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

该项目涉及高山地区(特伦蒂诺，气候序列从1000米到约2200米)的粗木质碎屑、高山森林土壤中的腐烂过程、土壤生物、腐殖质形态及其与气候的关系，以及面向N和S的斜坡，天然针叶林。计划的活动分为三个不同的“分类”：粗木质碎屑(CWD)→腐殖质形式→土壤有机质(SOM)。我们有以下研究问题：(I)气候如何影响高山遗址上方特别是土壤中的粗木质腐烂？(2)涉及哪些时间尺度(CWD随气候变化而衰减)？CWD集成到SOM部分的速度有多快？CWD的衰变产物是如何稳定的？(3)腐殖质形态的空间分布与腐殖质衰变机制之间有什么联系？(4)腐殖质形态能否代替土壤生物群进行空间外推。

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.