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引用本文:张瑄文,李三姗,甘琳,何晓云,杨柳燕.生物质炭对苦草(Vallisneria spiralis)种子萌发与生长的影响.湖泊科学,2018,30(4):1041-1051. DOI:10.18307/2018.0417
ZHANG Xuanwen,LI Sanshan,GAN Lin,HE Xiaoyun,YANG Liuyan.Effects of biochar on seed germination and growth of Vallisneria spiralis. J. Lake Sci.2018,30(4):1041-1051. DOI:10.18307/2018.0417
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生物质炭对苦草(Vallisneria spiralis)种子萌发与生长的影响
张瑄文1, 李三姗1, 甘琳1, 何晓云2, 杨柳燕1
1.南京大学环境学院, 南京大学污染控制与资源化研究国家重点实验室, 南京 210046;2.浙江省环境监测中心, 杭州 310012
摘要:
为了探究生物质炭作为生长基质对水生植物种子萌发和生长的影响,选用典型沉水植物苦草(Vallisneria spiralis)作为受试植物,测定不同氮、磷营养盐浓度和不同粒径的生物质炭作用下对苦草种子萌发率、幼苗形态与生物量,同时分析水体中硝态氮、亚硝态氮、氨氮和正磷酸盐磷浓度变化过程.结果表明:生物质炭存在使水体中亚硝态氮浓度低于检测限,使水体正磷酸盐磷浓度上升至1.28~2.43 mg/L,为最高添加磷浓度的3.2~6.1倍,从而改变了苦草生长环境.小粒径生物质炭(0.25~0.5 mm)组中水体最终氨氮浓度(0.05 mg/L)远远低于大粒径生物质炭(1~2 mm)组中水体最终氨氮浓度(0.39~0.85 mg/L),即生物质炭粒径大小会影响水体最终营养盐浓度和氮素赋存形态.与大粒径生物质炭组和石英砂对照相比,小粒径组苦草种子萌发率明显升高,可达80%以上,并促进苦草幼苗生长.因此,小粒径生物质炭能提高苦草种子萌发和幼苗生长,在大型水生植物恢复工程中具有一定的应用前景.
关键词:  生物质炭  粒径  苦草  萌发率  幼苗生长    
DOI:10.18307/2018.0417
分类号:
基金项目:国家水体污染控制与治理科技重大专项(2017ZX07204)资助.
Effects of biochar on seed germination and growth of Vallisneria spiralis
ZHANG Xuanwen1, LI Sanshan1, GAN Lin1, HE Xiaoyun2, YANG Liuyan1
1.State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, P. R. China;2.Zhejiang Environmental Monitoring Centre, Hangzhou 310012, P. R. China
Abstract:
In order to explore the effect of biochar on the germination and growth of aquatic plants, atypical submerged plant, Vallisneria spiralis, was tested under the condition of two sizes of biochar (small size biochar, SSB; large size biochar, LSB) and silica sand as the substrate of Vallisneria spiralis seeds. The germination and growthof Vallisneria spiralis seeds were investigated under four nutrient concentrations. The germination rate, seedling morphology, biomass of Vallisneria spiralis, nitrate nitrogen, nitrite nitrogen, ammonia nitrogen and orthophosphate in medium were measured after 30 days of cultivation. The results showed that biochar could change the environment of the substrate of Vallisneria spiralis. It could also reduce nitrite nitrogen to lower the detection limit and release the orthophosphate. The aqueous phosphorus concentration was 1.28-2.43 mg/L, reaching 3.2-6.1 times of initial concentration, and was beneficial to the germination and seedling growth of the seeds. The size of biochar could also influence water nutrient concentrations. The finial ammonia nitrogen concentration (0.05 mg/L) was lower in SSB group than that in LSB group (0.39-0.85 mg/L), which was positive for seedling growth, and the germination rate of 80% in SSB was higher than that in control and LSB, thus, SSB has more potential in aquatic plants restoration.
Key words:  Biochar  particle size  Vallisneria spiralis  germination rate  seedling growth  nitrogen  phosphorus
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