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Effects of Biochar on the Agrochemical Indicators and Enzyme Activity of Soils in the Middle Taiga of Karelia
Eurasian Soil Science ( IF 1.4 ) Pub Date : 2021-12-23 , DOI: 10.1134/s106422932112005x
I. A. Dubrovina 1
Affiliation  

Abstract

A prolonged impact of the wood biochar applied at a dose of 1.5 kg/m2 on the dynamics of changes and trends in main agrochemical characteristics and enzyme activity in soils of different textures in the middle taiga zone of Karelia has been studied. The plots for 2-year-long monitoring (area, 5 m2) are randomly located (in four replicates) on a cropland with Umbric Podzol and Umbric Retisol-The following parameters are analyzed on a monthly basis during the growing season: \({\text{p}}{{{\text{H}}}_{{{{{\text{H}}}_{{\text{2}}}}{\text{O}}}}}\), pHKCl, K2O, P2O5, N–\({\text{NO}}_{3}^{ - }\), N–\({\text{NH}}_{4}^{ + }\), Corg, Ntot, and C/N; in addition, bulk density and catalase, invertase, and urease activities are assessed annually. Application of biochar to Umbric Podzol causes a significant increase in pHKCl, K2O, and mineral nitrogen content. Biochar has a considerable effect on the P2O5 content in the first year of observation. A divergent linear trend for pHKCl, K2O, and Corg is observed in the coarse-textured soil, which suggests a considerable aftereffect of the added biochar during the second year of observation. As for Umbric Retisol, biochar has a statistically significant effect only on \({\text{p}}{{{\text{H}}}_{{{{{\text{H}}}_{{\text{2}}}}{\text{O}}}}}\). The nitrate nitrogen content considerably decreases in the fine-textured soil against the background of insignificant variation in the content of ammonium nitrogen. The bulk density of soils changes insignificantly. Characteristic of both soils is a statistically significant increase in the Corg content and C/N ratio at a constant Ntot value, which creates the conditions favorable for nitrogen immobilization. Biochar does not influence the urease and catalase activities versus invertase, which responds to a change in carbon content is soils.



中文翻译:

生物炭对卡累利阿中针叶林土壤农化指标和酶活性的影响

摘要

已经研究了以 1.5 kg/m 2剂量施用的木质生物炭对卡累利阿中部针叶林区不同质地土壤中主要农化特性和酶活性的动态变化和趋势的影响。将为期 2 年的监测地块(面积,5 m 2)随机放置(四次重复)在种植有 Umbric Podzol 和 Umbric Retisol 的农田上——生长季节期间每月分析以下参数:\( {\text{p}}{{{\text{H}}}_{{{{{\text{H}}}_{{\text{2}}}}{\text{O}}}} }\) , pH KCl , K 2 O, P 2 O 5 , N– \({\text{NO}}_{3}^{ - }\) , N– \({\text{NH}}_ {4}^{ + }\), C org , N tot和 C/N; 此外,每年都会评估堆积密度和过氧化氢酶、转化酶和脲酶的活性。将 biochar 应用于 Umbric Podzol 会导致 pH KCl、K 2 O 和矿物氮含量显着增加。Biochar在观察的第一年对P 2 O 5含量有相当大的影响。在粗质地土壤中观察到pH KCl、K 2 O 和 C org的发散线性趋势,这表明在观察的第二年期间添加的生物炭产生了相当大的后遗症。至于 Umbric Retisol, biochar 仅对\({\text{p}}{{{\text{H}}}_{{{{{\text{H}}}_{{\text{2}}}}{\text{O}} }}}\)。在铵态氮含量变化不大的背景下,细质地土壤中硝态氮含量显着降低。土壤容重变化不大。两种土壤的特征是在恒定的 N tot值下,C org含量和 C/N 比在统计上显着增加,这为氮固定创造了有利条件。与转化酶相比,生物炭不影响脲酶和过氧化氢酶的活性,转化酶对土壤中碳含量的变化有反应。

更新日期:2021-12-24
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