开放式空气CO_2浓度增高影响稻田大气CO_2净交换的静态暗箱法观测研究  

Determination of net exchange of CO_2 between paddy fields and atmosphere with static poaque-chamber-based measurements.

作　　者：郑循华[1] 徐仲均[1] 王跃思[1] 韩圣慧[1] 黄耀[1] 蔡祖聪[2] 朱建国[2] 

机构地区：[1]中国科学院大气物理研究所,北京100029 [2]中国科学院南京土壤研究所,南京210008

出　　处：《应用生态学报》2002年第10期1240-1244,共5页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金 (4 0 175 0 3 0 );中国科学院知识创新重要方向资助项目 (KZCX2 40 8和KZCX1 SW 0 1) .

摘　　要：首先介绍静态暗箱法 气相色谱法观测确定陆地生态系统地 气CO2 净交换通量的基本原理和方法 ,然后讨论在开放式空气CO2 增加 (FACE)试验中应用该原理和方法观测研究大气CO2 浓度升高对稻田生态系统 大气CO2 净交换通量的影响 .因缺乏必要参数的实际观测值 ,本文只能根据暗箱观测值计算CO2 净交换通量的最小取值NEEmin.NEEmin计算结果表明 ,在插秧 1个月之后的水稻生长期内 ,大气CO2浓度升高 2 0 0± 4 0 μmol·mol-1使稻田生态系统对大气CO2 的净吸收约为对照的 3倍 .为根据暗箱观测准确确定NEE ,还必须在FACE和对照条件下观测水稻植株的暗维持呼吸系数、地上生物量及根冠比动态 .We firstly introduced the method for determining the net ecosystem exchange fluxes of CO 2 (NEE) between croplands and atmosphere, based on field measurements using static opaquechamber/gas chromatography methods was introduced,and the application of this method in the FACE (free-air CO 2 enrichment) study to examine the effects of elevated CO 2 on the NEE over a typical paddy ecosystem was carried out.because of lacking in observation data for some necessary parameters, e.g., dark maintenance respiration coefficient, only the minimum value of NEE (NEE min)was calculated based on opaque-chamber measurements.The NEE min data indicate that CO 2 elevated by 200±40μmol·mol~ -1significantly increased the ecosystem uptake of atmospheric CO 2 by a factor ca.3.To accurately determine the NEE based on opaquechamber measurements, dark maintenance respiration coefficient, above-ground biomass and root∶shoot,i.e.R∶S,ratio of root to shoot should be observed over the whole growing season.

关 键 词：开放式空气CO2浓度增高 大气CO2 静态暗箱法 净交换通量 稻田生态系统 

分 类 号：S511[农业科学—作物学]