Warming and grazing increase mineralization of organic P in an alpine meadow ecosystem of Qinghai-Tibet Plateau, China

Background and aims Little is known about the soil phosphorus (P) biogeochemical cycling in response to combined warming and grazing, especially in the alpine meadow ecosystem of the Qinghai-Tibet Plateau. Here, we used a free-air temperature enhancement system in a controlled warming-grazing experi...

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Bibliographic Details
Published in:Plant and soil 2012-08, Vol.357 (1-2), p.73-87
Main Authors: Rui, Yichao, Wang, Yanfen, Chen, Chengrong, Zhou, Xiaoqi, Wang, Shiping, Xu, Zhihong, Duan, Jichuang, Kang, Xiaoming, Lu, Shunbao, Luo, Caiyun
Format: Article
Language:English
Subjects:
Acid soils
Agronomy. Soil science and plant productions
Alpine ecosystems
Animal and plant ecology
Animal, plant and microbial ecology
Biogeochemistry
Biological and medical sciences
Biomedical and Life Sciences
Chemical, physicochemical, biochemical and biological properties
Ecology
Forest soils
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Gentiana
Global warming
Grassland soils
Life Sciences
Mountain ecology
Organic matter
Organic soils
Phosphatases
Phosphorus
Phosphorus content
Physics, chemistry, biochemistry and biology of agricultural and forest soils
Plant Physiology
Plant Sciences
Plants
Potentilla
Regular Article
Soil biochemistry
Soil ecology
Soil heating
Soil microorganisms
Soil science
Soil Science & Conservation
Soil-plant relationships. Soil fertility
Soil-plant relationships. Soil fertility. Fertilization. Amendments
Soils
Synecology
Terrestrial ecosystems
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Summary:Background and aims Little is known about the soil phosphorus (P) biogeochemical cycling in response to combined warming and grazing, especially in the alpine meadow ecosystem of the Qinghai-Tibet Plateau. Here, we used a free-air temperature enhancement system in a controlled warming-grazing experiment to test the hypothesis that combined warming and grazing would significantly accelerate mineralization of soil organic P. Methods A two factorial design of warming (1.2–1.7°C temperature increase) and moderate grazing was utilized. A fractionation method was applied to investigate the sizes of different soil inorganic and organic P fractions. Results Results showed that both warming and grazing significantly decreased the quantity of organic P extracted by first NaOH (N(I)Po), as well as the total extractable organic P (TPo) at the 0–10 cm depth. Warming also decreased the total P of soil at 0–10 cm. The combined warming and grazing treatment (WG) led to the reduction of major soil organic P fractions (N(I)Po, TPo) by 40–48% and 28–32%, respectively compared with other treatments at 0–10 cm. The activities of acid and alkaline phosphomonoesterase (AcPME and AlPME) were both enhanced by warming and grazing, and their interaction. Decreased concentrations of soil N(I)Po and TPo were accompanied by increased AcPME activity (P
ISSN:0032-079X
1573-5036
DOI:10.1007/s11104-012-1132-8