Litter tissue chemistry for three plant species from ambient or increased soil nutrient plots in moist acidic tundra in northern Alaska, 2010

We conducted a decomposition study in three fertilization experiments in moist acidic tussock (MAT) tundra near Toolik Lake, Alaska that differed in duration. This study was designed to better understand the trajectory of decomposition over time when soil nutrients are increased. Results will help us make better predictions about changes in element cycling associated with warming in the Arctic. We decomposed leaves from three plant species: Betula nana, Eriophorum vaginatum, and Rubus chamaemorus over a three year time period in both control (CT) and fertilized (NP) plots that had begun in 1989, 1996, or 2006. To quantify litter tissue chemistry, in August 2010 we collected leaves of these three species from plots with ambient soil nutrient availability and plots that had been fertilized since 2006. Leaves were dried and analyzed for percent (%) Carbon (C), %Nitrogen (N), cellulose, and lignin.

我们在阿拉斯加图利克湖附近的潮湿酸性草丘苔原（moist acidic tussock, MAT）开展了一项分解研究，涉及3项持续时长各异的施肥实验。本研究旨在深入解析土壤养分提升后，分解过程随时间推移的动态轨迹。研究结果将助力我们更精准地预测北极地区变暖驱动的元素循环变化。我们选取了3种植物的叶片——矮桦（Betula nana）、羊胡子草（Eriophorum vaginatum）与云莓（Rubus chamaemorus），在分别于1989年、1996年或2006年设立的对照（CT）与施氮磷（NP）样地中开展了为期三年的分解实验。为量化枯落物组织化学特征，我们于2010年8月从土壤养分处于自然背景水平的样地，以及2006年起开始施肥的样地中采集了上述3种植物的叶片。采集得到的叶片经干燥处理后，被用于测定其碳（C）、氮（N）百分含量，以及纤维素与木质素的含量。