Journal ArticleDOI
Long‐term active restoration of extremely degraded alpine grassland accelerated turnover and increased stability of soil carbon
Yanfu Bai,Lina Ma,A. A. Degen,Muhammad Khalid Rafiq,Muhammad Khalid Rafiq,Yakov Kuzyakov,Yakov Kuzyakov,Zhao Jingxue,Rui Zhang,Tao Zhang,Wenyin Wang,Xiao Gang Li,Ruijun Long,Zhanhuan Shang,Zhanhuan Shang +14 more
TLDR
In conclusion, extremely degraded grassland needs proper long-term management in active restoration projects, especially for improvement of soil nutrients in a harsh environment.Abstract:
Soil nutrient contents and organic carbon (C) stability are key indicators for restoration of degraded grassland. However, the effects of long-term active restoration of extremely degraded grassland on soil parameters have been equivocal. The aims of this study were to evaluate the impact of active restoration of degraded alpine grassland on: (a) soil organic matter (SOM) mineralization; and (b) the importance of biotic factors for temperature sensitivity (Q(10)) of SOM mineralization. Soils were sampled from intact, degraded and restored alpine grasslands at altitudes ranging between 3,900 and 4,200 m on the Tibetan Plateau. The samples were incubated at 5, 15 and 25 degrees C, andQ(10)values of SOM mineralization were determined. Structural equation modeling was used to evaluate the importance of vegetation, soil physico-chemical properties and microbial parameters forQ(10)regulation. TheQ(10)of N mineralization was similar among intact, degraded and restored soils (0.84-1.24) and was higher in topsoil (1.09) than in subsoil (0.92). The best predictive factor of CO2-Q(10)for intact grassland was microbial biomass, for degraded grassland was basal microbial respiration, and for restored grassland was soil bulk density. Restoration by planting vegetation decreased theQ(10)of SOM mineralization as soil bulk density, the most important negative predictor, increased in restored grassland. TheQ(10)of SOM mineralization in topsoil was 14% higher than in subsoil because of higher microbial abundance and exo-enzyme activities. The NH(4)(+)content was greatest in intact soil, while NO(3)(-)content was greatest in degraded soil. The SOM mineralization rate decreased with grassland degradation and increased after long-term (>10 years) restoration. In conclusion, extremely degraded grassland needs proper long-term management in active restoration projects, especially for improvement of soil nutrients in a harsh environment.read more
Citations
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Microbial necromass as the source of soil organic carbon in global ecosystems
TL;DR: In this paper, the contents of fungal and bacterial necromass were estimated based on glucosamine and muramic acid contents in cropland (986 samples), grassland (278 samples), and forest (452 samples).
Journal ArticleDOI
Mechanisms of soil organic carbon stability and its response to no-till: A global synthesis and perspective
TL;DR: In this paper, the authors reviewed the mechanisms affecting soil organic carbon (SOC) stabilization in no-till (NT) systems, including the priming effects (PE), molecular structure of SOC, aggregate protection, association with soil minerals, microbial properties, and environmental effects.
Journal ArticleDOI
Soil ecoenzymatic stoichiometry reveals microbial phosphorus limitation after vegetation restoration on the Loess Plateau, China
Xinhui Han,Shiro Oka +1 more
TL;DR: In this article , the authors measured soil physicochemical properties, microbial biomass, and the activities of four enzymes (ꞵ-1,4-glucosidase, leucine aminopeptidase and alkaline phosphatase) in the soils of the northern Loess Plateau.
Journal ArticleDOI
Above-belowground interactions in alpine ecosystems on the roof of the world
Journal ArticleDOI
Impact of sulphuric, hydrochloric, nitric, and lactic acids in the preparation of a blend of agro-industrial digestate and wood ash to produce a novel fertiliser
Alejandro Moure Abelenda,Kirk T. Semple,Alfonso Jose Lag-Brotons,Ben M.J. Herbert,George A. Aggidis,Farid Aiouache +5 more
TL;DR: In this paper, the use of low-pollutant biomass bottom ash as an adsorbent to decrease the availability and the losses of carbon and nutrients was evaluated to enhance the adsorption and to improve the dewaterability of the organic waste.
References
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Aboveground Production and N and P Cycling Along a Nitrogen Mineralization Gradient on Blackhawk Island, Wisconsin
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