| Hebei Zanhuang jujube has a long history and good quality,and it is a local famous and excellent agricultural product in Hebei Province.With the increase of its demand and the expansion of planting scale,such as unscientific planting management and difficult quality improvement have become increasingly prominent.Based on the field investigation of the main planting areas of Zanhuang jujube,this paper analyzes the distribution characteristics of geomorphology,hydrothermal and vegetation of the whole county in three-dimensional space with OLI-TIRS data and DEM data.According to 1:50000 regional geology and 1:200,000stream sediment geochemical survey data,the eco-geological geochemistry background of Zanhuang was studied,and the correlation between jujube quality and eco-geology geochemistry was compared.The physical and chemical properties of jujube were analyzed systematically,and the critical value of grade index of high quality jujube quality was determined.On the basis of extracting the single factor suitable for the growth of high quality jujube,and based on the theory of“Ecological Niche”,the eco-geological geochemistry dosing model of Zanhuang high quality jujube was established by using 3s technology.The three-dimensional spatial planning and layout of Zanhuang jujube is obtained,which provides an accurate scientific basis for the development and layout of high-quality jujube.The main conclusions and results are as follows:(1)The contents of As,Al,B,Cd,Cr,Cu,Fe,Hg,K,Mg,Mn,Na,Ni,Sr,Zn and other elements in stream sediment in Zanhuang area have an obvious linear relationship with the contents of soil.The total amount of elements in surface soil can be estimated and predicted by water system sediments.(2)The quality indexes(soluble sugar,VC,soluble protein,amino acid)and physical and chemical indexes(P,Fe,Zn,Ca)of jujube were quantitatively tested,and the critical value of jujube quality index was divided,and formulated jujube quality evaluation system.(3)Among various Eco-geological geochemical factors,the influence of parent rock type on jujube quality is the most significant,and the rock types suitable for jujube growth should be as follows:Metamorphic Plutonic Rocks>Metamorphic Granite,Low Grade Metamorphic Rock>Carbonate Rock.The suitable hydrothermal conditions are medium and low temperature semi-humid area,medium temperature semi-arid area and medium and high temperature arid area.The jujube located in sunny slope,slope<15°and elevation<200m has higher quality.There is a general correlation between the quality index of high quality jujube and soil elements,which can be used to reflect the effect of soil on the quality of jujube.(4)On the basis of single factor evaluation,different ecological factors were selected as evaluation indexes of high quality jujube suitable area,which were combined into different“Ecological Niche”,and a total of 576 different combinations were obtained.All combinations were divided into four grades,and the specific dosing model of jujube planting was obtained by superposition analysis of different grades.The most suitable area of high quality jujube was 50.77 km~2(6.03%).The distribution area of jujube in the suitable area was 195.07 km~2(23.16%),the general suitable area was 69.54 km~2(8.26%),and the area of non-suitable area was 526.77 km~2(62.55%). |
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