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Citation:

TheM inera liza tion of So il Nitrogen and ItsMotiva ting Factors to the DragonSpruce Forest and AlpineMeadows of the Qilian Mounta ins

  • Received Date: 2007-04-10
    Accepted Date: 2007-10-28
  • To understand the effects of varying soil temperature and changing in soilwater content on the decomposition ofsoil nitrogen, an anaerobic incubation experiment with orthogonal experiment in an artificial climatic chamber wasconducted to investigate how the mineralization of soil nitrogen of the slopes under the Qilian Mountains forest( dominated by Picea crassifolia) and alp ine meadowswere affected by temperature, soilwater content, soil dep th,and mountain altitudes. The results showed that based on the range of soil nitrogen mineralization, the effects of soildep th and interaction between soil water content and temperature on soil nitrogen mineralization were the highest,next was the effects of changing in temperature, and the effects of soilwater content on them was the lowest. Basedon the range of soil nitrogen mineralization ratio, the effects of soil temperature and interaction between soil watercontent and temperature on soil nitrogen mineralization ratio were also the highest, nextwere the effects of changing in soil water content, and the effects of soil dep th on them was the lowest. The effects of soil temperature andinteraction between soil water content and temperature on soil nitrogen mineralization were significant, while theeffects of these factors on the ratio of soil nitrogen mineralization were not significant ( P P P P P P < 0. 05). The Q10 ranged from 0. 7 to 2. 0, and itwas lower from 5℃ to 15 ℃ than that from 15 ℃ to 25 ℃ or 25 ℃ to 35 ℃. The results showed that the soil nitrogen mineralizationundermountain forest and alp ine meadowswould be influenced greatly by changing in temperature.
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TheM inera liza tion of So il Nitrogen and ItsMotiva ting Factors to the DragonSpruce Forest and AlpineMeadows of the Qilian Mounta ins

  • 1. Chinese Academy of Environmental Sciences, Beijing 100012, China
  • 2. Beijing Forestry Universities, Beijing 100083, China
  • 3. 2 The Science and Technology University of Beijing, Beijing 100083, China

Abstract: To understand the effects of varying soil temperature and changing in soilwater content on the decomposition ofsoil nitrogen, an anaerobic incubation experiment with orthogonal experiment in an artificial climatic chamber wasconducted to investigate how the mineralization of soil nitrogen of the slopes under the Qilian Mountains forest( dominated by Picea crassifolia) and alp ine meadowswere affected by temperature, soilwater content, soil dep th,and mountain altitudes. The results showed that based on the range of soil nitrogen mineralization, the effects of soildep th and interaction between soil water content and temperature on soil nitrogen mineralization were the highest,next was the effects of changing in temperature, and the effects of soilwater content on them was the lowest. Basedon the range of soil nitrogen mineralization ratio, the effects of soil temperature and interaction between soil watercontent and temperature on soil nitrogen mineralization ratio were also the highest, nextwere the effects of changing in soil water content, and the effects of soil dep th on them was the lowest. The effects of soil temperature andinteraction between soil water content and temperature on soil nitrogen mineralization were significant, while theeffects of these factors on the ratio of soil nitrogen mineralization were not significant ( P P P P P P < 0. 05). The Q10 ranged from 0. 7 to 2. 0, and itwas lower from 5℃ to 15 ℃ than that from 15 ℃ to 25 ℃ or 25 ℃ to 35 ℃. The results showed that the soil nitrogen mineralizationundermountain forest and alp ine meadowswould be influenced greatly by changing in temperature.

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