Carbon pools in spruce forests of the Qilian Mountains (north-eastern Tibetan Plateau under the influence of global warming and land use

以青藏高原东北部面积最大的森林群落青海云杉（Piceacrassifolia）为研究对象，分析了其在森林放牧和采伐过程中所经历的不同退化阶段的总碳储量。对地上不同部分（树木、灌木、枯木、草本层）和地下生物量（活的和死的细根）以及土壤有机碳的碳库进行了估计。过去的作用和未来的前景的云杉林储存碳和固碳干木材生长的影响下，全球变暖的树木年轮分析的帮助下，这也提供了信息的时间趋势，木材形成和森林再生的评估。气候相关趋势与土地利用的响应是通过以下方式分离的：（1）在分析中包括土地利用压力低的林分;（2）将树轮宽度与仪器气候数据相关联;（3）分析单个树轮系列的δ 13 C和δ 18 O特征。

Mountain forests of spruce (Picea crassifolia), the forest community with largest extension on the north-eastern Tibetan Plateau, and their degradation stages resulting from forest pasture and logging are analyzed for their total carbon stocks. Estimates of the carbon pools are made for different fractions of the above-ground (trees, shrubs, deadwood, herbal layer) and below-ground biomass (living and dead fine roots) as well as for the soil organic carbon. The past role and future perspectives of the spruce forests to store carbon and to sequester carbon by stem wood growth under the influence of global warming are assessed with the help of tree-ring analyses, which also provide information on temporal trends in wood formation and forest regeneration. Climate-related trends are separated from responses to land use by (1) including stands with low land-use pressure in the analyses, (2) correlating tree-ring widths with instrumental climate data, and (3) the analysis of δ13C and δ18O signatures of individual tree-ring series.