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土壤圈(英文版). 2005, (01)

Soil N Pools and Transformation Rates Under Different Land Uses in a Subalpine Forest-Grassland EcotoneEnglish Full Text

SUN Geng, WU Ning and LUO PengChengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041 (China).

Abstract: Soil nitrogen pools （NP）, denitrification （DN）, gross nitrification （GN）, N2O and CO2 flux rates with their responses to temperature increases were determined under five different land uses and managements in a subalpine forest-grassland ecotone of the eastern Tibetan Plateau. Land uses consisted of 1) sparse woodland, 2) shrub-land, 3) natural pasture, 4) fenced pasture, and 5) tilled pasture mimicking a gradient degenerating ecosystem under grazing impacts. The NO3--N content was higher than the NH4+-N content. Comparing tilled pasture with fenced pasture showed that higher intensive management （tillage） led to a significant decrease of soil organic matter （SOM） （P ＜ 0.05） in the soils, which was in contrast to the significant increases （P ＜ 0.05） of DN, GN, N2O and CO2 flux rates. GN （excluding tilled pasture） and CO2 flux rates increased with a temperature rise, but DN and N2O flux rates normally reached their maximum values at 12-14℃ with tilled pasture （the highest management intensity） being very sensitive to temperature increases. There was a difference between net nitrification and GN, with GN being a better indicator of soil nitrification.
Keywords：

denitrification; gross nitrification; land use; subalpine forest-grassland ecotone; Tibetan Plateau;

  • Series：

    (D) Agriculture

  • Subject：

    Fundamental Science of Agriculture; Agronomy

  • Classification Code：

    S153

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