水分对若尔盖湿地不同微生境土壤温室气体排放的影响

发布时间：2018-01-06 21:31

本文关键词：水分对若尔盖湿地不同微生境土壤温室气体排放的影响　出处：《北京林业大学》2016年硕士论文　论文类型：学位论文

【摘要】：为探究水分对若尔盖湿地不同微生境土壤温室气体排放的影响及其影响机理,本论文以若尔盖湿地塔头、塔间、坡下和坡上四种微生境土壤为研究对象,通过野外采样及室内培养实验,模拟了干处理、湿处理及干湿交替处理下土壤的温室气体排放及土壤理化性质变化。结果表明,(1)四种微生境土壤有机碳库存在显著差异,表现为塔头生境塔间生境坡上生境坡下生境；(2)水分及微生境类型均对土壤温室气体排放及土壤理化性质存在显著影响。干处理抑制了温室气体的排放,干湿交替促进N2O及CH4的排放,但抑制了塔间、坡上和坡下生境土壤的CO2排放；四种生境间,塔头的CO2排放量最高,塔间的次之,干处理下塔头N2O排放最高,湿处理和干湿交替处理下塔头排放最低；(3)生境显著影响土壤DOC和MBC含量,但水分仅对土壤DOC有显著影响,干湿交替处理下DOC含量的增长量最多,干处理条件下的最少。不同生境间,塔头和塔间生境的DOC和MBC增长量均显著高于坡下和坡上生境；(4)不同生境间,塔头的C02累积排放当量最高,不同水分处理下,干湿交替产生的CO2当量最高,干处理的最低；(5)分析温室气体排放与土壤理化性质之间的相关性发现,土壤DOC和MBC含量之间存在极显著正相关关系；CO2排放通量和累积排放量同DOC、MBC、铵态氮和硝态氮存在极显著正相关关系,CH4与硝态氮存在负相关关系,而N2O未与他们有显著关系。塔头生境是高寒湿地特有的微生境类型,目前有关塔头的研究主要集中在北极圈塔头生境内部的养分循环及植被群落结构上,有关水分对塔头生境温室气体排放的研究还较少。同时,土壤温室气体排放还受多方因素的综合影响,为进一步探讨塔头生境在温室气体排放上的贡献,还应加强野外原位调查实验,以进一步了解塔头生境的温室气体排放机理,为气候变化下若尔盖湿地土壤温室气体源汇效应提供借鉴。
[Abstract]:In order to investigate the effects of water on different microhabitats of greenhouse gas emissions in Ruoergai wetland and its influence mechanism, this paper Yiruoergai wetland tower head, tower, slope and the slope of the four microhabitats in soil as the research object, through field sampling and indoor culture experiments, simulated dry processing, wet processing and wetting and drying soil the greenhouse gas emissions and the change of soil physical and chemical properties. The results showed that (1) there are significant differences between the four microhabitats of soil organic carbon, as head of tower tower slope habitat habitat habitat slope habitat; (2) water and microhabitat type on greenhouse gas emissions from soil and soil physico-chemical properties significant effect. Dry treatment inhibited the greenhouse gas emissions, promote N2O and CH4 emissions of wet dry cycles, but inhibited the tower, the slope and the slope habitat soil CO2 emissions; four kinds of habitats, the tower head is the highest CO2 emissions, The tower of dry treatment under the tower head N2O the highest emission, wet treatment and wet / dry treatment tower emissions minimum; (3) habitat significantly affected soil DOC and MBC content, but the water had significant effects on soil DOC, wetting and drying DOC content under the growth amount is maximum, dry conditions the least. In different habitats, DOC and MBC increase tower head and tower habitats were significantly higher than that of slope and slope habitats; (4) between different habitats, the tower head C02 cumulative emissions equivalent maximum, under different water treatments, the highest CO2 equivalent of alternating wet and dry, dry treatment (the lowest; 5) correlation analysis between physical and chemical properties of greenhouse gas emissions and soil found between soil DOC and MBC content were positively correlated; CO2 emission flux and cumulative emissions of DOC, MBC, ammonium nitrogen and nitrate nitrogen had significant positive correlation with the nitrate nitrogen, CH4 Negative correlation between N2O and they did not have a significant relationship. The tower head habitat is alpine wetland unique microhabitat types, nutrient cycling and vegetation community structure studies of the tower head is mainly concentrated in the interior of the tower head habitat in the Arctic, the water on the tower head habitat of greenhouse gas emissions is also less. At the same time, greenhouse gas emissions is affected by various factors, in order to further explore the tower head habitat in greenhouse gas emissions contribution, should also strengthen the field investigation and experiment, in order to further understand the mechanism of greenhouse gas emission tower habitat, provide a reference for Ruoergai wetland soil source sink effect of greenhouse gases under the climate change.

【学位授予单位】：北京林业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：S154.1

【相似文献】