| In recent years,with the acceleration of urbanization,Changsha,Zhuzhou,Xiangtan city land to green heart area expansion,human activities leading to serious destruction of vegetation,terrain,urban soil erosion,and the construction of green heart area caused by serious water and soil erosion,caused serious harm the existence and development of Tan green heart.Therefore,studying the characteristics of soil erosion and soil elements in the green zone of Changsha Zhuzhou Xiangtan can provide data support for the construction of the basic information service platform of soil erosion in Chang Zhu Tan ecological green area.This paper takes Changzhutan eco green heart area as the study area,with the"standards of classification of soil erosion"(SL190-2007)as technical specifications of Chang Zhu Tan 2015 eco green heart area and 2016 different erosion intensity,different spatial control zones,different types,different vegetation coverage of different slope,soil erosion intensity and the area under the condition of monitoring and analysis of remote sensing images with high spatial resolution,and through field sampling and laboratory analysis of samples,the contents of soil elements and physical properties of different soil erosion intensity were determined,temporal and spatial variation analysis of soil physicochemical properties.Through analysis and research,the following conclusions are obtained:(1)In 2016,the area of forest land was the largest,accounting for 48.36%of the total area.Grassland and special land area is the smallest,accounting for 0.2%of the total area and 0.02%,respectively.The total area of soil erosion in the green core area increased by 36.68hm2 than in 2015,and the area of mild,moderate and severe erosion decreased by 519.62hm2,and the area of extremely strong and severe erosion increased by 556.30hm2.(2)In 2015,the area of soil erosion in the forbidden zone and the restricted development zone of green zone was reduced by 52.45hm2 and 94.46hm2,respectively,compared with that in 2016,and the area of soil erosion in the control area was increased by 183.59hm2.The soil erosion area of non cultivated land decreased by 227.18hm2 in 2016 compared with that in the year of,and the soil erosion area increased by 174.33hm2,and the soil erosion area of construction land increased by 89.53hm2 in the year of 2015.Slope at 5 degrees-8 degrees,15 degrees-25 degrees,25 degrees-35 degrees,>35 degrees of soil erosion area than in 2015 increased significantly.Among them,the slope of>35 degrees of soil erosion area increased by 236.32hm2,an increase of 2046.1%,the rest of the slope erosion area increased by more than 30%.The area of soil erosion of non cultivated land with different coverage of grass and grass was less than 1745.36 in compared with that of hm2 in the year of 2015,fell 87.83%.(3)Soil physical properties,soil bulk density showed "Xiangtan Zhao Shan township>Zhuzhou white horse ridge Office>Changsha jumping horse township.".The water holding capacity of slight erosion,moderate erosion and strong erosion soil in Changsha horse jumping town was greater than that of the same erosion intensity of Zhuzhou Baima Mountain Office and Xiangtan Zhao Shan village.(4)In soil chemical properties,soil organic matter content in different areas with the same erosion intensity is shown in Changsha horse jumping Township>Zhuzhou white horse ridge Office>Xiangtan Zhao Shan township.The contents of total N,total P,total K,Ca and Mg elements in soil were not the same in different soil erosion areas.The moderate erosion effective Fe content in Xiangtan Zhao mountain area is 158.994mg/kg,at least 5 times of other effective erosion intensity and effective Fe content.Tiaoma,Changsha Zhuzhou Baimalong office,Xiangtan City,Zhuzhou City,Zhao Shan mild erosion Baimalong office moderate erosion soil Mn content(>70mg/kg)compared to other soil erosion intensity Mn was high(<21.000mg/kg).The same erosion intensity,the effective content of Zn in Zhuzhou Baima ridge office and Xiangtan Zhao Shan township is higher than that in Changsha.Tiaoma,Changsha city between Zhuzhou city and Xiangtan City Office Baimalong Zhao Shan different erosion intensity effective soil Cu content had little difference,but Changsha,Tiaoma mild erosion(1.128 mg/kg),strong erosion of soil Cu content(1.242mg/kg)relative to the other two,the content of soil Cu(<0.900 mg/kg)is high.(5)Cr content(67.184mg/kg)of heavy metals in soil was strongly eroded in the horse jumping township of Changsha.Compared with other soil erosion intensities,the content of heavy metal elements(<37.000mg/kg)in soil was higher than that of other soil erosion intensities in.The content of soil heavy metals Cd ranged from 1.958mg/kg to-3.0mg/kg,and there was little difference between the areas with the same erosion intensity.Slight erosion,moderate erosion,strong erosion and heavy erosion of soil heavy metal elements Pb content is shown as "Zhuzhou white horse ridge office">Xiangtan Zhao Shan township>Changsha jumping horse township.The content of heavy metal elements in soil(202.654mg/kg)was strongly eroded by Baima office in Zhuzhou.Compared with other soil erosion intensities,the content of heavy metal elements(<100mg/kg)in soil was higher than that of other soil erosion(Zn)in. |
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