Effects of Tobacco Stalk Biochar- and Bamboo Biochar-based Fertilizers on Carbon, Nitrogen, and Microbes in Soil of Tobacco Field
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摘要:
目的 通过大田试验,研究烟秆和竹炭基肥施用对植烟土壤碳氮组分及微生物的影响,为提升植烟土壤质量提供依据。 方法 设置不施肥、烟草专用肥、烟秆炭基肥及竹炭基肥4个处理,研究烟秆与竹炭基肥施用后植烟土壤pH、碳、氮组分变化规律及其对酶活性、微生物群落的影响。 结果 与烟草专用肥处理相比,施用烟秆炭基肥和竹炭基肥,土壤pH均提高0.5个单位以上,可溶性有机碳含量分别提高21.4%和30.7%,易氧化有机碳含量分别提高32.4%和17.9%,可溶性有机氮含量分别提高50.7%和37.7%,颗粒有机氮含量分别提高28.0%和12.7%,土壤蔗糖酶活性分别提高9.4%和3.6%,微生物量碳含量均提高30%以上。烟秆炭基肥处理土壤细菌群落Chao1指数与烟草专用肥处理和竹炭基肥处理相比分别显著提高5.4%和3.2%,而三者间的土壤细菌群落Observed species和Shannon指数无显著差异。烟秆和竹炭基肥处理均影响土壤细菌群落组成结构,变形菌门与不施肥处理相比分别下降5.0%和3.4%。与烟草专用肥处理相比,竹炭基肥处理厚壁菌门丰度提高18.3%,烟秆炭基肥处理玫瑰弯菌属丰度提升64.8%。 结论 烟秆炭基肥及竹炭基肥均可提高土壤碳、氮组分含量,土壤酶活性和微生物群落丰度,进而优化土壤细菌群落结构。与竹炭基肥相比,烟秆炭基肥对改善土壤环境的效果更为明显。 Abstract:Objective Effects of applying tobacco stalk biochar- or bamboo biochar-based fertilizer on the carbon, nitrogen, and microorganisms in soil of tobacco-growing fields were compared. Method In a field experimentation, treatments using no fertilizer as control (CK), a fertilizer designed for tobacco farming (TF), a tobacco stalk biochar-based fertilizer (TBF), or a bamboo biochar-based fertilizer (BBF) were conducted. pH, carbon, nitrogen, enzyme activity, and microbial community of the soil samples were monitored. Result Compared to TF, either TBF or BBF raised by more than 0.5 on soil pH and on microbial biomass carbon by more than 30%; on soluble organic carbon, TBF did by 21.4% and BBF by 30.7%; on oxidizable organic carbon, TBF did by 32.4% and BBF by 17.9% (p<0.05); on soluble organic nitrogen, TBF did by 50.7% and BBF by 37.7%; on particulate organic nitrogen, TBF did by 28.0% and BBF by 12.7%; and on invertase activity, TBF did by 9.4% and BBF by 3.6%. The Chao1 index of the microbial community in the TBF-treated soil was significantly higher than that of TF-treated counterpart by 5.4% and that of BBF-treated soil by 3.2%. However, there were no significant differences on the observed species or Shannon index of the microbial communities in soils under different treatments. Both TBF and BBF significantly affected the structure of the microbial community in the soil. Notably, the Proteobacteria population decreased by 5.0% under TBF treatment and by 3.4% under BBF treatment in comparison to CK. Even when TF was applied, BBF still managed to generate 18.3% greater abundance on Firmicutes, while TBF 64.8% on Curvularia, in the soil. Conclusion Either TBF or BBF treatment could increase the content of carbon, nitrogen, enzyme activity, and microbial abundance in the tobacco field soil. It helped optimize the structure of the microbial community as well. However, TBF seemed to benefit the improvements more than BBF did. -
表 1 生物炭基本理化性质
Table 1. Basic physiochemical properties of biochar
材料
Test materialpH TC/(g·kg−1) TN/(g·kg−1) TP/(g·kg−1) TK/(g·kg−1) 比表面积
Specific surface area/(m2·g−1)烟秆炭 Tobacco stem biochar 9.74 645.20 22.13 2.53 118.58 10.12 竹炭 Bamboo biochar 11.2 774.47 3.90 2.20 4.10 6.40 表 2 烟秆和竹炭基肥处理对土壤不同生育期pH的影响
Table 2. Effects of TBF and BBF on soil pH at tobacco growth stages
处理
Treatment伸根期
Rooting stage旺长期
Prosperous period成熟期
Mature periodCK 5.07±0.03 a 4.91±0.01 b 4.84±0.05 b F 4.59±0.05 b 4.55±0.05 c 4.50±0.07 c YBF 5.18±0.06 a 5.09±0.09 a 5.03±0.04 a ZBF 5.20±0.07 a 5.07±0.04 a 5.01±0.02 a 不同小写字母表示处理间差异显著(P<0.05)。下同。
Data with different lowercase letters indicate significant differences between treatments (p<0.05).The same below.表 3 烟秆和竹炭基肥处理对土壤碳氮组分的影响
Table 3. Effects of TBF and BBF treatments on soil carbon and nitrogen
处理 Treatment SOC/(g·kg−1) DOC/(g·kg−1) LOC/(g·kg−1) POC/(g·kg−1) DON/(mg·kg−1) PON/(mg·kg−1) NH4+-N/(mg·kg−1) NO3−-N/(mg·kg−1) CK 14.41±0.27 c 0.47±0.0 1b 2.38±0.05 d 2.86±0.10 d 19.43±2.22 b 169.87±7.06 d 6.32±1.27 c 1.14±0.04 c F 14.62±0.36 c 0.50±0.02 b 2.87±0.05 c 3.10±0.06 c 25.75±3.07 b 208.26±4.70 c 9.17±0.31 c 4.97±0.36 a YBF 15.38±0.09 b 0.61±0.01 a 3.80±0.11 a 3.66±0.06 a 38.83±3.91 a 266.56±6.22 a 29.38±2.86 a 2.63±0.19 b ZBF 16.16±0.33 a 0.65±0.03 a 3.38±0.25 b 3.40±0.13 b 35.45±4.89 a 234.66±7.55 b 22.30±1.48 b 2.58±0.18 b 不同小写字母表示处理间差异显著(P<0.05)。下同。
Data with different lowercase letters indicate significant differences between treatments (p<0.05).The same below.表 4 烟秆和竹炭基肥处理土壤细菌群落alpha多样性
Table 4. Alpha diversity of microbial community in soil treated with TBF or BBF
处理
TreatmentChao1指数
Chao1 index
物种数目指数
Observed speciesShannon指数
Shannon indexCK 4022.74±50.92 d 2736.40±93.64 b 9.59±0.16 b F 4070.07±48.52 bc 2823.60±40.32 ab 9.76±0.15 ab YBF 4291.49±51.99 a 2905.73±51.17 a 9.86±0.10 ab ZBF 4160.59±23.85 b 2945.60±38.34 a 10.04±0.09 a -
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