沼液施用对土壤温室气体排放的影响

发布时间：2018-03-12 14:01

本文选题：沼液　切入点：土壤　出处：《广西大学》2017年硕士论文　论文类型：学位论文

【摘要】：厌氧发酵方式生产沼气是养殖场废弃物资源再利用的主要技术。伴随产生的的大量沼液主要处理方式是作为有机肥料灌溉农田。冬季,大部分农田闲置,农田土壤成为唯一消纳沼液的场所。施肥的农田土壤是大气温室气体重要排放源。本文采用土柱培养法,于2015年10月4日至2016年1月27日进行冬季不同时间间隔沼液灌溉土壤对温室气体二氧化碳(CO2)、甲烷(CH4)、氧化亚氮(N20)排放影响及对土壤基本性质(pH值、矿物质氮)的影响。试验期间沼液施用设置为:S6(每6天施加一次沼液)、S12(每12天施加一次沼液)、S18(每18天施加一次沼液)三个水平梯度,并作纯水处理。主要结论如下:1、施加沼液对农田土壤CO2排放影响不明显,不同沼液处理间累计排放通量(μgCO2· kg-1·h-1)分别为:2378(S6),1226(S12),1079(S18);2、施加沼液对农田土壤CH4排放略有增加,72天后增加量明显,土柱连续培养108天,不同沼液处理间累计排放通量(μgCH4·kg-1·h-1)分别为:32.8(S6),17.5(S12),26.8(S18);3、施加沼液农田土壤N2O的排放增加,土柱连续培养108天,不同沼液处理间累计排放通量(ngN2O kg-1·h 1)分别为:1263(S6),342(S12),228(S18);4、施加沼液提高土壤矿物质氮含量;不同沼液处理间土壤矿物质氮含量(mg/kg)分别为:2207(S6),1550(S12),2334(S18)。5、与施加纯水处理相比,沼液处理的土壤pH值升高,不同处理间土壤pH 值从 4.86 分别上升到为:6.24(S6),5.80(S12),5.74(S18);基于此试验连续观测结果:沼液施加于土壤可以提高提高土壤pH值,可用于酸性土壤修复;综合温室效应而言,沼液施用对土壤N2O排放起到明显促进作用;在冬季灌溉过程中沼液施用频率应控制在12天左右。
[Abstract]:Anaerobic fermentation is the main technology for the reuse of waste resources from livestock farms. The main treatment of the resulting large amount of biogas liquid is to irrigate the farmland as organic fertilizer. In winter, most of the farmland is idle, Farmland soil is the only place to absorb biogas liquid. The fertilized farmland soil is an important source of greenhouse gas emissions. The soil column culture method is used in this paper. From October 4th 2015 to January 27th 2016, soil irrigated with biogas liquid at different intervals in winter affected the emission of greenhouse gases, such as CO _ 2, Ch _ 4, N _ 2O _ 2, and its basic properties and pH value. Effect of mineral nitrogen. During the trial period, the biogas fluid was applied to three horizontal gradients: S6 (once every 6 days) (once every 12 days) (every 12 days) the biogas S18 (once every 18 days), The main conclusions were as follows: (1) the effect of biogas liquid on the CO2 emission of farmland soil was not obvious. The cumulative discharge flux (渭 gCO2 路kg-1 路h-1) of different biogas treatment was 2378S6 / 1226S1279-S18 / 2, respectively, and the increase of CH4 emission to farmland soil was obvious after 72 days' application of biogas liquid. The cumulative emission fluxes (渭 gCH4 路kg-1 路h-1) of soil column cultured for 108th days were respectively: 1: 32.8S6, 17.5 S12S12, 26.8S18K3. The N _ 2O emission from soil was increased, and the soil column was cultured continuously for 108days. The cumulative emission flux of NgN2O kg-1 路h 1 between different biogas liquid treatments was: 1 1263 S6 ~ (6) N ~ (34) S ~ (12) C ~ (2 +) ~ (22) C ~ (2 +) S ~ (18) C ~ (4), applying biogas liquid to increase the mineral nitrogen content of soil, the soil mineral nitrogen content of different biogas treatment was:% 2207S _ (61550) S _ (12) C _ (12) C ~ (2 34) S _ (18N) 路5. Compared with the pure water treatment, the soil pH value of the biogas liquid treatment was higher than that of the pure water treatment. The soil pH value of different treatments increased from 4.86 to 1: 6.24 S6, S6, S12, S12, S18, respectively. Based on the continuous observation results of this experiment, it was found that the application of biogas solution to soil could increase the pH value of soil and could be used for acid soil remediation; in the case of Greenhouse Effect, the pH value of the soil could be improved by adding the biogas solution to the soil. The application frequency of biogas liquid should be controlled around 12 days during winter irrigation.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S145.2;S154.1

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