| 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 |
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| 引用本文： | 常宗强,史作民,冯起,苏永红. 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[J]. 应用生态学报, 2005, 16(9): 1603-1606 |
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| 作者姓名： | 常宗强 史作民 冯起 苏永红 |
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| 作者单位： | 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 |
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| 基金项目： | 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). |
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| 摘 要： | 采用LI600-09土壤呼吸室和LI-600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,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.
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| 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 |
| 文章编号： | 1001-9332(2005)09-1603-04 |
| 收稿时间： | 2005-04-08 |
| 修稿时间： | 2005-05-31 |
Temporal variation of soil respiration on sloping pasture of Heihe River basin and effects of temperature and soil moisture on it |
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| CHANG Zongqiang,Shi Zuomin,FENG Qi,SU Yonghong. Temporal variation of soil respiration on sloping pasture of Heihe River basin and effects of temperature and soil moisture on it[J]. The journal of applied ecology, 2005, 16(9): 1603-1606 |
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| Authors: | CHANG Zongqiang Shi Zuomin FENG Qi SU Yonghong |
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| Affiliation: | 1. Key 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;2. Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China |
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| 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 micromol 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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| Keywords: | Soil respiration rate Growth season Temperature Soil moisture Sloping pasture Heihe River basin. |
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