Effect of climate on coarse woody debris decay dynamics and incorporation into the soils of forested Alpine areas (DecAlp)

该项目涉及粗糙的木质残体、高山森林土壤的腐烂过程、土壤生物、腐殖质形式及其与高山地区气候的关系（特伦蒂诺，海拔1000米至约2200米的气候序列，面向N和S的斜坡，天然针叶林）。计划的活动分为3个不同的“隔间”：粗木质残体（CWD）→腐殖质形态→土壤有机质（SOM）。我们有以下的研究问题：（一）气候如何影响粗木质腐烂以上，特别是在高山网站的土壤？(ii)什么时间尺度参与（CWD衰减作为气候的函数）？CWD融入SOM组分的速度有多快？CWD的衰变产物以何种方式稳定？(iii)腐解机制与腐殖质形态的空间分布之间有什么联系？(iv)腐殖质形态能否作为土壤生物区系空间外推的代表。

The project deals with coarse woody debris, decay processes in alpine forest soils, soil organisms, humus forms and their relation to climate in an Alpine area (Trentino, climosequences from 1000 m to about 2200 m asl, N- and S- facing slopes, natural coniferous forest). Planned activities are grouped among 3 different “compartments”: Coarse woody debris (CWD) → Humus forms → Soil organic matter (SOM). We have the following research questions: (i) How does climate affect coarse woody decay above and especially in the soil of alpine sites? (ii) What time scales are involved in (CWD decay as a function of climate)? How quickly is CWD integrated into SOM fractions? In which way are the decay products of CWD stabilised? (iii) What are the links between decay mechanisms and the spatial distribution of humus forms? (iv) Can the humus form serve as a proxy for the soil biota for the spatial extrapolation.