Land Remediation Projects For Ecosystem Services Influence Research

Land is the foundation of human survival and development,the land resource is the most important of the social economy development and the human life and the necessary resources,with the increasing contradiction between human and land,the land reclamation as main measures to solve the contradiction between human and land,has played an extremely important role.Ecological system is the carrier of human production and life.The balance and stability of ecological system is an important condition to maintain the smooth development of human society and economy.Land reclamation project implementation will have influence on the ecological system,in order to make the land reclamation is more intuitive to show the influence of the ecological environment,this article selects the ecosystem service value method to land reclamation activities in different time after the completion of the node,to quantify the ecosystem services value of calculation before and after the land reclamation activities and completion of land reclamation activity changes at different times of the ecosystem services value,this paper summarizes its change rule,and land reclamation plan for the future to provide more comprehensive and reasonable scientific basis.This paper selects five land reclamation projects completed in Laiyuan County,Hebei Province,and conducts surveys and sampling tests,combining the theory of ecosystem services value and space-time intergenerational method,market value method,shadow engineering method,coefficient correction method and other methods.After calculating the value of ecosystem services at different time periods after land reclamation is completed,the main conclusions are as follows:1)After land reclamation,the ecosystem service value per unit area of the farmland decreased from 26,923.54 yuan/hm~2 to 18,339.32 yuan/hm~2,and the reduction value was4,482.18 yuan/hm~2,down 18.13 percentage points.The value of the hydrological regulation service value decreased greatly,reduction value is 223.50 yuan/hm~2,a decrease of 40.91percentage points.The reduction in soil service value is smaller,with a reduction value of21.91 yuan/hm~2,a decrease of 9.66 percentage points,and the reduction ratio of other types of ecosystem services was about 18%.However,the newly added arable land after the land remediation increased the area of farmland ecosystem,and the total value of farmland ecosystem services increased compared with that before the reclamation.2)After land reclamation,the value of ecosystem services per unit area of various types of ecosystems involved in the project area will be reduced,the farmland ecosystem will be reduced by 4882.18 yuan/hm~2,the desert ecosystem will be reduced by 1349.85 yuan/hm~2,and the grassland ecosystem will be reduced by 3507.10 yuan/hm~2,the river/lake ecosystem decreased by 27,375.55 yuan/hm~2 with a reduction rate of 18.13%.However,in the land reclamation process,the development of ecosystem types with low ecosystem service value,such as desert ecosystems and grassland ecosystems,has been transformed into ecosystem types with higher ecosystem service value,such as cultivated land ecosystems and river/lake ecosystems.The total value of the total ecosystem service in the project area was higher than that before the renovation.3)After the restoration of different time periods,the ecosystem service value of the farmland ecosystem per unit area first decreased,then increased,and finally it tended to be flat.The amount of recovered value in one year decreased by 4882.19 yuan/hm~2 compared with the unremedied area,a decrease of 18.13 percentage points;the recovery was reduced by 2272.24 yuan/hm~2 in the three years compared with the unremedied area,and decreased by 8.25 percentage points;the recovery in the five years was 1,427.12 yuan/hm2 compared with the unremedied area,growth rate is5.00 percentage points,the recovery rate in the seven years was 7340.58 yuan/hm~2,an increase of 26.90 percentage points from the unremedied area,and the growth rate in the 9 years was 7697.88 yuan/hm~2,an increase of 27.01percentage points from the un reclamation area.The overall performance is that after the land reclamation,the per unit area of farmland ecosystem was reduced to about 88%before rectification,slowly recovered to the original level of about 92%within the recovery period of 1-3 years,and recovered during the recovery period of 3-5 years,returned to the level of100%before remediation,entered a period of rapid recovery in 5-7 years,returned to about120%before remediation,and then stabilized.