increased influent water N/P ratios clearly promoted the abundance of the phosphatase gene (phoD), phosphate-binding protein-encoding gene (pstS) and ammonia monooxygenase (amoA) in rhizosphere soil. Thus, although reeds obtain nutrients mainly from soil, an increased influent N/P ratio can increase reed biomass, N and P accumulation by improving the nutritional absorptive capacity and effectiveness of reeds.
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水的氮磷比通过改变根圈土壤的微生物活动影响新生植物的养分吸收和生长
污染物的排放会极大地改变地表水的化学计量特性,从而给水生生态系统带来潜在风险。关于水体氮(N)和磷(P)比率(N/P)的增加对挺水植物(EPs)养分吸收的影响及其机制,目前还鲜有研究。一项小规模研究旨在确定进水 N/P 比对芦苇(Phragmites australis)养分吸收、根瘤土壤活性以及 N 和 P 相关功能基因丰度的影响。灭菌大大降低了芦苇的生物量以及氮和磷的积累,表明微生物在根圈和土壤中的重要性。与低氮/磷处理相比,高氮/磷处理的芦苇生物量和芦苇氮、磷积累量明显增加,土壤可利用氮(AN)和可利用磷(AP)降低,土壤转化酶和磷酸酶活性明显增加(p <0.05)。线性混合模型分析表明,芦苇氮和磷的积累主要分别由根瘤土壤中的氮和磷决定(负相关)。进水 N/P 比的增加明显促进了根瘤土壤中磷酸酶基因(phoD)、磷酸结合蛋白编码基因(pstS)和氨单氧酶(amoA)的丰度。因此,虽然芦苇主要从土壤中获取养分,但增加氮磷比可以提高芦苇的营养吸收能力和有效性,从而增加芦苇的生物量、氮和磷的积累。
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来源期刊
Applied Soil Ecology
Applied Soil Ecology 农林科学-土壤科学
CiteScore
9.70
自引率
4.20%
发文量
363
审稿时长
5.3 months
期刊介绍: Applied Soil Ecology addresses the role of soil organisms and their interactions in relation to: sustainability and productivity, nutrient cycling and other soil processes, the maintenance of soil functions, the impact of human activities on soil ecosystems and bio(techno)logical control of soil-inhabiting pests, diseases and weeds.
期刊最新文献
Editorial Board Influence of land-use type on earthworm diversity and distribution in Yunnan: Insights from soil properties Breeding-induced changes in the rhizosphere microbial communities in Lima bean (Phaseolus lunatus) Corrigendum to “Characteristics of microbial community during the different growth stages of yam (Dioscorea opposita Thunb. cv. Tiegun)” [Appl. Soil Ecol. 201 (2024) 105519] Erratum to “Lack of inhibitory effects of 1-Octyne and PTIO on ammonia oxidizers, nitrite oxidizers, and nitrate formation in acidic paddy soils” [Appl. Soil Ecol. 203 (2024) 105673]
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