艾比湖濕地邊緣帶典型植物群落光合與土壤呼吸特征研究
發(fā)布時間：2018-08-09 12:38
【摘要】：在陸地三大生態(tài)系統(tǒng)中,濕地生態(tài)系統(tǒng)具有較強的固碳功能,濕地的固碳能力與全球生態(tài)系統(tǒng)的平衡緊密相連。艾比湖濕地為我國西北干旱區(qū)面積較大的濕地之一,濕地邊緣帶具有豐富的植物資源,植物的光合作用能夠快速降低大氣中CO2濃度,對提高濕地碳循環(huán)能力具有重要的影響,因此對艾比湖濕地邊緣帶植物光合作用和土壤呼吸作用進行研究具有重要的理論和現(xiàn)實意義。本文以艾比湖濕地邊緣帶蘆葦、檉柳群落的光合速率與土壤呼吸速率為研究對象,采用LI-6400便攜式光合儀和LI-8100土壤呼吸儀,于2013年9月對蘆葦、檉柳兩類植物群落的光合速率及土壤呼吸速率進行測定。分析了兩植物光合速率和根部土壤呼吸速率日變化特征,并通過Pearson相關(guān)分析法和CATREG回歸分析法探討了兩類植物光合速率與環(huán)境因子、土壤呼吸速率與環(huán)境因子以及植物光合速率與根部土壤呼吸的關(guān)系,確立植物光合速率、土壤呼吸速率與環(huán)境因子以及植物與土壤碳庫對濕地碳庫的影響機制,對定性評價艾比湖濕地的生態(tài)服務(wù)價值提供理論依據(jù),研究結(jié)果如下:(1)兩類植物的光合速率日變化特征均表現(xiàn)出雙峰曲線變化趨勢,兩類植物的兩次峰值出現(xiàn)時間接近一致,首次出現(xiàn)時間為11:00,第二次峰值出現(xiàn)時間為13:00。兩類植物的光合速率峰值范圍存在一定的差異,蘆葦光合速率首次峰值第二次峰值,檉柳光合速率首次峰值第二次峰值,兩類植物之間光合速率大小也存在不同。(2)兩類植物群落下土壤呼吸速率日變化特征表現(xiàn)不同。蘆葦群落土壤呼吸速率變化特征表現(xiàn)為弱雙峰曲線,檉柳群落土壤呼吸速率表現(xiàn)為單峰曲線。土壤呼吸速率峰值與蘆葦光合速率峰值出現(xiàn)時間相比較,兩次均推后約1小時,光合速率與土壤呼吸速率不具同步性。(3)植物光合速率與環(huán)境因子的相關(guān)分析表明,影響植物光合速率發(fā)生變化的因子種類眾多,其中太陽輻射、大氣CO2濃度、大氣相對濕度、溫度、蒸騰速率對植物的光合速率影響存在一定的差異,各類因子之間相互作用共同形成影響植物光合速率的體系。各類因子與蘆葦、檉柳光合速率的相關(guān)性存在顯著差異。蘆葦光合速率與蒸騰速率、空氣相對濕度、太陽輻射之間相關(guān)性較高,與溫度和CO2濃度相關(guān)性不顯著;檉柳光合速率與太陽輻射呈極顯著正相關(guān),與CO2濃度呈負相關(guān),與蒸騰速率、溫度變化相關(guān)性不顯著,與空氣相對濕度弱相關(guān)。(4)土壤呼吸速率與環(huán)境因子的相關(guān)分析說明,0~5cm土層溫度和濕度與蘆葦群落下土壤的呼吸速率具有顯著的相關(guān)性。0~5cm土層濕度和近地面大氣CO2濃度與檉柳群落下土壤的呼吸速率具有顯著相關(guān)性。兩類植物群落下土壤呼吸速率與環(huán)境因子的相關(guān)性二者之間存在一定的差異。(5)植物光合速率與土壤呼吸速率相互影響,檉柳群落的光合速率與根部土壤呼吸速率具有顯著相關(guān)性,蘆葦群落的光合速率與根部土壤呼吸速率相關(guān)性較弱。
[Abstract]:In the three major terrestrial ecosystems, the wetland ecosystem has a strong carbon sequestration function, and the carbon sequestration capacity of the wetland is closely connected with the balance of the global ecosystem. The wetland is one of the larger wetlands in the arid area of Northwest China. The edge of the wetland has a rich plant resources, and the photosynthesis of the plant can rapidly reduce the atmosphere. The concentration of CO2 has an important influence on improving the carbon cycling ability of wetland. Therefore, it is of great theoretical and practical significance to study the photosynthesis and soil respiration of the wetland edge zone of the Ebinur Lake. In this paper, the photosynthetic rate and soil respiration rate of the reed and Tamarix communities in the wetland of Ebinur Lake are studied by LI-640. The photosynthetic rate and soil respiration rate of two plant communities of reed and Tamarix were measured in September 2013 by 0 portable photosynthetic apparatus and LI-8100 soil breathing apparatus. The photosynthetic rate of two plants and the daily changes of soil respiration rate in root were analyzed. The photosynthesis of two types of plants was discussed by Pearson correlation analysis and CATREG regression analysis. The relationship between rate and environmental factors, soil respiration rate and environmental factors, plant photosynthesis rate and root soil respiration, and the mechanism of plant photosynthesis rate, soil respiration rate and environmental factors and the influence mechanism of plant and soil carbon pool on wetland carbon pool, provide a theoretical