【摘要】：本研究以鄱陽湖南磯山濕地和吳城常湖池濕地為研究區(qū)域,分析不同水位時(shí)期(平水期、枯水期和豐水期)、不同群落(裸灘、茭白、苔草、南荻、蘆葦)的土壤碳、氮和活性有機(jī)質(zhì)含量時(shí)空分布特征、土壤理化性質(zhì)與影響因子,并利用傅立葉紅外光譜技術(shù)對(duì)不同地點(diǎn)、植被群落演替、不同水位時(shí)期下濕地土壤有機(jī)質(zhì)的結(jié)構(gòu)進(jìn)行分析。主要結(jié)果如下:(1)不同地點(diǎn)、不同群落演替、水位土壤理化性質(zhì)不同。不同地點(diǎn)下土壤理化性質(zhì)差別不大,其中南磯山濕地的含水量較高為58.21%。不同群落演替下茭白土壤的含水量最高為130.89%,其溫度和pH最低分別為8.60℃、4.72,南荻土壤的溫度最高為17.67℃,蘆葦?shù)暮孔畹蜑?7.94%,裸灘的pH最高為6.76。整體而言,不同水位時(shí)期下的溫度表現(xiàn)為豐水期平水期枯水期;pH表現(xiàn)為枯水期豐水期平水期;含水量表現(xiàn)為平水期豐水期枯水期。(2)不同地點(diǎn)、群落演替、水位土壤碳、氮和活性有機(jī)質(zhì)含量不同。不同地點(diǎn)土壤碳、氮含量無明顯差異,兩地的裸灘土壤活性有機(jī)質(zhì)含量差異顯著(p0.05)。不同群落演替土壤碳氮和活性有機(jī)質(zhì)含量皆為茭白群落最高,分別為23.21 mg/g、2.19 mg/g、7.27 mg/g,與其他群落均有顯著差異(p0.05)。不同水位下總碳、總氮含量差異顯著,具體表現(xiàn)為平水期枯水期豐水期,總體而言,平、枯水期比豐水期時(shí)土壤活性有機(jī)質(zhì)含量高。土壤碳、氮和活性有機(jī)質(zhì)含量與pH值均呈顯著負(fù)相關(guān)(p0.01),與溫度均呈顯著負(fù)相關(guān)(p0.05),和土壤的含水量均呈顯著正相關(guān)(p0.01),土壤活性有機(jī)質(zhì)與土壤總碳、總氮含量呈顯著正相關(guān)(p0.01)。(3)各群落下的土壤紅外光譜譜型基本相似,在植被群落演替下的土壤有機(jī)質(zhì)在某些特征峰的強(qiáng)度上有著不同的差異。整體而言,植被土壤有機(jī)質(zhì)在不同水位時(shí)期均表現(xiàn)出茭白土壤中紅外光譜特征峰峰值較小,裸灘土壤中紅外光譜特征峰峰值較大。不同群落演替下的土壤的紅外主要峰值在3696 cm~(-1)、3622cm~(-1)、3422 cm~(-1)、2920 cm~(-1)、2840 cm~(-1)、1633 cm~(-1)、1380 cm~(-1)、1033 cm~(-1)、913cm~(-1)、798 cm~(-1)、780 cm~(-1)、694 cm~(-1)處,說明植被群落演替土壤有機(jī)質(zhì)中含有羥基、芳香結(jié)構(gòu)的C=C或者酰胺鍵、脂肪亞甲基、木質(zhì)素與脂肪族化合物、粘土類礦物硅質(zhì)、烯烴。(4)相同植被在鄱陽湖南磯山濕地不同水位時(shí)期的中紅外光譜譜圖大致相同,峰值強(qiáng)弱有所差異,整體而言,豐水期的土壤有機(jī)質(zhì)的各個(gè)特征峰峰值較小,而平水期時(shí)各植被土壤有機(jī)質(zhì)的特征峰峰值較大。不同地點(diǎn)下土壤有機(jī)質(zhì)組成和結(jié)構(gòu)上有所差異,南磯山濕地土壤二階譜圖在539 cm~(-1)、479 cm~(-1)處附近的峰普遍比吳城的強(qiáng),南磯山濕地土壤中含有粘土類硅化物含量比吳城多。
[Abstract]:Taking Nanji Mountain Wetland of Poyang Lake and Changhu Lake Wetland of Wucheng as the study area, the soil carbon of different water level periods (plain, dry and abundant) and different communities (bare beach, Zizania latifolia, Carex sinensis, South Amur, Reed) were analyzed. The spatial and temporal distribution characteristics of nitrogen and active organic matter contents, soil physicochemical properties and influencing factors were analyzed by Fourier transform infrared spectroscopy (FTIR). The structure of soil organic matter in different sites, vegetation community succession and different water level periods were analyzed by Fourier transform infrared spectroscopy (FTIR). The main results are as follows: (1) the physical and chemical properties of water level soil are different in different sites, different community succession and water level. The physical and chemical properties of soil were not different in different sites, and the water content of Nanji Mountain wetland was higher than that of Nanji Mountain wetland. The highest water content of Zizania latifolia was 130.89, the lowest temperature and pH were 8.60 鈩，

本文編號(hào)：2350903