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

台湾的高降水率可能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影响。在这里，我们检验了一个假设，即在异常高的凋落物投入后，由于凋落物的快速分解和相关的养分释放，土壤溶液的养分损失显著增加。此外，我们将量化分解过程中溶解有机物对总质量损失的作用。为了验证这一假设，我们将实验控制暖温带山地森林（台湾Chamaecyparis obutse var. formosana和台湾Chamaecyparis formosensis）凋落物的数量。土壤溶液化学将在不同深度持续研究。将计算控制区和操纵区土壤溶液中的元素通量。利用垃圾袋进行分解研究，研究凋落物的分解动态和养分释放。垃圾袋研究和土壤溶液通量的结果将与元素预算相结合，这将有助于深入了解这些生态系统的生物地球化学，并指出台风事件的关键影响。

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.