Effects of high litterfall amounts on the transport of mineral elements and dissolved organic matter in the soil of a warm temperate montane forest exosystem in Taiwan

高凋落物量对台湾暖温带山地森林外系统土壤中矿质元素和溶解性有机物迁移的影响

• 批准号: 5397126
• 负责人: Professor Dr. Egbert Matzner
• 金额: --
• 依托单位: Department of Natural Resources and Environmental Studies
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2003
• 资助国家: 德国
• 起止时间: 2002-12-31 至 2005-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5397126?language=en
• 关键词: Effects; litterfall; amounts; transport; mineral

High precipitation rates in Taiwan may result in a high risk of nutrient and dissolved organic matter losses from forest eco- systems with soil solution transport. In addition, frequently occurring typhoons have a strong effect on the annual amounts of litterfall in this region. Here we test the hypothesis that nutrient losses with soil solution significantly increase after exceptionally high litterfall inputs due to the quick decomposition of litter and the associated nutrient release. Furthermore we will quantify the role of dissolved organic matter for the overall mass loss during decomposition. To test the hypothesis we will experimentally manipulate the amount of litterfall in a warm temperate montane forest (Chamaecyparis obutse var. formosana and Chamaecyparis formosensis). Soil solution chemistry will be investigated continuously in different depths. Element fluxes with soil solution will be calculated for control and manipulated plots. Decomposition studies with litterbags will be conducted to study decomposition dynamics and nutrient release from the litter. The results of litterbag studies and soil solution fluxes will be combined to elemental budgets which will give insight into the biogeochemistry of these ecosystems and indicate the key influence of typhoon events.

台湾地区的高降水率可能会导致森林生态系统中养分和溶解有机质随土壤溶液迁移而流失的高风险。此外，频繁发生的台风对该地区的年凋落物量有很大的影响。在这里，我们测试的假设，土壤溶液中的养分流失显着增加异常高的凋落物输入后，由于凋落物的快速分解和相关的养分释放。此外，我们将量化溶解有机物的作用，在分解过程中的整体质量损失。为了验证这一假设，我们将实验操纵凋落物的数量在暖温带山地森林（Chamaaparis obutse var。和Chamaparis formosensis）。将在不同深度连续调查土壤溶液化学。将计算对照地块和操作地块的土壤溶液元素通量。将使用垃圾袋进行分解研究，以研究分解动力学和凋落物的营养释放。垃圾袋研究和土壤溶液通量的结果将结合到元素收支，这将使这些生态系统的地球化学的洞察力，并指出台风事件的关键影响。