Spatiotemporal Evolution Of Irrigation Area And Its Influencing Factors

China is a large agricultural country with water scarcity.Water resources are the support of agricultural production,and agricultural production is the foundation of the national economy.70% of Chinas total water consumption is used for agricultural water,of which water used for irrigation accounts for more than 90% of agricultural water consumption.Chinas agricultural water shortage and waste,irrigation water management is relatively weak.The increasing demand for population and food has increased the demand for irrigated areas.Irrigation area monitoring is the core of irrigation area management,and it is also an important index to evaluate irrigation efficiency and regional water resources management.Effective monitoring of irrigation area can understand the trend of irrigation water,and provide data support for the management,distribution and scheduling of irrigation water.Remote sensing technology has the advantages of large amount of information,multi-platform and multi-resolution(time and space),fast,and large coverage area.It is the best means to timely grasp information such as agricultural resources,crop growth,and agricultural disasters.Changing the passive situation of agricultural production has a special role.In order to explore the evolution law of irrigation area and its influencing factors,this paper takes the Peoples Victory Canal irrigation area as an example,and the main research contents and results are summarized as follows:(1)Based on 9 years Landsat data with intervals in the Peoples Victory Canal irrigation area,the change of irrigation area from 1987 to 2018 was analyzed.The irrigation area of different water sources in the peoples Victory Canal irrigation area was extracted by remote sensing interpretation and supervised classification.In terms of time evolution,the canal irrigation area of the Peoples Victory Canal irrigation area from 1987 to 2018 showed a significant trend of decrease.There was no obvious regularity in the change of canal irrigation area from 1952 to 1966.From 1966 to 1976,the change of canal irrigation area showed a periodic increase and decrease,and there was a small decrease trend.From 1976 to 2000,the canal irrigation area was relatively stable,and showed a trend of slow increase.In terms of spatial evolution,the center of gravity of the canal irrigation area is offset by a certain distance to the southwest.After 2000,the canal irrigation area of the irrigation area continued to decrease,and the well irrigation area increased relatively.Overall,the area converted from canal irrigation to well irrigation during the 32 years from 1987 to 2018 is much larger than the area converted from well irrigation to canal irrigation.The cultivated land in the middle and lower reaches of the irrigation area has basically become a well irrigation area,and only a few cultivated land close to the main canal still use canal irrigation.(2)In terms of the influencing factors of the evolution of the Peoples Shengli Canal Irrigation District,this article starts with spatial physical factors and socioeconomic factors.The trend changes of each influencing factor were analyzed by means of cumulative anomaly and mann-kendall trend analysis,and the influence factors were respectively correlated with the change of canal irrigation area in the irrigation area,and the functional relationship between the irrigation area and the influencing factors was further obtained.Among the spatial physical factors,the amount of water diversion and the distance from the cultivated land to the channel have a strong correlation with the irrigation area of the irrigation area.The precipitation has a weak correlation with the irrigation area of the irrigation area.The buried depth of groundwater has a very weak correlation with the irrigation area of the irrigation area.Among the socioeconomic factors,there is a weak correlation between agricultural water fees,irrigation district management agency income and irrigation area irrigation area.Canal irrigation construction investment,irrigation area management agency expenditure and irrigation area irrigation area have a very weak correlation.