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南宁师范大学发文!从地形视角理解中国农村聚落的村域尺度扩张

  • 2026-06-01 12:36:21
南宁师范大学发文!从地形视角理解中国农村聚落的村域尺度扩张

SCI期刊Environmental Impact Assessment Review英文题目:Understanding the village-scale expansion of rural settlements in China from a topographic perspective中文题目:从地形视角理解中国农村聚落的村域尺度扩张发表时间:2026年1月20日文章链接:https://doi.org/10.1016/j.eiar.2026.108344


🏔️ 研究背景农村聚落是乡村人地关系最直接的空间载体,其扩张过程既受社会经济驱动,也深受地形条件的约束。过去40年,中国经历了快速城镇化,农村聚落规模不降反增,呈现出“人减地增”的悖论。然而,既有研究多将地形简化为单一控制变量,且分析尺度以县域或网格为主,难以揭示村域尺度下地形对聚落扩张的系统性调制作用

🎯 研究意义本研究从地形梯度视角出发,首次在全国行政村尺度上系统解构中国农村聚落40年扩张的格局、过程与驱动机制。成果不仅为乡村空间规划、耕地保护、生态修复提供了精细化的科学依据,也为全球地形复杂区的乡村可持续发展研究提供了方法论范式。

📌 研究目的

  1. 构建高程-坡度二维地形分类体系,识别中国行政村的地形类型;

  2. 揭示1980–2020年农村聚落扩张的时空格局、土地利用来源与形态演变

  3. 发展地理加权机器学习(GWML) 框架,比较12种模型,捕捉驱动因素的非线性和空间异质性;

  4. 差异化乡村振兴政策提供地形分区指引。

🗺 研究内容研究集成30m土地利用、DEM、社会经济栅格、路网/河网等多源数据,以全国近70万个行政村(社区) 为基本单元,系统分析了:

  • 九类地形村域单元的聚落分布与扩张差异;

  • 聚落扩张的土地利用转移路径;

  • 村域尺度聚落形态(规模、破碎度、形状、优势度)的40年演变;

  • 基于GWML-SHAP的驱动机制解析与空间非平稳性制图。

📍 研究区概况研究覆盖中国全境(不含港澳台),地形涵盖“三大阶梯”,从东部平原、中部丘陵到西部高原山地,村域单元密度差异悬殊。该区域40年间经历了快速城镇化与乡村空间重构,是研究地形—聚落耦合关系的天然实验室。

📊 数据概况

  • 土地利用:30m,1980–2020年7期,中科院资源环境数据中心;

  • 地形:Copernicus DEM 30m;

  • 自然环境:降水、气温、FVC、土壤类型(SoilGrids);

  • 社会经济:GDP密度、夜间灯光、人口密度(Landscan);

  • 区位:道路(高速/乡村)、河流、城镇驻地距离;

  • 村界:全国行政村边界矢量(GISRS网络);

  • 处理:所有栅格数据统一重采样至1km,通过分区统计关联至村域单元。

⚙️ 研究方法

  1. 地形分类:采用Jenks自然断点法,将高程、坡度各分为三级,构建3×3九宫格地形类型矩阵(L-L, L-M, L-H, M-L, M-M, M-H, H-L, H-M, H-H);

  2. 扩张分析:土地利用转移矩阵、景观格局指数(NP, TPA, MPA, PD, MSI, LPI);

  3. 驱动建模:构建GWML框架——对比OLS、RF、GBDT、XGBoost、CatBoost及其地理加权版本(GWR、GWRF、GW-XGBoost等),Optuna超参优化,独立测试集评估;

  4. 解释分析:最优模型GWRF + SHAP,解析非线性效应与空间异质性。

📈 研究结果

  1. 地形分布极不均衡:L-L村域仅占国土21.74%,却集聚了78.49% 的农村聚落面积(2020年);

  2. 扩张向高海拔陡坡迁移:2000年后,中海拔(1000–2000m)、中坡度(10–15°)区域成为扩张热点;

  3. 土地利用来源差异显著

    • L-L平原:耕地占绝对主导,双向转换频繁;

    • H-H高山:草地为首要来源;

    • 丘陵山地(M-H, L-H):林地贡献突出;

  4. 形态演变

    • L-L村:规模大、密度高、边缘扩张为主;

    • H-H村:规模小、密度极低(PD=0.46,仅为L-L村的1/110)、扩张分散;

