Residue‐ and nitrogen‐induced carbon mineralization varies with soil fertility status

IF 2.4 3区 农林科学 Q2 SOIL SCIENCE Soil Science Society of America Journal Pub Date : 2023-04-06 DOI:10.1002/saj2.20530
Tanjila Jesmin, Richard L. Mulvaney, Thomas W. Boutton
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Abstract

Abstract By increasing the input of corn ( Zea mays L.) residues, synthetic nitrogen (N) fertilization is often assumed to enhance soil storage of organic carbon (C), which could be especially beneficial for improving the fertility of depleted soils. To ascertain whether such a strategy can be effective, C mineralization was compared for two soils with different indigenous N contents by conducting a 60‐day laboratory incubation experiment that involved continuous monitoring of CO 2 emissions with periodic sampling for atmospheric δ 13 C analysis and for determination of soil microbial biomass and cellulolytic enzyme activities. The addition of exogenous N had a stimulatory effect on cumulative CO 2 production that was greater for the low than high N supplying soil and more prominent in the first than in the second month of incubation. During residue decomposition, microbial activities were maximized by incubating the low N soil with exogenous N, whereas cellulolytic enzyme activities were greater for the high N soil. Although intensive N fertilization can substantially increase the productivity of low‐fertility soils, the additional residue inputs thereby generated are more effective for promoting C mineralization than sequestration.
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残渣和氮诱导的碳矿化随土壤肥力状况而变化
通过增加玉米(Zea mays L.)残茬的输入,合成氮(N)施肥通常被认为可以提高土壤有机碳(C)的储存,这可能特别有利于提高枯竭土壤的肥力。为了确定这种策略是否有效,研究人员进行了为期60天的实验室培养实验,比较了两种不同原生氮含量土壤的碳矿化程度,该实验包括连续监测二氧化碳排放,定期采样大气δ 13c分析,并测定土壤微生物生物量和纤维素水解酶活性。外源氮的添加对累积CO 2产量的刺激作用在低氮供应土壤中大于高氮供应土壤,并且在孵化的第一个月比第二个月更为突出。在残渣分解过程中,外源氮与低氮土壤的微生物活性最大,而高氮土壤的纤维素水解酶活性更大。尽管密集施氮可以显著提高低肥力土壤的生产力,但由此产生的额外残留物投入对促进碳矿化比固存更有效。
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来源期刊
Soil Science Society of America Journal
Soil Science Society of America Journal 农林科学-土壤科学
CiteScore
5.40
自引率
3.40%
发文量
130
审稿时长
3.6 months
期刊介绍: SSSA Journal publishes content on soil physics; hydrology; soil chemistry; soil biology; soil biochemistry; soil fertility; plant nutrition; pedology; soil and water conservation and management; forest, range, and wildland soils; soil and plant analysis; soil mineralogy, wetland soils. The audience is researchers, students, soil scientists, hydrologists, pedologist, geologists, agronomists, arborists, ecologists, engineers, certified practitioners, soil microbiologists, and environmentalists. The journal publishes original research, issue papers, reviews, notes, comments and letters to the editor, and book reviews. Invitational papers may be published in the journal if accepted by the editorial board.
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