| 宇万太,马强,沈善敏,张璐,姜子绍.下辽河平原不同生态系统土壤呼吸动态变化[J].干旱地区农业研究,2010,28(1):122~129 |
| 下辽河平原不同生态系统土壤呼吸动态变化 |
| Seasonal fluctuation of soil respiration with different ecosystems in the lower reaches of the Liaohe River Plain |
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| DOI：10.7606/j.issn.1000-7601.2010.01.23 |
| 中文关键词: 土壤呼吸 生态系统 季节变化 |
| 英文关键词:soil respiration ecosystem seasonal fluctuation |
| 基金项目:中国科学院创新项目(KZCX2-YW-407, KZCX2-YW-405); 自然科学基金项目(40701067); 国家科技支撑计划课题“东北黑土区地力衰减农田综合治理技术模式研究与示范”（2008BADA7B08） |
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| 中文摘要: |
| 利用长期定位试验对下辽河平原农田生态系统、人工林生态系统和草地生态系统等土壤呼吸状况进行了分析，探讨了不同生态系统土壤呼吸强度的季节变化规律及其主要影响因素。结果表明：下辽河平原不同生态系统土壤呼吸强度季节动态变化趋势基本一致，土壤呼吸强度高峰首先出现在水、热条件适宜的夏季，而后在秋季由于有机物归还量增加，且水热条件亦较适宜的情况下再一次出现高峰；在农田生态系统中，施肥可明显增强土壤呼吸作用，两年平均土壤呼吸强度NPK+M与NPK分别比CK处理提高70%和40%；在草地生态系统中，有机物料归还和人类活动是影响土壤呼吸的主要因素，其强度变化顺序为：每年收获移出＞荒地＞裸地；人工林生态系统虽有一定有机物料输入，但其数量有限，呼吸强度低于农田生态系统和草地生态系统。 |
| 英文摘要: |
| Soil respiration is one of important sources of CO2 emitted from biosphere to atmosphere. Based on a long-term monitor results, seasonal fluctuation and main influence factors of soil respiration with different ecosystems in the lower reaches of the Liaohe River plain were analyzed. The results showed that there was a similar seasonal pattern for soil respiration with different ecosystems. The first peak value was in summer with suitable hydro
thermal condition, and the second was in autumn. Fertilization could increase soil respiration in agro-ecosystem and the highest soil respiration was in NPK+M treatment, followed by NPK, and the lowest in CK. Compared with CK treatment, soil respiration was increased by 70% and 40% for NPK+M and NPK treatments, respectively. Soil respiration in grass ecosystem was determined by the rate of organic materials returning and human activities. The changes of soil respiration intensity was mowing land＞waste land＞bare land. Although it had some residues backed to plantation ecosystem, soil respiration in plantation system was still lower than in agro-ecosystem and grass ecosystem. |
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