文章摘要
李琪, 武志涛, 杜自强, 张红.基于多源数据的京津风沙源区防风固沙功能变化[J].水土保持学报,2021,35(3):156~162
基于多源数据的京津风沙源区防风固沙功能变化
Evaluation of Sand-fixing Service Based on Multi-resources Data in Beijing-Tianjin Sandstorm Source Region
投稿时间:2020-11-03  
DOI:10.13870/j.cnki.stbcxb.2021.03.022
中文关键词: 防风固沙功能  修正风蚀方程  时空分异  京津风沙源区
英文关键词: sand-fixing function  the revised wind erosion equation  spatio-temporal differentiation  Beijing-Tianjin sandstorm source region
基金项目:国家自然科学基金项目(41977412,U1810101,41871193);山西省高等学校科技创新项目(2020L0014)
作者单位E-mail
李琪1,2,3, 武志涛1,2,3, 杜自强1,2,3, 张红1,2,3 1. 山西大学黄土高原研究所, 太原 030006

2. 黄土高原生态恢复山西省实验室
, 太原 030006

3. 山西亚高山草地生态系统教育部野外科学观测研究站
, 太原 030006 
wuzhitao@sxu.edu.cn 
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中文摘要:
      防风固沙功能是评估区域生态安全程度的重要指标,研究其时空变化和内部差异可为改善生态环境和促进生态系统可持续发展提供重要参考。基于京津风沙源区多源遥感数据,利用修正风蚀方程(RWEQ)和GIS空间统计技术,评估分析了2000—2017年京津风沙源区防风固沙功能时空变化及其区域内部差异。结果表明:(1)区域防风固沙功能明显提升,年均防风固沙量为40.06亿t,防风固沙能力为56.38 t/hm2,且均随年份变化波动增加,年均增速分别为0.41亿t,0.58 t/hm2。其中,二期新增区域防风固沙能力高于一期工程区域。(2)在亚区尺度上,5个亚区整体防风固沙能力均呈增加趋势,其中鄂尔多斯高原沙化土地治理区增加最为明显,为1 611.35万t/a。其中,鄂尔多斯高原沙化土地治理区和坝上草原及华北北部丘陵山地水源涵养治理区是防风固沙功能的主要供给区,占比达57.96%。(3)在像元尺度上,区域自西向东大致呈现出高—低—高的变化趋势,评估期内有54.11%的地区防风固沙能力呈现增加趋势,变动值介于0.10~12.22 t/(hm2·a)。此外,46.83%的地区防风固沙能力高于45.00 t/hm2,防风固沙功能较强。
英文摘要:
      The function of sand-fixing is an important index to evaluate the degree of regional ecological security. Studying the temporal and spatial variations and internal differences can provide important reference for improving the ecological environment and promoting the sustainable development of the ecosystem. Based on multi-source remote sensing data of the Beijing-Tianjin sandstorm source region and using the revised wind erosion equation (RWEQ) and GIS spatial statistics technology, this paper evaluated and analyzed the spatial and temporal changes of sand-fixing function and regional difference in the Beijing-Tianjin sandstorm source region from 2000 to 2017. The results showed that:(1) During 2000-2017, the regional sand-fixing function presented an increasing trend, with the average annual sand-fixing amount of 4.006 billion tons and sand-fixing capacity of 56.38 t/hm2. Both of them increased with time, and the average annual increase rates were 41 million tons and 58 million t respectively. The sand-fixing capacity of the newly added areas in phase Ⅱ was higher than that in phase I project. (2) In the sub-zone scale, five sub-zones' function of sand-fixing was enhanced, and the increasing of desertification land control area on the Ordos Plateau was most pronounced, with 16.113 5 million t/a. The desertification land control area on the Ordos Plateau and the water conservation and control areas in the Bashang Grassland and Hilly regions in north China were the main function supply area of sand-fixing, accounting for 57.96%. (3) On the pixel scale, the studied region showed a high-low-high variation trend from west to east. During the evaluation period, 54.11% of the region showed an increasing trend in sand-fixing capacity, which varied from 0.10 to 12.22 t/(hm2·a). In addition, 46.83% of the studied region had the higher sand-fixing capacity than 45.00 t/hm2, showing a strong function of sand-fixing.
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