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  

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

作　　者：刘殿君 张金鑫[2,3] 卢琦[2] 李旭 武哲 

机构地区：[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　　处：《生态学杂志》2016年第3期584-590,共7页Chinese Journal of Ecology

基　　金："十二五"科技支撑项目(2012BAD16B01);林业公益性行业科研专项经费(201104077);林业科学技术研究项目(CAF201202)资助

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(Q_(10))的影响。结果表明:增雨明显增加了裸地的Q_(10),但未能显著改变灌丛的Q_(10)与对照相比,增雨16 mm使裸地Q_(10)显著增加28%,达1.83±0.30;在整个生长季,裸地和灌丛的Q_(10)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Q_(10)对土壤水分的敏感性(1.94)高于灌丛(1.57)。In order to analyze the effects of rain supplementation on soil respiration rate of Nitraria sphaerocarpa community,we measured the temperature sensitivity of respiration（ Q_（10）） from bare and vegetated soils in a hyperarid area（ Dunhuang） during the growing season. The results showed that Q_（10） was enhanced significantly with the increase in rain supplementation in the bare soils,but there was no obvious influence on Q_（10） of the vegetated soils. The rain supplementation（ 16 mm,200% of the control） significantly increased the Q_（10） of the bare soils by 28%（ P〈0.05）. There was a significant positive correlation between Q_（10） 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）.

关 键 词：土壤呼吸 人工增雨 土壤呼吸的温度敏感性 

分 类 号：Q948.1[生物学—植物学]