【摘要】：本研究以牛糞為堆肥原料，鋸末作為調(diào)理劑，通過靜態(tài)好氧堆肥試驗，系統(tǒng)考察了棉稈木醋液的添加對牛糞堆肥理化性質(zhì)時空特征變化的影響，分析了棉稈木醋液的添加對牛糞堆肥過程溫室氣體排放的影響，探討了木醋液調(diào)控牛糞堆肥過程溫室氣體排放的作用機理，以及堆體溫度、有機質(zhì)和總氮與CH4:CO2的相關性大小。主要研究結(jié)果如下： （1）通過添加3.0%棉稈木醋液，堆體溫度提高5-7℃，堆肥周期縮短1-2天，加快堆肥進程，縮短了堆肥周期。添加3.0%棉稈木醋液，，在高溫期，堆體自由空域大于30%，堆肥腐熟期的自由空域呈現(xiàn)層次效應TopFASCenterFASBottomFAS。添加棉稈木醋液降低了14%-26%的碳損失，提高堆體中總氮含量。 （2）堆肥過程中，堆體上中下三層CO2、CH4的排放呈現(xiàn)先增加后減少的趨勢。CO2排放在后期有不同程度的增加，中間層增加程度最大，上層和下層最小；CH4排放量下層最大，中層次之，上層最小，出現(xiàn)梯度性變化。在整個堆肥過程中，CH4排放主要集中在前一周，占到總排放的60%-87%。通過向牛糞堆肥中添加3.0%的棉稈木醋液，在第7天后就抑制了CH4排放，2周后CH4排放基本為零，與對照組相比，堆肥結(jié)束CH4排放降低了15%。CH4和CO2排放在同一水平面上差異不顯著，而在垂直方向上存在顯著差異。添加3.0%的棉稈木醋液，CO2上中下平均排放量分別為22.04%、21.51%和22.71%，排放總量比對照組CK平均高86%。通過物料平衡分析，對照組比處理組損失量平均高出14%-26%，與前期CH4、CO2排放量大致吻合。隨著木醋液濃度增加，碳損失量降低，到堆肥后期，碳損失量比對照組平均減少了34%，提高了堆肥產(chǎn)品中有機質(zhì)的含量。 （3）通過回歸分析發(fā)現(xiàn)，CO2與O2存在一元線性關系，CH4與O2存在二元線性關系。CH4的排放受氧體積分數(shù)影響很大，添加3.0%棉稈木醋液處理組在前期FAS大于其他處理組，與氧體積分數(shù)相對應，進一步說明3#有利于堆肥順利進行。CH4:CO2與溫度、總有機質(zhì)和總氮呈線性關系，與溫度和總有機質(zhì)呈正相關，與總氮呈負相關。
[Abstract]:In this study, cattle manure was used as composting material and sawdust was used as conditioning agent. Through static aerobic composting experiment, the effects of adding cotton stalk and wood vinegar on spatio-temporal characteristics of cow manure composting were investigated systematically. The effect of adding cotton stalk wood vinegar on greenhouse gas emission during cow manure composting was analyzed, and the mechanism of controlling greenhouse gas emission from cow manure composting by wood vinegar was discussed, and the temperature of compost was also discussed. Correlation of organic matter and total nitrogen with CH4:CO2. The main results are as follows: (1) by adding 3.0% cotton stalk vinegar, the temperature of the compost was increased by 5? 7 鈩

本文編號：2438525