期刊
BIOGEOCHEMISTRY
卷 158, 期 1, 页码 39-72出版社
SPRINGER
DOI: 10.1007/s10533-021-00884-7
关键词
Calcareous soils; Ecosystem nutrition; Soil P forms; Pedogenesis; Bedrock impurity; P acquiring; P recycling
资金
- Projekt DEAL
- German Research Foundation (DFG) [LA 1398/13, AM 134/18, BA 2821-13, KA 1590/12, KA 1673/9, PR 534/6, SI 1106/8-2, DI 2136/6, KU 1184/38-2]
- Swiss National Foundation (SNF) [200021E-171170/171172, SS 200021E-171173]
- Swiss National Science Foundation (SNF) [200021E-171173, 200021E-171170] Funding Source: Swiss National Science Foundation (SNF)
Understanding ecosystem phosphorus (P) cycling is crucial for sustainable forest management. This study extends the assessment of P nutrition strategies to forest sites with carbonate bedrock, presenting comprehensive data on soil and bedrock chemistry. It introduces the concept of an Ecosystem P Nutrition Index (ENIp) for comparing P nutrition strategies among different forest sites.
Sustainable forest management requires understanding of ecosystem phosphorus (P) cycling. Lang et al. (2017) [Biogeochetnistry, https://doi.org/ 10.1007/s10533-017-0375-0] introduced the concept of P-acquiring vs. P-recycling nutrition strategies for European beech (Fagus sylvatica L.) forests on silicate parent material, and demonstrated a change from P-acquiring to P-recycling nutrition from P-rich to P-poor sites. The present study extends this silicate rock-based assessment to forest sites with soils formed from carbonate bedrock. For all sites, it presents a large set of general soil and bedrock chemistry data. It thoroughly describes the soil P status and generates a comprehensive concept on forest ecosystem P nutrition covering the majority of Central European forest soils. For this purpose, an Ecosystem P Nutrition Index (ENIp) was developed, which enabled the comparison of forest P nutrition strategies at the carbonate sites in our study among each other and also with those of the silicate sites investigated by Lang et al. (2017). The P status of forest soils on carbonate substrates was characterized by low soil P stocks and a large fraction of organic Ca-bound P (probably largely Ca phytate) during early stages of pedogenesis. Soil P stocks, particularly those in the mineral soil and of inorganic P forms, including Al- and Fe-bound P, became more abundant with progressing pedogenesis and accumulation of carbonate rock dissolution residue. Phosphorus-rich impure, silicate-enriched carbonate bedrock promoted the accumulation of dissolution residue and supported larger soil P stocks, mainly bound to Fe and Al minerals. In carbonate-derived soils, only low P amounts were bioavailable during early stages of pedogenesis, and, similar to P-poor silicate sites, P nutrition of beech forests depended on tight (re)cycling of P bound in forest floor soil organic matter (SOM). In contrast to P-poor silicate sites, where the ecosystem P nutrition strategy is direct biotic recycling of SOM-bound organic P, recycling during early stages of pedogenesis on carbonate substrates also involves the dissolution of stable Ca-P org precipitates formed from phosphate released during SOM decomposition. In contrast to silicate sites, progressing pedogenesis and accumulation of P-enriched carbonate bedrock dissolution residue at the carbonate sites promote again P-acquiring mechanisms for ecosystem P nutrition.
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