Journal of Resources and Ecology >
Does the Construction of a Power Transmission Line (PTL) in a Coastal Mountainous Area Affect the Regional Ecological Security?—Taking Fujian Tangyuan PTL as an Example
Received date: 2023-03-14
Accepted date: 2023-06-12
Online published: 2023-12-27
Supported by
The Scientific and Technological Project of State Grid Fujian Electric Power Co., Ltd.(52130420002F)
Ecological security and its patterns are hot topics for regional ecological protection. In the subtropical coast mountainous area with high precipitation, complex topography, and frequent typhoons, does the construction of a Power Transmission Line (PTL) affect local ecological security? Taking Fujian Tangyuan PTL as an example, this study examined changes in the Ecological Security Pattern (ESP) at regional and local scales by using Morphological Spatial Pattern Analysis (MSPA), Minimum Cumulative Resistance (MCR) and the Gravity model. The results showed that within the PTL timelines (before, during and after building the PTL), the ecological source area occupied 14.21%, 11.79% and 14.11% of the whole research region; while the important eco-corridors numbered 20, 21 and 16, respectively; and the eco-nodes numbered 168, 123 and 227, respectively. At the local scale, in the PTL buffer space (2 km from the PTL on either side, i.e., the potential ecological impact zone) within the timelines (before-during-after building the PTL), the ecological source area occupied 39.78 km2, 27.44 km2 and 29.88 km2, respectively, and the eco-corridor lengths were 50.78 km, 44.36 km and 67.18 km with 13, 7 and 25 eco-nodes, respectively. Clearly, during the building of the PTL, the ecological “source-corridor” decreased at first and gradually recovered after the construction, while the challenge to the ecological safety from the PTL occurred at the local scale. The results of this study provide a method for evaluating the ecological integrity disturbance by linear projects and scientific protection strategies are proposed.
ZHENG Cuichun , LI Xiaomei , FAN Zhipeng , LI Xi . Does the Construction of a Power Transmission Line (PTL) in a Coastal Mountainous Area Affect the Regional Ecological Security?—Taking Fujian Tangyuan PTL as an Example[J]. Journal of Resources and Ecology, 2024 , 15(1) : 173 -181 . DOI: 10.5814/j.issn.1674-764x.2024.01.015
Table 1 Data information and sources |
Data type | Spatial resolution | Data source |
---|---|---|
Sentinel-2 data | 10 m | ESA (https://earth.esa.int/web/guest/home) |
Rainfall data | 10 km | NASA (https://www.nasa.gov/) |
ASTER GDEM | 30 m | Geospatial Data Cloud (http://www.gscloud.cn/) |
Soil property data | Vector | Institute of Soil Science, Chinese Academy of Sciences (http://www.issas.ac.cn/) |
Road data | Vector | National Catalogue Service for Geographic |
Settlement data | Vector | Information (https://www.webmap.cn/main.do?method=index) |
Table 2 Resistance classification and resistance values of the ecological resistance factors |
Resistance factor | Unit | Weight | Resistance value | |||||
---|---|---|---|---|---|---|---|---|
1 | 3 | 5 | 7 | 9 | 11 | |||
Elevation | m | 0.18 | 0-146 | 146-335 | 335-538 | 538-767 | 767-1416 | - |
Land use type | - | 0.26 | Woodland | Water | Arable land | Unused land | Construction land | - |
Slope | ° | 0.10 | 0.1-7.13 | 7.13-17.18 | 17.18-27.03 | 27.03-37.82 | 37.82-77.71 | - |
Distance from the settlement | m | 0.18 | 3000-5000 | - | 2000-3000 | 1000-2000 | 0-1000 | - |
Vegetation cover | - | 0.05 | 0.87-1 | 0.69-0.87 | 0.48-0.69 | 0.20-0.48 | 0-0.20 | - |
Road density | km km-2 | 0.09 | 0.71 | 0.71-2.08 | 2.08-3.50 | 3.50-5.33 | 5.33-48.91 | - |
Soil erosion intensity | - | 0.13 | Slight | Mild | Moderate | Strong | Extremely strong | Severe |
Table 3 Regional ecological protection hot-spot areas |
Timeline | Variable | Ecological safety protection area | |||
---|---|---|---|---|---|
Cup Creek area | Xixi Reservoir area | Houping Grand Canyon area | East Lion Mountain area | ||
Pre-construction (2019) | Ecological source (km2) | 79.80 | 29.59 | 47.75 | 32.71 |
Ecological corridor (km) | 140.54 | 72.15 | 79.01 | 48.47 | |
Ecological node (piece) | 87 | 27 | 26 | 7 | |
Under construction (2020) | Ecological source (km2) | 62.44 (‒21.75) | 12.20 (‒58.77) | 48.62 (+1.82) | 37.28 (+13.97) |
Ecological corridor (km) | 99.87 (‒28.94) | 48.89 (‒32.24) | 51.32 (‒35.05) | 63.65 (+31.32) | |
Ecological node (piece) | 30 (‒65.52) | 12 (‒55.56) | 22 (‒15.38) | 28 (+300.00) | |
After construction (2021) | Ecological source (km2) | 64.80 (‒18.80) | 18.49 (‒37.51) | 47.25 (‒1.05) | 38.13 (+16.57) |
Ecological corridor (km) | 111.25 (‒20.84) | 57.63 (‒20.12) | 63.32 (‒19.86) | 53.28 (+9.92) | |
Ecological node (piece) | 61 (‒29.89) | 28 (3.70) | 15 (‒42.31) | 40 (+471.43) |
Note: The data in parentheses represent the growth rates compared to pre-construction, %; The same below. |
Table 4 Comparing the impacts of the PTL project on ESPs at two spatial scales |
Timeline | Parameter | Spatial scale | |
---|---|---|---|
Regional scale (Growth rate compared to pre-construction) | Local scale (Buffer area) (Growth rate compared to pre-construction) | ||
Pre-construction (2019) | Ecological source (km2) | 465.66 | 39.78 |
Ecological corridor (km) | 566.44 | 50.78 | |
Ecological node (piece) | 168 | 13 | |
Under construction (2020) | Ecological source (km2) | 386.27 (‒17.05%) | 27.44 (‒31.02%) |
Ecological corridor (km) | 525.04 (‒7.31%) | 44.36 (‒12.64%) | |
Ecological node (piece) | 123 (‒26.79%) | 17 (+30.77%) | |
After construction (2021) | Ecological source (km2) | 462.18 (‒0.75%) | 29.88 (‒24.89%) |
Ecological corridor (km) | 624.02 (+10.17%) | 67.18 (+32.30%) | |
Ecological node (piece) | 227 (+35.11%) | 25 (+92.31%) |
[1] |
|
[2] |
|
[3] |
|
[4] |
|
[5] |
|
[6] |
|
[7] |
|
[8] |
|
[9] |
|
[10] |
|
[11] |
|
[12] |
|
[13] |
|
[14] |
Ministry of Ecology and Environment of China. 2022. Technical guidelines for environmental impact assessment ecological impact:HJ 19-2022. Beijing, China: China Environmental Science Press. (in Chinese)
|
[15] |
|
[16] |
|
[17] |
|
[18] |
|
[19] |
|
[20] |
|
[21] |
|
[22] |
|
[23] |
|
[24] |
|
[25] |
|
[26] |
|
/
〈 |
|
〉 |