Impact of Land Degradation on Soil Microbial Biomass and Activity in Northeast Brazil

J. S. NUNES; A. S. F. ARAUJO; L. A. P. L. NUNES; L. M. LIMA; R. F. V. CARNEIRO; A. A. C. SALVIANO; S. M. TSAI

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Impact of Land Degradation on Soil Microbial Biomass and Activity in Northeast Brazil

机译：土地退化对巴西东北部土壤微生物生物量和活性的影响

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Land degradation causes great changes in the soil biological properties.The process of degradation may decrease soil microbial biomass and consequently decrease soil microbial activity.The study was conducted out during 2009 and 2010 at the four sites of land under native vegetation (NV),moderately degraded land (LDL),highly degraded land (HDL) and land under restoration for four years (RL) to evaluate changes in soil microbial biomass and activity in lands with different degradation levels in comparison with both land under native vegetation and land under restoration in Northeast Brazil.Soil samples were collected at 0-10 cm depth.Soil organic carbon (SOC),soil microbial biomass C (MBC) and N (MBN),soil respiration (SR),and hydrolysis of fluorescein diacetate (FDA) and dehydrogenase (DHA) activities were analyzed.After two years of evaluation,soil MBC,MBN,FDA and DHA had higher values in the NV,followed by the RL.The decreases of soil microbial biomass and enzyme activities in the degraded lands were approximately 8-10 times as large as those found in the NV.However,after land restoration,the MBC and MBN increased approximately 5-fold and 2-fold,respectively,compared with the HDL.The results showed that land degradation produced a strong decrease in soil microbial biomass.However,land restoration may promote short- and long-term increases in soil microbial biomass.

机译：土地退化导致土壤生物学特性发生巨大变化。退化过程可能会降低土壤微生物的生物量，从而降低土壤微生物的活性。该研究于2009年和2010年在天然植被（NV）下的四个土地上进行。退化土地（LDL），高退化土地（HDL）和四年恢复中的土地（RL），以评估退化水平不同的土地中土壤微生物生物量和活性的变化，与天然植被下的土地和恢复中的土地相比巴西东北部。在0-10厘米深度处收集土壤样品。土壤有机碳（SOC），土壤微生物生物量C（MBC）和N（MBN），土壤呼吸（SR）以及二乙酸荧光素（FDA）的水解和脱氢酶经过两年的评估，土壤MBC，MBN，FDA和DHA的NV值较高，其次是RL。土壤微生物量和酶活度的降低分级的土地大约是NV的8到10倍。但是，土地恢复后，MBC和MBN分别比HDL高出约5倍和2倍。结果表明，土地退化产生了土壤微生物量的大幅下降。但是，土地恢复可能会促进土壤微生物量的短期和长期增加。

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《土壤圈（英文版）》 |2012年第1期|88-95|共8页
作者
J. S. NUNES; A. S. F. ARAUJO; L. A. P. L. NUNES; L. M. LIMA; R. F. V. CARNEIRO; A. A. C. SALVIANO; S. M. TSAI;
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Soil Quality Lab., Agricultural Science Center, Federal University of Piauí, Teresina, PI(Brazil);

Soil Quality Lab., Agricultural Science Center, Federal University of Piauí, Teresina, PI(Brazil);

Center of Nuclear Energy in Agriculture, University of S(a)o Paulo, Piracicaba, SP(Brazil);

Soil Quality Lab., Agricultural Science Center, Federal University of Piauí, Teresina, PI(Brazil);

Soil Quality Lab., Agricultural Science Center, Federal University of Piauí, Teresina, PI(Brazil);

Soil Quality Lab., Agricultural Science Center, Federal University of Piauí, Teresina, PI(Brazil);

Soil Quality Lab., Agricultural Science Center, Federal University of Piauí, Teresina, PI(Brazil);

Center of Nuclear Energy in Agriculture, University of S(a)o Paulo, Piracicaba, SP(Brazil);

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Impact of Land Degradation on Soil Microbial Biomass and Activity in Northeast Brazil

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