Changes and Future Prediction in the Dynamics of Dissolved Organic Matter in Soils under Forest Ecosystems by Global Warming

全球变暖导致森林生态系统土壤溶解有机物动态变化及未来预测

• 批准号: 15310005
• 负责人: HIGASHI Teruo
• 金额: $ 6.72万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15310005/
• 关键词: global warming; dissolved organic matter in soils (DOM); Humus laver (O horizon); forest ecosystem; soil temperature and moisture; chemical composition of DOM; DOC concentration of leaching solution from soils; 土壌圏溶存有機物; 土壌呼吸量; 土壌バイオマス量; global warming; dissolved organic matter in soils (DOM); Humus laver (O horizon); forest ecosystem; soil temperature and moisture; chemical composition of DOM; DOC concentration of leaching solution from soils; 土壌圏溶存有機物; 土壌呼吸量; 土壌バイオマス量

In order to investigate the changes and future prediction in the dynamics of dissolved organic matter (DOM) in the O horizon of soils under forest ecosystem due to global warming and temperature increase, DOM after an incubation experiments of O horizon samples under different temperatures for 80days extracted with water and also the DOM in the leaching solution from O horizon under the "Warming Chamber" made of plastics of acryl resins were subjected to the various analyses, especially their chemical composition.Two representative study sites were selected, one was the Kawakami Experimental Station of Forestry, University of Tsukuba where a typical cool temperate forest ecosystems composed of mainly broad-leaved trees (Qerccus Mongolia spp.) growing on an acid brown forest soils (Dystric Cambisols), and the other was the Oodarumi National Forest where a typical sub-frigid forest ecosystems composed of mainly needle-leaved trees (Abies spp.) growing on a podzolic soils (Typic Podzols). … More The simulated experiment for the "Warming Chamber" was conducted during the period from 2003 to 2005 except for winter times. The results obtained were as follows.1)Concentration of dissolved organic carbon (DOC) in the extracts of O horizon sample increased after the incubation for 80days, especially for the samples under 15℃. The proportion of hydrophilic components of DOM also increased after the incubation as well as extracted cations including calcium, magnesium, potassium, sodium, aluminum and iron. The changes in the chemical structure were inferred from the absorbance at 285nm per DOC,IR spectra and elemental compositions, suggesting the increase in the aromatic carbon with lower "saturation degree".2)DOC concentration in the leaching solutions increased for the sites under simulated "Warming Chamber" where about 0.5℃ increase in the mean day temperature was observed in the O horizon, suggesting that the higher decomposition rate would be plausible as detected by the measurement of soil respiration rate for the elevated temperature conditions resulting in the release of more aromatic components of DOM. However the increase in the proportion of hydrophilic components of DOM was not clearly detected in the field conditions. Moreover changes of soil properties were observed especially for those in the surface horizons.3)The increase in temperature, possibly global warming, increase the amount of DOM of aromatic carbon with lower "saturation degree" like phenol and fulvic acids-like substances, and lead to the changes in the properties of soils of surface horizons.From the comparative study on the two study sites mentioned above it is suggested that the effect of global warming on the amounts and the composition of DOM would be more apparent in the areas under the forest ecosystems of cooler climate. Thus the fundamental knowledge on the dynamics of DOM from forest ecosystems under prevailing global warming was obtained through this project. Less

为了调查在森林生态系统下溶解有机物（DOM）在森林生态系统下的溶解有机物动力学（DOM）的变化和未来预测，这是由于全球生态系统的变化和温度的升高，DOM在80天的不同温度下进行了80天的O地平线样品的孵育实验，并用水中提取的DOM在o上均采用了“高度分析”的跨度分析，尤其是ACRISES的ACRY批次分析。 composition.Two representative study sites were selected, one was the Kawakami Experimental Station of Forestry, University of Tsukuba where a typical cool temperature forest ecosystems composed of mainly broad-leaved trees (Qercus Mongolia spp.) growing on an acid brown forest soils (Dystric Cambisols), and the other was the Oodarumi National Forest where a typical sub-frigid forest ecosystems主要由生长在Podzolic土壤（典型的podzols）上的针叶树（Abies spp。）组成。 ...更多的“变暖室”的模拟实验是在2003年至2005年期间进行的。所获得的结果如下。1）在孵育80天后，在O地平线样品提取物中溶解有机碳（DOC）的浓度增加了，尤其是对于15℃以下的样品。温育后，DOM的亲水性成分的比例也增加，以及提取的阳离子，包括钙，镁，钾，钠，铝和铁。化学结构的变化是从每个文档，IR光谱和元素组成的285nm的吸收中推断出来的，表明“饱和度”较低的芳族碳的增加。2）在步行解决方案中，模拟的“变暖室”中的步行解决方案的浓度增加了，因为在o上的平均温度在较高的情况下会在较高的情况下增加，而较高的速度则是在o上的较高的速度，而越来越多的率在o上的速度上升了，这是在o上的率高，而pla则是在o上的率，而在o上的速度却增加了。升高温度条件的土壤呼吸速率导致DOM的更芳香族成分释放。但是，在现场条件下未清楚地检测到DOM的亲水性成分比例的增加。此外，观察到土壤特性的变化，尤其是对于地表范围的人。3）温度的升高，可能的全球变暖，增加芳香碳的dom量，具有较低的“饱和度”（如苯酚和富醇酸），类似苯酚和富维酸的物质，并导致表面水平的属性的变化。在上面提出的两种构成量的构成效果以及对全球范围的构成效果，以及构成的效果，该量的构成的效果是构成的效果。在凉爽气候的森林生态系统下的地区显而易见。通过该项目获得了有关森林生态系统中DOM的动态的基本知识。较少的