中国亚热带地区树种混交后,树种特征通过改变可溶性有机钾影响土壤钾的生物利用率

IF 4 2区 农林科学 Q2 SOIL SCIENCE
Piaoyun Deng, Yunchao Zhou, Fenghua Tang, Wensha Chen
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引用次数: 0

摘要

人们一直强调将单一种植转变为混合种植,以提高生态系统的生产力和服务。然而,在磷相对稀缺的中国亚热带酸性土壤中,树种特性对磷(P)生物利用率的影响尚不完全清楚。本研究探讨了五种阔叶树(Bretschneidera sinensis、Manglietia conifera、Cercidiphyllum japonicum、Michelia maudiae 和 Camellia oleifera)与针叶树(Pinus massoniana)混合种植后,土壤生物磷组分的变化以及矿物质和微生物特性对磷转化的影响。结果表明,与单株种植相比,大多数混合种植能显著提高 pH 值和柠檬酸,降低可交换的 Fe3+ 和 Al3+ 以及铁和铝氧化物的活化,从而显著减少钙的沉淀和吸附。混合种植明显提高了磷酸酶活性,改变了携带 phoD 和 pqqC 基因的钾移动细菌群落组成,从而促进了有机钾矿化和无机钾(Pi)解吸。混合种植提高了微生物生物量和微生物生物量 P 转化的相对速率。总体而言,引入阔叶树种,尤其是引入具有相对较高的枯落物质量和地下分泌物(如柠檬酸、磷脂、钙、镁、钾、钙、镁)的树种(如日本蕨、毛蕊花和油茶),可提高微生物生物量和微生物生物量 P 的相对转化率。如柠檬酸、磷酸酶),能显著提高难溶性钙离子(HCl-P)的增溶、化学吸附钙离子(柠檬酸钙-P)的解吸以及酵素钙-P 的积累和矿化,从而增加可用的钙离子池。冗余分析表明,钾组分主要由磷酸酶、可交换阳离子、底层新枯木质素/N 和柠檬酸驱动。总之,我们强调了在建设混交种植园时选择具有协同或互补效应的树种混合物以缓解土壤钾限制的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Tree species identity affects soil P bioavailability by altering labile organic P after tree mixing in subtropical China

Tree species identity affects soil P bioavailability by altering labile organic P after tree mixing in subtropical China

Converting monocultures to mixed plantations has been emphasized to improve ecosystem productivity and services. However, the impact of tree species identity on phosphorus (P) bioavailability in acidic soils in subtropical China, where P is relatively scarce, is not fully understood. This study explored the changes in soil biologically-based P fractions and the effect of mineral and microbial properties on P transformation after mixing five broadleaved trees (Bretschneidera sinensis, Manglietia conifera, Cercidiphyllum japonicum, Michelia maudiae and Camellia oleifera) individually with coniferous trees (Pinus massoniana). The results showed that most mixed plantations significantly increased pH and citric acid and decreased exchangeable Fe3+ and Al3+ and the activation of Fe and Al oxides compared with monospecific plantations, which significantly reduced P precipitation and adsorption. Mixed planting significantly increased phosphatase activity and altered the community composition of P-mobilizing bacteria carrying phoD and pqqC genes, which contributed to organic P mineralization and inorganic P (Pi) desorption. Mixed planting increased microbial biomass and the relative rate of microbial biomass P turnover. Labile organic P (Enzyme-P) was a potentially significant source of soluble Pi (CaCl2-P) among the biologically-based P fractions, plus microbial biomass P. Overall, introducing broadleaved species, especially in species (e.g. Cercidiphyllum japonicum, Michelia maudiae and Camellia oleifera) with relatively high litter quality and belowground secretions (e.g. citric acid, phosphatase), significantly increased the solubilization of recalcitrant Pi (HCl-P), desorption of chemisorbed Pi (Citrate-P) and accumulation and mineralization of Enzyme-P, thereby increasing the available P pools. Redundancy analysis demonstrated that P fractions were mainly driven by phosphatases, exchangeable cations, floor fresh litter lignin/N and citric acid. Altogether, we highlight the importance of choosing tree species mixtures that have synergistic or complementary effects when constructing mixed plantations in order to alleviate soil P limitations.

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来源期刊
European Journal of Soil Science
European Journal of Soil Science 农林科学-土壤科学
CiteScore
8.20
自引率
4.80%
发文量
117
审稿时长
5 months
期刊介绍: The EJSS is an international journal that publishes outstanding papers in soil science that advance the theoretical and mechanistic understanding of physical, chemical and biological processes and their interactions in soils acting from molecular to continental scales in natural and managed environments.
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