Department of Forest Ecology and Silviculture, Faculty of Forestry, University of Agriculture in Kraków, Al. 29 Listopada 46, 31-425 Kraków, Poland.
CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
Sci Total Environ. 2023 Oct 20;896:166396. doi: 10.1016/j.scitotenv.2023.166396. Epub 2023 Aug 18.
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.
尽管地面植被在森林生物量中所占比例很小，但它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对养分的吸收以及碳氮磷（C:N:P）化学计量比，从而影响土壤和土壤有机质中养分的释放，并显著影响林分的养分供应。在这种情况下，云杉（Picea abies (L.) H.Karst）林地面植被对变暖的反应是不确定的。在云杉林中进行了为期两个生长季节的开顶式土壤增温模拟。在每个生长季节结束时，在叶子衰老之前，从样地中采集了欧洲越桔（Vaccinium myrtillus L.）地上生物量（叶片和茎）和矿质表土样本。对样本中的 C、N、P、微量元素和大量元素浓度进行了估计。增温导致土壤中 C、N 和 P 显著减少。增温还降低了土壤中的 C:P 和 N:P 化学计量比，并增加了植物茎中的 C:P 比。在变暖的样地中，叶片中的 C 显著增加，而叶片中的 P 减少。最明显的影响是土壤中 N 和 P 的减少，这直接影响了植物的 C:P 和土壤的 N:P 化学计量比。我们的研究结果表明，增温导致蓝莓地上植物组织中一些养分含量显著下降。鉴于 N 是生态系统生产力的限制因素，增温导致土壤中 N 的减少可能对适当的养分吸收构成严重威胁，并可能破坏生物地球化学循环。由于增温导致地上组织中养分含量减少，可能会导致生理过程中断。
