农田生态系统CO2通量的转换计算

应用生态学报 ›› 2001, Vol. ›› Issue (5): 726-730.

农田生态系统CO₂通量的转换计算

张永强¹, 刘昌明¹, 沈彦俊¹, 于沪宁²

1. 中国科学院石家庄农业现代化研究所, 石家庄 050021;
2. 中国科学院地理科学与资源研究所, 北京 100101

收稿日期:2000-02-28 修回日期:2001-06-21
通讯作者: 张永强,男,1975年生,研究实习员,在职博士生.现主要从事农田水热、CO₂通量的界面传输过程,作物水分生理生态过程以及农田水资源评价等方面的研究工作,发表论文5篇.E-mail:yongqzhang@ns.sjziam.ac.cn
基金资助:
国家自然科学基金重大项目(49890330)和国家自然科学基金资助项目(49871020、49801003)

Transitional calculation on carbon dioxide flux over agro-ec osystem

ZHANG Yongqiang¹, LIU Changming¹, SHEN Yanjun¹, YU Huning²

1. Shijiazhuang Institute of Agricultural Modernization, Chinese Academy of Sciences, Shijiangzh uang 050021;
2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101

Received:2000-02-28 Revised:2001-06-21

摘要/Abstract

摘要： 通过冬小麦单叶CO₂通量与冠层CO₂通量的同步测定,发现不同日期净光合速率(Pn)和冠层CO₂通量(F_CO₂)变化趋势相同,但峰值出现的时间不一致.CO₂浓度差与F_CO₂日变化趋势相反,CO₂浓度差最小时F_CO₂达到最大值;空气动力学法计算的F_CO₂与采用积分法计算的冠层CO₂通量(Ac)呈明显的倒"U”字型日变化趋势,而Ac日变化过程波动性小;采用积分法模拟的日同化量与空气动力学法计算日同化量有时相差很小,但有时误差大,由于模拟冠层通量Ac值只考虑了光强的变化,而实际上.温度、风速、土壤湿度等变化均对冠层CO₂通量产生影响.

关键词: 农田生态系统, CO₂通量, 转换计算

Abstract: Through simultaneous measuring on photosynthesis rate of a single leaf and CO₂ flux above winter wheat canopy, the results showed that diurnal change of net p hotosynthesis rate was the same as that of canopy CO₂ flux (F_CO₂ abstract Diu rnal change of CO₂ difference was contrary to that of F_CO₂, and while the CO₂ difference was the least, F_CO₂ was the highest. The diurnal c hange of F_CO₂ calculated by aerodynamics and Ac calculated by net photos ynthesis rate were both in the shape of inverted "U", but the diurnal change of Ac fluctuated more smoothly than that of F_CO₂. The daily assimilation quantity calculated by integral method was almost the same as that calculated by aerodynamics in some days, but not in other days because the simulating Ac was only considered light intensity. Actually, other environmental factors such as t emperature, wind speed, and soil moisture would affect canopy CO₂ flux.

Key words: Farmland ecosystem, CO₂ flux, Transitional cal culation

中图分类号:

S161.9

张永强, 刘昌明, 沈彦俊, 于沪宁. 农田生态系统CO₂通量的转换计算[J]. 应用生态学报, 2001, (5): 726-730.

ZHANG Yongqiang, LIU Changming, SHEN Yanjun, YU Huning. Transitional calculation on carbon dioxide flux over agro-ec osystem[J]. Chinese Journal of Applied Ecology, 2001, (5): 726-730.

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农田生态系统CO₂通量的转换计算

Transitional calculation on carbon dioxide flux over agro-ec osystem

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