    • 全国聚落总体趋向规模增大、破碎化加剧、形状复杂化

  5. 驱动机制

    • GWRF模型最优(R²=0.544),显著优于GWR(0.362)与全局ML;

    • 平原(L-L):土地利用强度、村庄规模、耕地面积、夜间灯光共同驱动;

    • 高海拔缓坡(H-L):生态约束(FVC)为首要限制因子;

    • 山地(M-H):经济密度(GDPD)是克服地形的关键门槛;

    • 土地利用强度、村庄规模呈现“双向非线性”效应:低值可能抑制,高值促进;

  6. 空间非平稳性

    • FVC重要性集中于青藏高原、内蒙北部;

    • LUI呈现“东高西低”梯度;

    • GDPD重要性围绕国家级城市群;

    • 区位因子(道路、城镇)仅在局部凸显。

🧠 主要讨论

  1. 地形梯度并非静态背景,而是人地关系耦合的调制器——既限定扩张边界,又改变用地来源与驱动逻辑;

  2. 村域尺度分析的优势与挑战

    • ✅ 优势:与乡村治理单元同构,政策落地性强;

    • ⚠️ 挑战:近70万村界矢量处理计算量极大,村域社会经济面板数据缺失(依赖1km栅格降尺度);

  3. GWML框架的范式价值:通过系统对比12个模型,证明地理加权+机器学习在复杂地理过程建模中的必要性,SHAP与局部重要性图为非线性、空间异质性提供了可解释工具;

  4. 政策启示:平原乡村应聚焦存量优化、功能提升;山地高原需严守生态承载力,以经济密度突破地形约束。

✨ 创新点

  1. 尺度创新:首次在全国行政村尺度系统研究农村聚落扩张,打破传统县域/网格研究的尺度错配;

  2. 视角创新:构建高程-坡度二维地形梯度分类体系,揭示地形对扩张模式、用地来源、驱动机制的系统性调制作用

  3. 方法创新:提出GWML框架,系统比较12种模型,遴选出最优模型GWRF,并集成SHAP实现非线性、空间异质性归因;

  4. 发现创新:量化了“扩张向高海拔陡坡迁移”的趋势,识别了土地利用强度、村庄规模的双向非线性效应,绘制了全国首套村域尺度驱动因子重要性图谱。

⚠️ 不足与展望

  1. 数据限制:村域社会经济数据缺失,采用1km栅格降尺度存在误差;

  2. 模型上限:最优模型R²≈0.54,仍有未观测因素(如政策、宗族文化、产权制度)未纳入;

  3. 分类主观性:地形分级虽用自然断点,仍存在一定人为设定;

  4. 未来方向

    • 融合高分辨率遥感与POI提升村域社会经济数据精度;

    • 探索时空加权机器学习(GTWR-ML) 捕捉时空二维非平稳性;

    • 结合多情景模拟(PLUS、FLUS) 预测不同地形区乡村聚落演变路径。

✅ 总结本研究以行政村为单元、地形梯度为脉络、40年演变为纵深,首次系统揭示了中国农村聚落扩张的地形分异规律与驱动异质性。研究证明:地形不仅决定了聚落的“起点”,更持续重塑着扩张的“路径”与“逻辑”。所构建的地形分类体系—景观形态测度—GWML-SHAP归因分析框架,为人地关系地域系统研究提供了可推广的范式。成果直接支撑国土空间规划、乡村振兴差异化策略、耕地与生态空间协同保护等重大需求,也为全球地形复杂区的乡村可持续性研究贡献了中国方案。

END

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  1. CONNECT:[ UseTime:0.000560s ] mysql:host=127.0.0.1;port=3306;dbname=d460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000656s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.005356s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004387s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000680s ]
  6. SELECT * FROM `set` [ RunTime:0.008504s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000724s ]
  8. SELECT * FROM `article` WHERE `id` = 516000 LIMIT 1 [ RunTime:0.000503s ]
  9. UPDATE `article` SET `lasttime` = 1780394774 WHERE `id` = 516000 [ RunTime:0.000761s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000486s ]
  11. SELECT * FROM `article` WHERE `id` < 516000 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000484s ]
  12. SELECT * FROM `article` WHERE `id` > 516000 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000422s ]
  13. SELECT * FROM `article` WHERE `id` < 516000 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.015286s ]
  14. SELECT * FROM `article` WHERE `id` < 516000 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.022831s ]
  15. SELECT * FROM `article` WHERE `id` < 516000 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.013361s ]
0.146907s