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| Forest and grass coverage calculation and acceptance criteria for production and construction projects involving urban representing requisitioned land: Taking Beijing as an example |
| BI Huaxing1,2,3, HOU Guirong1,4, YUAN Pujin5, ZHOU Lianxiong6, GONG Yaguang7 |
1. School of Soil and Water Conservation, Beijing Forestry University, 100083, Beijing, China;
2. Ji County Station, Chinese National Ecosystem Research Network(CNERN), 042200, Jixian, Shanxi, China;
3. Key Laboratory of State Forestry Administration on Soil and Water Conservation, Beijing Engineering Research Center of Soil and Water Conservation, Engineering Research Center of Forestry Ecological Engineering, Ministry of Education, Beijing Forestry University, 100083, Beijing, China;
4. College of Forestry, Sichuan Agricultural University, 611130, Chengdu, China;
5. The Center of Soil and Water Conservation Monitoring, the Ministry of Water Resources, 100055, Beijing, China;
6. Beijing Linfengyuan Ecological Environment Planning & Design Institute Co., Ltd., 100083, Beijing, China;
7. Beijing Soil and Water Conservation Center, 100036, Beijing, China |
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Abstract [Background] It is easy to calculate the water and soil loss control indicators for general production and construction projects according to the GB/T50434—2018, however, the calculation of forest and grass coverage index becomes extremely complex when representing requisitioned land (refers to the land which a construction organization represents government to requisition) is included into production and construction project. According to statistics by Beijing Soil and Water Conservation Center, the probability of representing requisitioned land included in the production and construction project is very high and there are different scenarios for representing requisitioned land in Beijing.Therefore, the calculation method and formula of forest and grass coverage rate is becoming a very important issue for different scenarios of representing requisitioned land in production and construction projects. [Methods] First we summarized 4 classification conditions of representing requisitioned land from the practical experiences. Then we calculated the forest and grass coverage rates of 6 scenarios based on the 4 classification conditions. The forest and grass coverage rate was the area of forest and grass vegetation, i.e., all artificial and natural woodland and grassland areas within the scope of prevention and control responsibility of production and construction projects divided by the area of responsibility for prevention and control, i.e., where the production and construction organization should undertake the obligation to prevent and control soil and water loss according to law, including land of requisition, occupation, use and jurisdiction of the project.[Results] 1) Four classification land conditions are ① whether representing requisitioned land has been constructed already or not when a production and construction project starts to build; ② whether representing requisitioned land will be constructed by construction project organization or not; ③whether representing requisitioned land has been transferred to the ownership organization or not when soil and water conservation measures are checked(whether forest and grass coverage rate meet the acceptance criteria for soil erosion control or not) for the production and construction project; and ④ whether representing requisitioned land has been disturbed during the construction of the project or not. 2) Correspondingly,the calculated results of forest and grass coverage rate in this project case were from 24.44% to 33.3% in the 6 scenarios of representing requisitioned land. i.e., some were lower than the acceptance standard 25% of forest and grass coverage required in this project, implying that forest and grass coverage of some scenarios was not acceptable. [Conclusions] The calculated values of forest and grass coverage vary in different scenarios of the representing requisitioned land, which causes the conflict of the acceptance conclusion on soil and water conservation. Therefore,it is necessary to classify different scenarios of representing requisitioned land in the compile of water and soil conservation plan for production and construction projects and calculate the corresponding forest and grass coverage, which may allow us to accurately grasp whether the project’s forest and grass coverage rate has reached the acceptance standards or not.
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Received: 25 February 2020
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