| 曹兴,陈荣毅,蔡新婷,王斯萌,蒋恒.干旱区绿洲棉田土壤呼吸日变化特征分析[J].干旱地区农业研究,2011,29(5):156~162 |
| 干旱区绿洲棉田土壤呼吸日变化特征分析 |
| Study on diurnal dynamic characteristic of soil respiration in oasis cotton field of arid area |
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| DOI：10.7606/j.issn.1000-7601.2011.05.28 |
| 中文关键词: 干旱区 绿洲棉田 土壤呼吸 日变化 |
| 英文关键词:arid area oasis cotton field soil respiration diurnal dynamic |
| 基金项目:中央级公益性科研院所基本科研业务费(IDM200705)；新疆气象局项目（200825）；新疆气象局青年基金(201132) |
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| 中文摘要: |
| 利用Li-8100土壤碳通量测量系统对绿洲棉田土壤呼吸进行日变化动态测定，结果表明：土壤呼吸有明显的单峰型日变化特征，棉田（滴灌地、漫灌地）、弃耕地的土壤呼吸速率日均值分别为3.45、3.37、1.63 μmol/(m2·s)；峰
值出现在15∶00～20∶00，谷值出现在4∶00～6∶00，6∶00后，土壤呼吸速率上升趋势明显。在不同天气背景下，土壤呼吸日变化格局基本一致，晴天日均值高于阴天，白昼高于夜间；白昼土壤呼吸速率变化剧烈，夜间为波动缓慢的下降过程；棉田土壤呼吸速率昼/夜均值高于弃耕地。 |
| 英文摘要: |
| By using the LI-8100 Automated Soil CO2 Flux System，we determined the diurnal dynamic characteristic of soil respiration in oasis cotton field. The results indicated that：The diurnal fluctuation of soil respiration is characterized by single-peaked curve, and the average rate of soil respiration of drip irrigation field, flood irrigation field and abandoned farml
and is 3.45, 3.37 μmol/(m2·s) and 1.63 μmol/(m2·s) respectively. In addition, the peak value of soil respiration occurrs at 15∶00～20∶00 (Beijing time), the valley value mainly occurrs at 4∶00～6∶00, there is a increasing tendency about the rate of soil respiration after 6∶00. The diurnal changes of soil respiration are similar in different weathers, and the average daily value in fine day is higher than that in cloudy day, which is also higher in day than that at night. The rate of soil respiration changes fiercely during the day and falls slowly during the night. The average values of soil respiration rate during the day and night in cotton field are higher than those in abandoned farmland. |
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