| 呼伦贝尔地区苜蓿人工草地CO_2通量变化特征 |
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| 引用本文： | 徐丽君,徐大伟,杨桂霞.呼伦贝尔地区苜蓿人工草地CO_2通量变化特征[J].草原与草坪,2015(5):60-64. |
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| 作者姓名： | 徐丽君 徐大伟 杨桂霞 |
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| 作者单位： | 呼伦贝尔国家野外站/中国农业科学院农业资源与农业区划研究所,北京,100081 |
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| 基金项目： | 现代农业产业技术体系建设专项资金，公益性行业(农业)科研专项 |
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| 摘 要： | 试验采用密闭箱技术对呼伦贝尔地区种植的苜蓿人工草地进行碳通量研究,采用反硝化-分解作用模型(DNDC)进行模拟。试验结果表明:对苜蓿人工草地CO2通量24h连续观测发现,CO2通量全天变化的平均值(238.15mg/(m2·h)与11∶00(245.32mg/(m2·h)的通量变化值接近,试验从早上9∶00~11∶00进行温室气体的采集方法合理、可行;在整个生长季变化表明,7、8月CO2通量变化较显著(P0.05),且受到降水的影响较大,伴随降水的发生,CO2通量会发生不同幅度的变化,土壤温度和含水量对CO2通量有一定的影响(r0.45,P0.05);通过DNDC模型的模拟,能较好的反映苜蓿人工草地CO2通量的变化情况,但模拟结果数值普遍有些偏高。
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| 关 键 词： | 苜蓿人工草地 CO2 通量 DNDC 模型 |
CO2 flux of alfalfa pasture in Hulunber |
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| Abstract: | The carbon flux of alfalfa pasture in Hulunber was studied by using the denitrification/decomposi-tion model (DNDC).The results showed that the average CO2 flux in whole day was close to the value at 1 1∶00 by 24 h continuous observation.The proper time for collecting greenhouse gases was between 9∶00 to 1 1∶00 am. In whole growing season,the CO2 emission flux was significant from July and August (P <0.05 ),and which was influenced by precipitation.The fluctuation of CO2 flux was obvious when rainfall occurred,and both soil temperature and soil water content could affect the CO2 flux(r >0.45,P >0.05);DNDC model could properly reflect the changes of CO2 flux in despite of its higher simulated values. |
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| Keywords: | alfalfa carbon flux DNDC model |
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