中国水土保持科学2017，Vol.15Issue(3)：26-35,10.DOI:10.16843/j.sswc.2017.03.004
生物炭对植烟土壤氮素形态迁移及微生物量氮的影响
Effects of biochar on nitrogen transformation and the microbial biomass nitrogen under different nitrogen application rates
摘要
Abstract
[Background]This paper studies the effect of applied biochar on the nitrogen (N) transformation under different N levels in the tobacco-planting soil,because the C/N ratio in the soil for continuous planting tobacco in Henan province is not balanced,resulting in the tobacco quality reduced.[Methods] The field experiment was carried out with different N levels under the biochar application;it is located in Daguo town of Linying County,Henan province (El13°81′,N33°79′).Five treatments were set as:1) no N no biochar (CK);the other four applied with 1 600 kg/hm2 biochar,with four N levels:2) 0kg/hm2(N0);3) 37.5 kg/hm2(N1);4) 52.5 kg/hm2(N2);5) 67.5 kg/hm2(N3).Based on the five sample points,the total N (TN),available N (AN),nitrate N (NO3--N) and ammonium N (NH4+-N) in three soil layers (i.e.0-20 cm,20-40 cm,and 40-60 cm) as well as the soil microorganism biomass N (SMBN) in 0-20 cm soil layer were measured and analyzed.[Results] The biochar application reduced the N content in the deep layer,which indicated that it elevated N sequestration in top soil layer.Compared with the CK,the decrement of TN,AN,NO3--N,and NH4+-N content was 11.21％,49.07％,42.29％ and 31.35％,respectively under the no treatment.The AN,NO3--N,and NH4+-N content mainly existed in 0-20 cm soil layer,and all of them increased with N application rate.The highest content of TN,AN,NH4+-N occurred under N3 treatment,which was 2.10 g/kg,261.86 g/kg,264.90 mg/kg,and 49.80 mg/kg,respectively.While the NO3--N content reduced with the soil layer increased,and it concentrated in 0-20 cm layer with the highest level as 264.90 mg/kg in N3 treatment.Moreover,the NO3--N content in 20-40 cm soil layer was significantly different from that of other soil layer under different N level.The effect of N application rate on its transformation presented before 30 d after the tobacco transplanted.The biochar application increased the SMBN after tobacco transplanted 60 d,while the effect of the amount of N fertilizer on the microbial biomass nitrogen entropy was mainly reflected after tobacco transplanted 30 d.[Conclusions] The effect of N application rate on soil N content mainly in 0-20 cm soil layer,and it was significantly affected during the early stage of tobacco growth.The biochar restrained the N transformation in soil with lower N application rate,but with little effect under higher N application rate.It is suggested that the biochar combined with 67.5 kg/km2 N application is the optimal practice to improve soil N content in central area of Henan province.关键词
植烟土壤/氮素/生物炭/施氮量/迁移Key words
tobacco-planted soil/nitrogen/biochar/nitrogen application rate/transformation分类
农业科技引用本文复制引用
张弘,李影,张玉军,朱金峰,刘世亮,刘芳,姜桂英..生物炭对植烟土壤氮素形态迁移及微生物量氮的影响[J].中国水土保持科学,2017,15(3):26-35,10.基金项目
河南省烟草公司重大面上项目“不同生物炭对植烟土壤碳氮比和紧实度调节机制研究及应用”(LYKJ201504),“烟田有机废弃物高效生物发酵资源化利用与技术集成”(HYKJ201215) （LYKJ201504）
