Journal of Resources and Ecology >
Research on the Suitability Evaluation of the Development and Utilization of Regional Selenium-rich Soil Resources and Spatial Zoning based on Niche Theory
CHEN Yi, E-mail: chy9647@163.com |
Received date: 2021-07-16
Accepted date: 2021-12-01
Online published: 2023-01-31
Supported by
The Land Development and Consolidation Center Project of Jiangxi Province(91312075474)
The Land Development and Consolidation Center Project of Jiangxi Province(9131207800)
Relying on the advantages of selenium-rich soil resources, the development of special selenium-rich agricultural industry is an effective measure to implement the rural revitalization strategy. This paper took Yuanzhou district as the research area, based on ecological niche theory, creatively determines the dominant and limiting factors of selenium-rich soil resources development and utilization from three aspects of natural resources endowment, land use conditions and ecological protection, constructed the evaluation index system of selenium-rich soil resources development and utilization and ecological niche suitability index measurement model, and explored the suitability of regional selenium-rich soil resources development and utilization and zoning. The research results show that: (1) The area suitable for exploitation of selenium-rich soil resources in the study area is 174658.4 ha, accounting for 68.83% of the total area, mainly distributed around Yuan River and in the central, northern, northwestern and northeastern areas of the study area. (2) Based on the evaluation results of the suitability of selenium-rich soil resources development and utilization and the development of related agricultural industries, the study area was divided into four functional zones of selenium-rich industrial development: core zone, key zone, development zone and radiation zone. The core zone and key zone are suitable for building selenium-rich agricultural industry demonstration area and selenium-rich products breeding production base, and the development zone and radiation zone can vigorously develop selenium-rich modern agriculture and selenium-rich recreation tourism, which will accelerate the development trend of multi-level and diversified selenium-rich industry in study area.This study can provide scientific, reasonable and feasible ideas and methods for the development and utilization of selenium-rich soil resources and the planning and development of selenium-rich industries in similar areas.
CHEN Yi , CAI Haisheng . Research on the Suitability Evaluation of the Development and Utilization of Regional Selenium-rich Soil Resources and Spatial Zoning based on Niche Theory[J]. Journal of Resources and Ecology, 2023 , 14(1) : 67 -83 . DOI: 10.5814/j.issn.1674-764x.2023.01.007
Fig. 1 Technology roadmap for the development and utilization of selenium-rich soil resources based on niche theory |
Table 1 Evaluation index system of suitability for the development and utilization of regional selenium-rich soil resources and optimal niche value |
Evaluation factor | Unit | Evaluation index suitability score | Most suitable value | |||
---|---|---|---|---|---|---|
Class I-100 (Highly suitable) | Class II-70 (Moderate suitable) | Level III-40 (Low suitable) | Level IV-0 (Not suitable) | |||
Soil selenium content | mg kg‒1 | Selenium enrichment Se≥0.4 | Potential selenium enrichment 0.4>Se≥0.3 | Sufficient selenium 0.3>Se≥0.175 | Potential selenium deficiency Se<0.175 | Selenium enrichment Se≥0.4 |
Land use type | - | Cultivated land | Garden land | Woodland, grassland | Construction land, water areas and other land types | Cultivated land |
Terrain slope | ° | <6 | 6-15 | 15-25 | >25 | <6 |
Soil composite pollution index | - | No pollution and slight pollution (P≤1) | Mild pollution (1<P≤2) | Moderate pollution (2<P≤3) | Heavy pollution (P>3) | No pollution and slight pollution (P≤1) |
Ecological conservation | - | The area outside the ecological preservation area | - | - | The area inside the ecological preservation area | The area outside the ecological preservation area |
Basic farmland | - | The area inside the permanent basic field | - | - | The area outside the permanent base field | The area inside the permanent base field |
Table 2 The grading standard of the development and utilization suitability of selenium-rich land resources in the study area |
Level | Comprehensive index of niche suitability | Develop and utilize suitability partitions |
---|---|---|
Class Ⅰ | ≥ 0.8811 | High suitability zone |
Class Ⅱ | 0.7500-0.8811 | Moderate suitability zone |
Class Ⅲ | 0.4055-0.7500 | Low suitability zone |
Class Ⅳ | ≤ 0.4055 | Unsuitable zone |
Fig. 2 The administrative division and geographical location map of the study area |
Fig. 3 Spatial distribution diagram of suitability evaluation index data for the development and utilization of selenium-rich soil resources in the study area |
Fig. 4 Evaluation results of the suitability for the development and utilization of selenium-rich soil resources in the study area |
Fig. 5 Moran’s I index distribution of the evaluation results of the suitability for the development and utilization of selenium-rich soil resources in the study area |
Fig. 6 LISA spatial aggregation map of the comprehensive index of the development and utilization suitability of selenium-rich soil resources in the study area |
Fig. 7 Schematic diagram of the suitability distribution of the development and utilization of selenium-rich soil resources in the study area |
Table 3 Evaluation results and obstacle factors of the suitability for the development and utilization of selenium-rich land resources in the study area |
Partition | Area (ha) | Grid number | Proportion (%) | Main distribution area | Major obstacles | Mean niche suitability index |
---|---|---|---|---|---|---|
Zone Ⅰ | 38910.23 | 489 | 15.33 | Zhaixia Town, Wujiang Town, Xintian Town, Jinrui Town | Terrain slope | 0.9315 |
Land use type | 0.9486 | |||||
Soil selenium content | 0.9943 | |||||
Zone Ⅱ | 58325.56 | 733 | 22.99 | Xintian Town, Jinrui Town, Hongtang Town, Zhuting Town | Soil composite pollution index | 0.6727 |
Terrain slope | 0.7859 | |||||
Soil selenium content | 0.8745 | |||||
Zone Ⅲ | 77422.61 | 973 | 30.51 | Xinfang Town, Binjiang Town, Xicun Town, Wentang Town | Terrain slope | 0.6281 |
Soil composite pollution index | 0.6305 | |||||
Ecological conservation construction | 0.6945 | |||||
Zone Ⅳ | 79093.60 | 994 | 31.17 | Hongjiang Town, Cihua Town, Feijiantan Township, Wentang Town | Basic farmland | 0.7188 |
Ecological conservation construction | 0.7710 | |||||
Soil selenium content | 0.8002 |
Fig. 8 The schematic diagram of the function zoning of the selenium-rich agricultural industry in the study area |
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