Pedogenesis, permafrost, and soil moisture as controlling factors for soil nitrogen and carbon contents across the Tibetan Plateau

We investigated the main parameters [e.g. mean annual air temperature , mean annual soil temperature, mean annual precipitation, soil moisture (SM), soil chemistry, and physics] influencing soil organic carbon (C(org)), soil total nitrogen (N(t)) as well as plant available nitrogen (N(min)) at 47 si...

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Bibliographic Details
Published in:Global Change Biology
Main Authors: Baumann, Frank, He, Jin-Sheng, Schmidt, Karsten, Kuehn, Peter, Scholten, Thomas
Other Authors: Baumann, F (reprint author), Univ Tubingen, Chair Phys Geog, Inst Geog, Rumelinstr 19-23, D-72070 Tubingen, Germany., Univ Tubingen, Chair Phys Geog, Inst Geog, D-72070 Tubingen, Germany., Peking Univ, Coll Urban & Environm Sci, Dept Ecol, Beijing 100871, Peoples R China., Univ Tubingen, Chair Phys Geog, Inst Geog, Rumelinstr 19-23, D-72070 Tubingen, Germany.
Format: Journal/Newspaper
Language:English
Published: 全球变化生物学 2009
Subjects:
Alpine grassland
global warming
pedogenesis
permafrost degradation
plant available nitrogen
Qinghai-Tibetan Plateau
soil moisture
soil nitrogen
soil organic carbon
soil texture
ORGANIC-CARBON
DIOXIDE EMISSIONS
CLIMATE-CHANGE
ALPINE MEADOW
TEMPERATURE
CHINA
ECOSYSTEM
STORAGE
MINERALIZATION
DECOMPOSITION
permafrost
Online Access:https://hdl.handle.net/20.500.11897/245025
https://doi.org/10.1111/j.1365-2486.2009.01953.x
Description
Summary:We investigated the main parameters [e.g. mean annual air temperature , mean annual soil temperature, mean annual precipitation, soil moisture (SM), soil chemistry, and physics] influencing soil organic carbon (C(org)), soil total nitrogen (N(t)) as well as plant available nitrogen (N(min)) at 47 sites along a 1200 km transect across the high-altitude and low-latitude permafrost region of the central-eastern Tibetan Plateau. This large-scale survey allows testing the hypothesis that beside commonly used ecological variables, diversity of pedogenesis is another major component for assessing carbon (C) and nitrogen (N) cycling. The aim of the presented research was to evaluate consequences of permafrost degradation for C and N stocks and hence nutrient supply for plants, as the transect covers all types of permafrost including heavily degraded areas and regions without permafrost. Our results show that SM is the dominant parameter explaining 64% of C(org) and 60% of N variation. The extent of the effect of SM is determined by permafrost, current aeolian sedimentation occurring mostly on degraded sites, and pedogenesis. Thus, the explanatory power for C and N concentrations is significantly improved by adding CaCO(3) content (P=0.012 for C(org); P=0.006 for N(t)) and soil texture (P=0.077 for C(org); P=0.015 for N(t)) to the model. For soil temperature, no correlations were detected indicating that in high-altitude grassland ecosystems influenced by permafrost, SM overrides soil temperature as the main driving parameter at landscape scale. It was concluded from the current study that degradation of permafrost and corresponding changes in soil hydrology combined with a shift from mature stages of pedogenesis to initial stages, have severe impact on soil C and plant available N. This may alter biodiversity patterns as well as the development and functioning of the ecosystems on the Tibetan Plateau. Biodiversity Conservation Ecology Environmental Sciences SCI(E) 32 ARTICLE 12 3001-3017 15

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