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Response of Alpine Meadow Ecosystem to Experimental Warming and Grazing on the Tibetan Plateau

Author: Update time: 07-19-2009 Printer Text Size: A A A

PI: Shiping Wang

Objectives of the study
: Based on a controlled warming and grazing experiment using a free-air temperature enhancement (FATE) system with infrared heaters and along an elevation gradient from 3200 to 3800 m above sea level, we will determine:
1) effects of warming and grazing on plant community composition, net primary productivity and qualities of forage and litter;
2) effects of warming and grazing on N mineralization, soil solution chem.istry and nutrient availability in soil;
3) effects of warming and grazing (including patches of dung and urine) on greenhouse gases fluxes;
4) effects of warming and grazing on temperature sensitivity of litter and dung decomposition;
5) effects of warming and grazing on net carbon exchange of the ecosystem (NEE).

Monitoring items
1) Environmental variables: vegetation canopy temperature, air temperature at 25 cm above soil surface, soil temperature at 0, 5, 10, 20 and 40 cm depths and soil moisture at 10, 20, 30 and 40 cm depths.
2) Soil: soil solution chemistry at 10, 20, 30 and 40 cm depths, N mineralizeation, C and N concentration.
3) Plant community: species composition, phenology, C and N concentration in leaves, leaf life span and turnover, net primary production, roots dynamics, forage quality, litter production and decompositions of litter and dung;
4) Soil-plant ecosystem: Greenhouse gases fluxes, soil respiration and net carbon exchange of ecosystem (NEE).

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