首页|Is magnesium deficiency the major cause of needle chlorosis of Pinus taeda in Brazil?

Is magnesium deficiency the major cause of needle chlorosis of Pinus taeda in Brazil?

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Needle chlorosis(NC)in Pinus taeda L.systems in Brazil becomes more frequent after second and third har-vest rotation cycles.In a study to identify factors contribut-ing to yellowing needle chorosis(YNC),trees were grown in soils originating from contrasting parent materials,and soils and needles(whole,green and chlorotic portions)from 1-and 2-year-old branches and the first and second needle flush release at four sites with YNC on P.taeda were analyzed for various elements and properties.All soils had very low base levels(Ca2+,Mg2+and K+)and P,suggesting a possible lack of multiple elements.YNC symptoms started at needle tips,then extended toward the needle base with time.First flush needles had longer portions with YNC than second flush needles did.Needles from the lower crown also had more symptoms along their length than those higher in the canopy.Symptoms were similar to those reported for Mg.In chlorotic portions,Mg and Ca concentrations were well below critical values;in particular,Mg levels were only one third of the critical value of 0.3 g kg-1.Collectively,results suggest that Mg deficiency is the primary reason for NC of P.taeda in various parent soils in Brazil.

Nutritional deficiencyForest managementSoil depletionPine foliar analysisNeedle chlorosis

Ant?nio Carlos Vargas Motta、Shizuo Maeda、Valdécio dos Santos dos Santos Rodrigues、Tamires Maiara Ercole、Stephen Arthur Prior、Ana Elisa Lyra Brumat、Amanda Pacheco Cardoso Moura、Julierme Zimmer Barbosa、Jo?o Bosco Vasconcellos Gomes、Tao Xu

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Department of Soil Sciences and Agriculture Engineering,,Federal University of Paraná,R.dos Funcionários,1540.,Curitiba,Paraná CEP 80035-050,Brazil

Brazilian Agricultural Research Company,Embrapa Florestas,Estr.da Ribeira-Br-476,Km 111-Parque Monte Castelo.,Colombo,Paraná CEP 83411-000,Brazil

United States Department of Agriculture-Agricultural Research Service,USDA-ARS National Soil Dynamics Laboratory,411 South Donahue Drive,Auburn,AL 36832,USA

Reforestation Remasa,Rodovia PR 170-Km 522.,Bituruna,Paraná CEP 84640-000,Brazil

Federal Institute of Southeast of Minas Gerais,R.Luz Interior,360.,Juiz de Fora,Minas Gerais CEP 36030-713,Brazil

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National council for scientific and technological development(CNPq)Higher Education Personnel Improvement Coordination(CAPES)

2024

10.1007/s11676-023-01656-9

林业研究(英文版)
东北林业大学,中国生态学学会

林业研究(英文版)

CSTPCDEI
影响因子：0.365
ISSN：1007-662X
年,卷(期)：2024.35(2)
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