长春地区稻田甲烷排放量的估算研究

1995～ 1997年 3年的实验研究中 ,用静态箱法和气相色谱仪对长春地区不同水管理方式稻田的甲烷排放进行了采样和测量工作 ,1996年和 1997年逢晴天还同步进行了地面实验基地的卫星遥感数据 (TM和NOAA—AVHRR数据 )的接收工作。根据测算的稻田甲烷排放通量和用遥感数据提取的水稻种植面积 ,估算出区域尺度的稻田甲烷排放总量。 3年来的研究结果显示 ,长春地区水稻种植面积为 17.72 12× 10 4 hm2 ,稻田甲烷平均排放通量为 2 .984mg/(m2 ·h) ,长春地区稻田甲烷总排放量为 0 .0 2 0 3Tg/a。用灰关联方法分析了稻田甲烷排放的影响因子 ,建立了以水稻植被指数为参数的淹灌稻田的甲烷排放通量估算模型

Study on Estimation of Methane Emission from Rice Fields in Changchun Area

The fluxes of CH4 emission from rice fields were measured by the method of static chamber inChangchun area in 3 consecutive years. The research results show that the mean flux of CH4 emission was 2. 984mg/(m2·h) and the total amount of CH4 emission was 0. 0203 Tg/a from the rice fields in Changchun area.Estimation of methane emission is a new application field of remote sensing. The estimating method of ricemethane emission is as follows: 1) TM and NOAA AVHRR data are used to measure rice area and to predict itschange tendency; 2) rice NDVI values are got during various rice growth phases based on remote sensing of ricecondition of growth; 3) the optimum correlation factor is elected according to gray system theory; 4) empiricalformula between rice NDVI and CH4 fluxes of rice field is set up; 5) rice methane emission is estimated by ricearea and NDVI.The method is used to estimate methane emission of rice field for the first time in Changchun area in 1996and 1997. The results are acceptable after examination.