本文選題：泥炭 + 土壤水分特征曲線　； 參考：《東北師范大學(xué)》2017年碩士論文

【摘要】：水分特征曲線是研究土壤水力特性的重要參數(shù),是反映土壤持水能力和滯后能力的重要依據(jù)。研究泥炭水分特征曲線及影響因素,有助于深入理解水分對泥炭地的碳累積的影響機(jī)理。本文通過野外采樣、室內(nèi)實驗,初步研究了自然狀態(tài)泥炭的草本泥炭(金川)和開采泥炭地(遼源)的草本泥炭的水分特征曲線的變化規(guī)律,分析了泥炭水分特征曲線的影響因素,建立了水勢與泥炭CO2釋放速率的函數(shù)關(guān)系,主要研究結(jié)果如下:1.用Gardner公式對金川草本泥炭和遼源草本泥炭水分特征曲線的擬合效果良好,擬合系數(shù)在0.90-0.99之間。隨含水量的升高,泥炭水勢都呈現(xiàn)出快速下降-緩慢下降-基本平穩(wěn)的變化趨勢。金川草本泥炭的水分特征曲線吸濕過程曲線參數(shù)在0.2583-0.328之間,脫濕過程曲線參數(shù)在0.4291-0.5205之間;遼源泥炭的水分特征曲線吸濕過程曲線參數(shù)在0.4134-0.4823之間,脫濕過程曲線參數(shù)在0.7175-0.8983之間。泥炭水分特征曲線說明泥炭具有易吸水難失水的特點,遼源草本泥炭的吸水能力和持水能力強(qiáng)于金川草本泥炭。2.金川草本泥炭和遼源草本泥炭均存在水分滯后現(xiàn)象,金川草本泥炭的水分特征曲線滯后參數(shù)在0.0326-0.0427之間,遼源草本泥炭的水分特征曲線滯后參數(shù)在0.0657-0.0848之間,遼源草本泥炭的水分滯后特征比金川草本泥炭的水分滯后特征更加明顯,其中遼源表層泥炭的水分滯后特征比中層和底層的明顯。3.泥炭的容重、毛管孔隙度、總孔隙度、纖維含量是影響泥炭水分特征曲線和水分滯后能力的關(guān)鍵因素,纖維素含量、半纖維素含量、木質(zhì)素含量與泥炭水分特征曲線以及滯后參數(shù)沒有明顯的相關(guān)性。4.水勢對泥炭CO2釋放速率的影響可以用冪函數(shù)來表示,系數(shù)在0.87-0.99之間,隨水勢的升高,草本泥炭采樣點的CO2釋放速率都呈現(xiàn)出快速下降-緩慢下降-基本平穩(wěn)的變化趨勢。
[Abstract]:The water characteristic curve is an important parameter to study the hydraulic characteristics of soil, and it is an important basis for reflecting the water holding capacity and lagging capacity of soil. The study of water characteristic curve and influencing factors of peat is helpful to understand the influence mechanism of moisture on carbon accumulation in peat soil. Based on field sampling and laboratory experiments, the variation law of water characteristic curve of natural peat (Jinchuan) and peat (Liaoyuan) was studied in this paper. The influencing factors of water characteristic curve of peat were analyzed, and the functional relationship between water potential and CO2 release rate of peat was established. The main results were as follows: 1. Gardner formula was used to fit the water characteristic curves of Jinchuan herbaceous peat and Liaoyuan herbaceous peat, and the fitting coefficient was between 0.90-0.99. With the increase of water content, the water potential of peat decreased rapidly, slowly and steadily. The moisture characteristic curve parameters of Jinchuan herbaceous peat were between 0.2583-0.328 and 0.4291-0.5205, and those of Liaoyuan peat and Liaoyuan peat were 0.4134-0.4823 and 0.7175-0.8983 respectively. The water characteristic curve of peat shows that peat is easy to absorb water and lose water, and the water absorption and water holding capacity of peat in Liaoyuan is stronger than that of Jinchuan herbaceous peat. 2. Both Jinchuan herbaceous peat and Liaoyuan herbaceous peat have water lag phenomenon. The hysteresis parameter of water characteristic curve of Jinchuan herbaceous peat is 0.0326-0.0427, and that of Liaoyuan herbaceous peat is 0.0657-0.0848. The moisture hysteresis characteristics of Liaoyuan herbaceous peat were more obvious than that of Jinchuan herbaceous peat, and the water lag characteristics of Liaoyuan surface peat were more obvious than those of middle layer and bottom layer. The bulk density, capillary porosity, total porosity and fiber content of peat are the key factors affecting water characteristic curve and moisture lag ability of peat, cellulose content, hemicellulose content, cellulose content, hemicellulose content, cellulose content, hemicellulose content, cellulose content, hemicellulose content, There was no significant correlation between lignin content and water characteristic curve and hysteresis parameters of peat. 4. The effect of water potential on the CO2 release rate of peat can be expressed by power function. The coefficient is between 0.87-0.99. With the increase of water potential, the CO2 release rate of herbaceous peat sampling points shows a tendency of fast decreasing, slowly decreasing and basically stable.
【學(xué)位授予單位】：東北師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：S152.7

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