Investigation On Grassland Resources And Balance Analysis Of Grass And Livestock In Hebei Dam Based On The 3S Technology

In the coordinated development of Beijing—Tianjin—Hebei and national grass animal husbandry development important strategic plan under the environment of the two countries,the author from the perspective of grassland livestock forage supply and energy demand as the breakthrough point,in Hebei bashang region of natural grassland biomass on the ground,the artificial grassland construction,such as combination supplement grass grass yield condition and the breeding balance relationship between grazing capacity are studied?The conclusions are as follows:?1?Best fit model.Exponential model can well simulate the MODIS/NDVI and the correlation between aboveground biomass and the corresponding model formula for y=904.16e^0.0002x,the correlation coefficient R²=0.143,its standard error of 30.26g/m²,average error coefficient is 0.2958,the average prediction accuracy was 70.12%.?2?Normalized vegetation index NDVI.In 2013—2017,the highest value of remote sensing image NDVI in the six counties of the dam is in 2014,which is 65.29×10⁷,and the lowest is49.62×10⁷ in 2015.In the county,the highest is the Fengning county of Chengde,which is66.87×10⁷,and the lowest is Kangbao county of Zhangjiakou,which is 41.22×10⁷.In general,the NDVI value of the six counties on the dam is slightly higher than that of the west.?3?Standard hay production.The most productive counties are Fengning county in Chengde,and the smaller ones are Kangbao and Shangyi county,Zhangjiakou.Five years from 2013 to2017,the six county overall stable aggregate hay yield in more than 800000 tons,present a fluctuating yield,reducing overall trend,hay yield and growth rate of-1.92%,5.98%,-1.80%,-2.88%.?4?Balance of grass and livestock.In the six counties of the dam,2014 is the most unreasonable and the most reasonable to carry livestock in 2017.Reasonable grazing capacity of2013—2017 were 67932,64944,69160,64944,69160 sheep unit,the actual grazing capacity respectively 79573,85785,81496,85785,81496 sheep,Overload rate were 17.14%,24.60%,15.90%,17.84%,15.23%,13.85%,breeding balance rate,respectively,85.37%,80.26%,84.86%,86.78%,84.86%.