Abstract：
Despite its small share of total forest biomass, ground vegetation plays an important role in biogeochemical cycles, being able to modify carbon (C) and nutrients fluxes. Global climate warming may affect plant nutrient uptake and the carbon:nitrogen:phosphorus (C:N:P) stoichiometry, the release of nutrients from the soil and soil organic matter, as well as significantly influence the tree stand nutrient supply. In this context, the response of Norway spruce (Picea abies (L.) H.Karst) stands\' ground vegetation to warming is uncertain. An open-top chamber soil-warming simulation, lasting two growing seasons, was conducted in a spruce forest. At the end of each of the two growing seasons, before leaf senescence, European blueberry (Vaccinium myrtillus L.) aboveground biomass (leaves and stems) and mineral topsoil samples were collected from the plots. The C, N, P, micronutrient, and macronutrient concentrations were estimated in the samples. Warming caused significant decreases in C, N, and P in the soil. Warming also decreased the C:P and N:P stoichiometric ratios in the soil and increased the C:P ratio in plant stems. Significant increase in foliar C and decrease in foliar P in warmed plots were observed. The most evident effect was reduction of N and P in the soil, which directly affected the plant C:P and soil N:P stoichiometry. Our results show that warming has caused a significant decrease in the content of some nutrients in the aboveground plant tissues of blueberries. Given that N is a limiting factor of ecosystems productivity, its reduction in the soil caused by warming may be a serious threat to proper nutrient uptake and cause disruption of biogeochemical cycles. The decrease in nutrient content in aboveground tissues due to warming can result in disruptions to physiological processes.
摘要：
尽管其在森林总生物量中所占份额很小，地面植被在生物地球化学循环中起着重要作用，能够改变碳(C)和养分通量。全球气候变暖可能会影响植物养分吸收和碳：氮：磷（C：N：P）化学计量，从土壤和土壤有机质中释放养分，以及显著影响林木养分供给。在这种情况下，挪威云杉(云杉(L.)H.喀斯特)地面植被对变暖的影响不确定。开放式室内土壤增温模拟，持续两个生长季节，是在云杉林里进行的.在两个生长季节的每一个结束时，在叶片衰老之前，从地块中收集了欧洲蓝莓（VaceminiummyrtillusL.）地上生物量（叶和茎）和矿物表土样品。C,N,P,微量营养素,和样品中的常量营养素浓度进行了估计。变暖导致C显着下降，N,和土壤中的P。变暖还降低了土壤中的C：P和N：P化学计量比，并增加了植物茎中的C：P比。在温暖的地块中观察到叶面C的显着增加和叶面P的减少。最明显的效果是减少土壤中的N和P，直接影响植物C:P和土壤N:P的化学计量。我们的结果表明，变暖导致蓝莓地上植物组织中某些营养素的含量显着下降。考虑到N是生态系统生产力的限制因素，由于变暖而导致的土壤减少可能对适当的养分吸收构成严重威胁，并导致生物地球化学循环中断。由于变暖而导致的地上组织中营养素含量的减少可导致生理过程的破坏。
