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极端干旱区增雨对泡泡刺(Nitraria sphaerocarpa)群落土壤呼吸温度敏感性的影响

刘殿君1,张金鑫2,3,卢琦2*,李旭1,武哲4   

  1. 1内蒙古自治区水利科学研究院, 呼和浩特 010020; 2中国林业科学研究院荒漠化研究所, 北京 100091; 3中国林业科学研究院林业研究所, 北京 100091; 4内蒙古呼和浩特抽水蓄能发电有限责任公司, 呼和浩特 010020)
  • 出版日期:2016-03-10 发布日期:2016-03-10

Effects of rain supplementation on the temperature sensitivity of soil respiration in Nitraria sphaerocarpa community in a hyperarid area of Dunhuang, China.

LIU Dian-jun1, ZHANG Jin-xin2,3, LU Qi2*, LI Xu1, WU Zhe4   

  1. (1 Inner Mongolia Hydraulic Research Institute, Hohhot 010020, China; 2 Institute of Desertification Studies, Key Laboratory of Tree Breading and Cultivation of State Forestry Administration, Chinese Academy of Forestry, Beijing 100091, China; 3 Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China; 4The Limited Liability Company of Pumped Storage Power Generation, Hohhot 010020, China)
    .
  • Online:2016-03-10 Published:2016-03-10

摘要: 在极端干旱区(敦煌)以泡泡刺群落为研究对象,测定了生长季内增雨对泡泡刺群落灌丛和裸地土壤呼吸温度敏感性(Q10)的影响。结果表明:增雨明显增加了裸地的Q10,但未能显著改变灌丛的Q10;与对照相比,增雨16 mm使裸地Q10显著增加28%,达1.83±0.30;在整个生长季,裸地和灌丛的Q10季节波动与土壤含水量的变化存在极显著相关关系,且裸地的Q10对土壤水分的敏感性(1.94)高于灌丛(1.57)。

关键词: 次生林, 物种多样性, 区系组成, 木腐菌

Abstract: In order to analyze the effects of rain supplementation on soil respiration rate of Nitraria sphaerocarpa community, we measured the temperature sensitivity of respiration (Q10) from bare and vegetated soils in a hyperarid area (Dunhuang) during the growing season. The results showed that Q10 was enhanced significantly with the increase in rain supplementation in the bare soils, but there was no obvious influence on Q10 of the vegetated soils. The rain supplementation (16 mm, 200% of the control) significantly increased the Q10 of the bare soils by 28% (P<0.05). There was a significant positive correlation between Q10 and soil water content during the growing season (P<0.001), and the sensitivity of Q10 to soil water content was higher in the bare soils (1.94) than in the vegetated soils (1.57).

Key words: secondary forest, wood-rotting fungi, species diversity, floral composition