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黑河流域山区牧坡草地土壤呼吸的时间变化及水热因子影响

常宗强1 史作民2 冯起1 苏永红1   

  1. 1中国科学院寒区旱区环境与工程研究所,兰州 730000; 2中国林业科学研究院森林生态环境与保护研究所 国家林业局森林生态环境重点实验室,北京 100091
  • 收稿日期:2005-04-08 修回日期:2005-05-31 出版日期:2005-09-18

Temporal variation of soil respiration on sloping pasture of Heihe River basin and effects of temperature and soil moisture on it

CHANG Zongqiang1,SHI Zuomin2,FENG Qi 1,SU Yonghong 1   

  1. 1Key Laboratory on Forest Ecology and Environment,State Forestry Administration,Institute of Cold and Arid Regions Environmental and Engineering,Chinese Academy of Sciences,Lanzhou 730000,China;2Institute of Forest Ecology,Environment and Protection,Chinese Academy of Forestry,Beijing 100091,China

  • Received:2005-04-08 Revised:2005-05-31 Online:2005-09-18

摘要: 采用LI6400-09土壤呼吸室和LI-6400便携式光合作用测量系统,在生长季节对黑河流域山区牧坡草地土壤呼吸速率进行了连续观测,研究不同环境条件下土壤CO2释放速率及其对气候和土地利用变化的反馈作用.结果表明,牧坡草地土壤呼吸速率的日变化规律为夜间土壤呼吸速率较低,最低值在5~10月份,分别出现在7:00、6:30、5:30、5:00、6:00和 7:00,此后开始升高,达到最大值的时间分别为15:00、14:30、14:30、13:30、14:00和15:00,在16:00~18:30又逐渐下降,整个过程呈单峰曲线;土壤呼吸速率日均值介于0.31~6.98 μmol·m-2·s-1.土壤呼吸速率7、8月份最高,5月与9月份次之,4月与10月份基本一致,整个过程的变化趋势呈单峰曲线形式.土壤呼吸速率与温度呈显著指数关系,与土壤含水量呈显著乘幂关系.

关键词: 樟子松, 高生长, 不整齐性, 偏斜度, 邻体竞争

Abstract: Employing LiCor 6400 gas exchange analyzer and soil respiration chamber attachment (LiCor Inc.,Lincoln,NE,USA),this paper continuously measured the soil surface CO2 effluxes on the sloping pasture of Heihe River basin from early April to late October 2003 to investigate the soil CO2 efflux rate and its feedback to the changes of climate and land use.The results showed that from May to October,the diurnal variation of soil respiration was low at night,the lowest at 7:00,6:30,5:30,6:00 and 7:00,raised rapidly at 7:00~8:30,and then descended at 16:00~18:30.The maximum soil CO2 efflux appeared at 15:00,14:30,14:30,13:30,14:00 and 15:00.The mean daily soil respiration rate was 0.31~6.98 μmol·m-2·s-1,with the maximum in July and August,the second in May and September,and nearly consistent in April and October.Soil respiration rate had an exponential and power correlation with temperature and soil moisture,respectively.

Key words: Pinus sylvestris varmongolica, Height growth, Skewness, Inequality, Neighborhood competition