景电灌区植被覆盖遥感动态监测

Dynamically Monitoring Vegetation by Remote Sensing in Jingtai Irrigation area

植被盖度是评估区域生态环境的一个重要参数,基于1987、2001年和2008年3期TM遥感数据影像,利用像元二分模型进行了景电灌区植被覆盖度的估算,并通过转移矩阵,对引水灌溉工程措施下形成的绿洲灌溉农业区植被覆盖动态变化进行了定量监测。结果表明:1)受气候条件限制,景电灌区极低覆盖度和低覆盖度所占面积比例在60%以上,植被覆盖度极低。2)1987-2015年,由于景电工程和国家生态建设工程影响,景电灌区植被覆盖度出现了较大波动。极低覆盖度面积迅速减少,其所占面积比例由1987年的62.20%降至2015年的30.86%,年均减少1.19%。灌溉农田所占面积比例由1987年的16.93%增加至2015年的35.91%,年均变化率达0.68%。

Vegetation coverage is an important ecological and environmental parameter for the evaluation of ecological environment.By interpreting the TM images in 1987,2001 and 2015,the vibrations of vegetation coverage in Jingtai irrigation area was studied based on binary pixel model of remote sensing.The results showed that 1）due to the climatic conditions,the ratio of extremely low and low coverage in the area was more than 60%,indicating that the vegetation coverage was very low.2）From 1987 to 2015,due to the implentmentation of Jingtai Electric Power Irrigation Project and national ecological construction project,the ratio of low vegetation cover decreased rapidly,from 62.20%in 1987 to 30.86% in 2015,with an annual decrease of 1.19%.The proportion of irrigated farmland increased from 16.93% in 1987 to 35.91% in 2015,with an average annual rate of change of 0.68%.