basis for qualitative evaluation of ecological service value of Ebei Lake wetland. The results are as follows: (1) the diurnal variation characteristics of photosynthetic rate of the two types of plants all show the trend of the Shuangfeng curve, the two peak peak time of the two plants is close to the same time, the first time is 11:00, the second peak time is a certain difference in the range of photosynthetic rate peak value of the 13:00. two plants, and the photosynthetic rate of reed is the first time. The peak second peak value, the first peak value of the photosynthesis rate of Tamarix, and the photosynthetic rate between two kinds of plants are different. (2) the diurnal variation characteristics of soil respiration rate under the two plant communities are different. The soil respiration rate of the reed community is characterized by the weak Shuangfeng curve, and the soil respiration rate of the Tamarix community is single. Peak curve. The peak of soil respiration rate was compared with the peak time of photosynthetic rate of reed. The two times were about 1 hours, and the photosynthetic rate was not synchronized with the soil respiration rate. (3) the correlation analysis between photosynthetic rate and environmental factors showed that there were many factors affecting the photosynthetic rate of plants, including solar radiation and atmosphere. The effects of CO2 concentration, atmospheric relative humidity, temperature and transpiration rate on the photosynthetic rate of plants were different. The interaction of various factors together formed a system to influence the photosynthetic rate of plants. The correlation of various factors with the rate of reed and Tamarix Liu Guanghe was significantly different. Reed photosynthesis rate and transpiration rate, relative humidity of air. The correlation between the solar radiation and the temperature and the CO2 concentration was not significant. The photosynthesis rate of Tamarix was significantly positively correlated with the solar radiation, and was negatively correlated with the concentration of CO2. The correlation with the transpiration rate, the temperature change was not significant, and the relative humidity of the air was weak. (4) the correlation analysis of soil respiration rate and environmental factors explained that 0~5cm soil was the correlation of soil respiration rate and environmental factors. There is a significant correlation between the layer temperature and the humidity and the respiration rate of soil under the reed community. The.0~5cm soil moisture and the CO2 concentration in the near ground atmosphere have significant correlation with the respiration rate of the soil under the Tamarix colony. There is a certain difference between the soil respiration rate and the environmental factors under the two plant communities. (5) plant light The photosynthetic rate of the Tamarix community has a significant correlation with the soil respiration rate in the root, and the photosynthetic rate of the reed community has a weak correlation with the soil respiration rate in the root.
