挠力河流域水稻生育期水分供需特征研究

基于MODIS遥感序列数据、常规气象数据、水稻生育期资料,利用区域遥感蒸散模型和水分盈亏评价模型,从栅格尺度揭示挠力河流域水稻生育期水分供需特征及水分盈亏状况.研究发现:①全生育期的需水均值和降水均值分别为673.88 mm和291.81mm,且各生育期的水分供需态势存在较大差异.中期的有效降水量与需水量分别占全生育期...

Water Supply and Demand Characteristics of Rice Growing Stage in the Naoli River Basin

The agricultural structure of the Naoli River Basin had been greatly adjusted with large amount of dry crops changed into rice. This resulted in a set of problems in the utilization of water resources. To reveal the water profit and loss situation of the rice in this river basin, we collected MODIS remote sensing sequence data, conventional meteorological data and rice growth period data from 2000 to 2018, and then on the basis of regional remote sensing evapotranspiration model and water profit and loss evaluation model, the water supply and demand characteristics and water profit and loss status of rice growth period in the Naoli River Basin were revealed from grid scale. The results showed that: 1) The characteristics of water supply and demand in different growth stages of rice were different in the Naoli River Basin. The effective precipitation in the whole growth period of rice reached to 291.81 mm, and the middle growth period accounted for 42.25%. The corresponding water demand in the middle growth period of rice was 673.88 mm, the effective precipitation of water demand in the growth and maturity period of rice were at a low level; 2) It owned a significant water supply and demand gap in the Naoli River Basin, which made the basin in a state of natural water shortage for a long time. The water shortage in the whole growth period was 382.08 mm, which was characterized by high water shortage in the West and northwest of the basin, and it also showed low water shortage in the East, South and north of the basin. The water shortage in the middle growth period accounted for 52.85%; 3) Drought was the normal state of rice water supply and demand in the Naoli River Basin, the whole growth period and the early growth period were dominated by the type of mild drought, and the middle growth period as dominated by the type of mild drought The area of moderate arid area increased by about 10.68%. The direction and polarization characteristics of moderate arid area were very prominent. However, in the growth and maturity period, the water shortage situation in the basin was more severely, and there were about 3.89% relative area ratio of severe arid area in the south central part of Baoqing county. 4) The Naoli River Basin should carry out different rice irrigation management according to the water supply and demand characteristics in different growth periods. Northwest and southeast of the basin should be guaranteed respectively based on the water demand, especially for the middle growth period and the mature period. The above statement shows that the water deficit of the rice in this river basin has been further intensified. These research results provide the references and consultancies for the paddy fields irrigation schemes in the Naoli River Basin and Sanjiang Plain.