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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     被引量:68

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

文献类型:期刊文献

中文题名: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

英文题名:Temporal variation of soil respiration on sloping pasture of Heihe River basin and effects of temperature and soil moisture on it.

作者:常宗强[1] 史作民[2] 冯起[1] 苏永红[1]

第一作者:常宗强

机构:[1]中国科学院寒区旱区环境与工程研究所;[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

年份:2005

卷号:16

期号:9

起止页码:1603-1606

中文期刊名:应用生态学报

外文期刊名:Chinese Journal of Applied Ecology

收录:MEDLINE(收录号:16358421);CSTPCD;;Scopus(收录号:2-s2.0-27744606847);北大核心:【北大核心2004】;CSCD:【CSCD2011_2012】;PubMed;

基金:国家自然科学基金面上项目(30271071);中国科学院"百人计划"资助项目(2003401).

语种:中文

中文关键词:土壤呼吸速率;生长季节;温度;土壤水分;牧坡草地;黑河流域

外文关键词:Soil respiration rate, Growth season, Temperature, Soil moisture, Sloping pasture, Heihe River basin.

分类号:S152.7

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0.31~6.98μmol·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.
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 effiux 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 effiux 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.

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