Soil Moisture Monitoring Of Farmland Based On MODIFIED SWCI Index

As one of the main elements of agricultural climate,Soil moisture plays an important role to exchange energy and water between land and atmosphere.It is an important influence factor in natural geographical conditions and provides a lot of material foundation for plant growth and soil biological survival.Soil moisture not only plays a decisive role in the production of crops,but also can affect the degradation of land and the coverage of regional vegetation.The soil moisture can be regarded as an important influence factor of agriculture.ecology,and climate and water temperature.When one region occurs a loss situation of soil moisture,it may even limit the ecological construction and social development.The paper us a severe drought in the 2014 occurred in Hu Bei Province as an example,based on remote sensing principle and means of remote sensing technology,the landsat-8 data,combined with measured soil moisture data,establish a model of soil relative humidity and make a diagnosis and analysis in Jiang Han plain soil relative humidity condition.The main research contents are as follows:(1)Starting from the principle of agricultural drought,based on the effects of the surface vegetation cover and soil moisture spectral,and the green and SWIR feature space between drought farmland and non-drought farmland,constructs the comprehensive measuring index MSWCI modified surface water.According to the measured soil moisture data of MSWCI index and soil relative humidity correlation were carried out to verify the results showed that the index of the study area in May 2014 6 and 14 November soil relative humidity between the correlation coefficient were 0.733 and 0.658,and through the confidence level of the significant test 0.05.(2)Two OLI image Path123/Row039 Path124/Row039 in May 2014 6 and November 14.and ground measured soil moisture data as the main information source,the establishment of the Jianghan plain area with high precision relative soil moisture inversion model:y =0.01748x-1.10012(x,y,respectively MSWCI index and soil relative humidity).(3)On the basis of the MSWCI index of the soil relative humidity inversion results,monitoring drought condition in Jianghan plain area in 2014,results showed that in 2014.May 6,the soil moisture condition in most of the area was good,but in Jingmen City,Jingshan County,Dangyang city,Zhongxiang City appeared obvious drought;November 14,is in the eastern and western parts of Zhongxiang City,the western region of Jingshan County,northern part of Tianmen City appeared light drought and the rest belong to normal wet state.The above results are not only consistent with the measured data of meteorological data,but also in line with the Hubei Provincial Department of agriculture to monitor the drought in the region.(4)Analyzed the temporal development and spatial distribution of farmland soil moisture in the Jianghan Plain.The results showed that in Jianghan Plain Area in May 2014 6 soil relative humidity and November 14 compared,overall roughly the same,but Jingshan,Zhongxiang City,Jingmen City soil relative humidity relatively low;at the same time,north of Jianghan Plain Area in the two periods of data was the phenomenon of soil relative humidity and other parts of the lower.These findings are consistent with the measured meteorological data obtained from the meteorological bureau.