【學(xué)位授予單位】：新疆師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：Q945.11;S154
本文編號：2174097
[Abstract]:In the three major terrestrial ecosystems, the wetland ecosystem has a strong carbon sequestration function, and the carbon sequestration capacity of the wetland is closely connected with the balance of the global ecosystem. The wetland is one of the larger wetlands in the arid area of Northwest China. The edge of the wetland has a rich plant resources, and the photosynthesis of the plant can rapidly reduce the atmosphere. The concentration of CO2 has an important influence on improving the carbon cycling ability of wetland. Therefore, it is of great theoretical and practical significance to study the photosynthesis and soil respiration of the wetland edge zone of the Ebinur Lake. In this paper, the photosynthetic rate and soil respiration rate of the reed and Tamarix communities in the wetland of Ebinur Lake are studied by LI-640. The photosynthetic rate and soil respiration rate of two plant communities of reed and Tamarix were measured in September 2013 by 0 portable photosynthetic apparatus and LI-8100 soil breathing apparatus. The photosynthetic rate of two plants and the daily changes of soil respiration rate in root were analyzed. The photosynthesis of two types of plants was discussed by Pearson correlation analysis and CATREG regression analysis. The relationship between rate and environmental factors, soil respiration rate and environmental factors, plant photosynthesis rate and root soil respiration, and the mechanism of plant photosynthesis rate, soil respiration rate and environmental factors and the influence mechanism of plant and soil carbon pool on wetland carbon pool, provide a theoretical basis for qualitative evaluation of ecological service value of Ebei Lake wetland. The results are as follows: (1) the diurnal variation characteristics of photosynthetic rate of the two types of plants all show the trend of the Shuangfeng curve, the two peak peak time of the two plants is close to the same time, the first time is 11:00, the second peak time is a certain difference in the range of photosynthetic rate peak value of the 13:00. two plants, and the photosynthetic rate of reed is the first time. The peak second peak value, the first peak value of the photosynthesis rate of Tamarix, and the photosynthetic rate between two kinds of plants are different. (2) the diurnal variation characteristics of soil respiration rate under the two plant communities are different. The soil respiration rate of the reed community is characterized by the weak Shuangfeng curve, and the soil respiration rate of the Tamarix community is single. Peak curve. The peak of soil respiration rate was compared with the peak time of photosynthetic rate of reed. The two times were about 1 hours, and the photosynthetic rate was not synchronized with the soil respiration rate. (3) the correlation analysis between photosynthetic rate and environmental factors showed that there were many factors affecting the photosynthetic rate of plants, including solar radiation and atmosphere. The effects of CO2 concentration, atmospheric relative humidity, temperature and transpiration rate on the photosynthetic rate of plants were different. The interaction of various factors together formed a system to influence the photosynthetic rate of plants. The correlation of various factors with the rate of reed and Tamarix Liu Guanghe was significantly different. Reed photosynthesis rate and transpiration rate, relative humidity of air. The correlation between the solar radiation and the temperature and the CO2 concentration was not significant. The photosynthesis rate of Tamarix was significantly positively correlated with the solar radiation, and was negatively correlated with the concentration of CO2. The correlation with the transpiration rate, the temperature change was not significant, and the relative humidity of the air was weak. (4) the correlation analysis of soil respiration rate and environmental factors explained that 0~5cm soil was the correlation of soil respiration rate and environmental factors. There is a significant correlation between the layer temperature and the humidity and the respiration rate of soil under the reed community. The.0~5cm soil moisture and the CO2 concentration in the near ground atmosphere have significant correlation with the respiration rate of the soil under the Tamarix colony. There is a certain difference between the soil respiration rate and the environmental factors under the two plant communities. (5) plant light The photosynthetic rate of the Tamarix community has a significant correlation with the soil respiration rate in the root, and the photosynthetic rate of the reed community has a weak correlation with the soil respiration rate in the root.
【學(xué)位授予單位】：新疆師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：Q945.11;S154
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