草莓大棚内沼气池的生态效益分析

沼气池建在大棚内可增加沼气池的冬季产气量,沼气燃烧可为作物提供CO2气肥、光照及热量,沼渣、沼液亦可作为肥料和植保产品施用,具有较好的综合效益。为了弄清沼气池在大棚内的生态效益,本文对沼气池在草莓大棚内应用的经济效益、碳减排效果及对土壤质量的影响做了估算和分析。结果显示,沼气池建在大棚内可增加经济收入5 436元,而沼气池建在大棚外亦可增加经济收入1 126元,其固态投资收益率分别为187.19%和42.65%;将沼气池(10 m3)建在大棚外,可减少温室气体排放0.164 t CO2当量,而将沼气池建在大棚内每年可减少温室气体排放0.423 t CO2当量;沼气池在草莓大棚内应用后可有效增加土壤氮磷钾含量,降低土壤容重,提高土壤质量。与建在棚外相比,将沼气池建在棚内可获得更好的综合效益。

Ecological Benefit Analysis of Applying Biogas Pool in Strawberry Greenhouse

The biogas pools would produce more methane if they are constructed in greenhouse in winter.Burned biogas can provide CO2 fertilizer,illumination and heat;biogas slurry and residues can be used as fertilizer or plant protection materials,so biogas pool constructed in greenhouse can generate better comprehensive benefits.In order to make clear the ecological benefits of applying biogas pool in strawberry greenhouse,the economic benefit,carbon emission reduction and its effect on soil quality were analyzed and estimated.The results showed that the income increased by 5 436 Yuan RMB with the biogas pool constructed in greenhouse,and also could increase by 1 126 Yuan when constructed outside greenhouse.Their rates of return on investment were 187.19% and 42.65 % respectively.The carbon emission reduction amount decreased by 0.164 ton and 0.423 ton CO2 equivalent with biogas pool constructed outside and in greenhouse respectively.The application of biogas pool in strawberry greenhouse could increase the contents of nitrogen,phosphorus and potassium in soil,decrease the soil bulk density,and improve the soil quality.In all,higher comprehensive benefit could be obtained with the biogas pool constructed in greenhouse than that constructed outside.