当前位置:首页>南京>【专家视角】中国科学院南京地理与湖泊研究所NCC|全球河岸带的人类印记:基于深度学习的首张高分辨率地图揭示近20%河岸已被改造

【专家视角】中国科学院南京地理与湖泊研究所NCC|全球河岸带的人类印记:基于深度学习的首张高分辨率地图揭示近20%河岸已被改造

  • 2026-08-03 19:00:48
【专家视角】中国科学院南京地理与湖泊研究所NCC|全球河岸带的人类印记:基于深度学习的首张高分辨率地图揭示近20%河岸已被改造

河流不仅是地球水循环的关键组分,更是人类社会与自然生态的交汇枢纽。然而,沿河岸带(riverfronts)的人类活动强度及其全球分布,此前缺乏系统性量化。本研究利用近870万景米级卫星影像和卷积神经网络,绘制了全球752万公里河岸带的高分辨率土地利用图,分类精度达93%。结果显示,全球约19.72%的河岸带已被人类改造,其中农业用地占13.43%,人工建成区占6.29%。改造热点集中在一条横跨北非、欧洲、西亚、南亚和东亚的“低中纬度亚欧非走廊”(LAEC),该区域集中了全球约60%的人为改造河岸带,其改造密度为其他地区的6倍。研究进一步揭示了河岸带横向破碎化对水质和生物多样性的显著负面影响,其影响范围约为大坝所致纵向破碎化的两倍。该成果为全球河流管理提供了关键基础数据。

1 科学问题

河岸带是连接水陆生态系统的动态过渡区,承担着污染物过滤、河岸稳定、物种迁徙廊道等关键功能。然而,以往全球尺度的河流评估多聚焦于大坝造成的纵向碎片化,而对河岸带横向人类活动(农业扩张、城镇化、工业设施)的关注严重不足。现有的全球土地覆盖数据集空间分辨率有限,难以捕捉河岸带狭窄且异质性强的特征;传统像素级分类方法也受制于局部景观变异和河段定义不一致。因此,一个全球一致、高精度的河岸带人类印记地图,是评估河流生态完整性、制定保护策略的必要前提。

2 研究方案

研究团队首先基于2019—2021年所有可用的Sentinel-2影像,计算水体出现频率,以10%阈值提取最大观测洪泛范围,并结合SWORD和GRIT河网数据集进行空间约束,经人工逐段校验,构建了全球河岸带水陆边界数据集(GROUD),涵盖宽度大于30米的河流,总河岸线长度752万公里。随后,以1公里为河段单元,在河岸两侧各500米缓冲区内,利用2018—2023年Google Earth和ESRI高分辨率(约2米)影像裁剪出256×256像素的样本斑块。通过人工标注近20万斑块(六类:人工、农业、林地、草地/苔原、半裸露、裸露),训练并比较六种卷积神经网络架构,最终选用EfficientNet V2 B3模型,实现全局分类。在此基础上,构建了“连续性指数”量化河岸带横向破碎化,并与大坝造成的纵向破碎化(基于已有DOF指标)进行对比,同时结合全球水质数据集(DynQual)和IUCN濒危物种名录,分析人类印记的生态关联。

3 结论

全球格局:自然河岸带中,林地占比最高(43.27%),其次为半裸露(16.03%)、草地/苔原(14.95%)和裸露(6.03%)。人为改造带中,农业河岸带长度约为人工建成区的2.14倍(全球平均),但古代文明流域(如印度河、黄河)该比值更高(2.74—4.11),显示农业主导性更强。

空间聚集:LAEC走廊仅占全球陆地面积约12.58%,却容纳了60.34%的人为改造河岸带,其农业和人工占比分别达41.33%和18.48%,显著高于其他区域。

驱动因素:国家尺度的“河岸带依赖度”与水资源缺口显著正相关(r=0.60),干旱和半干旱地区人类活动更倾向于聚集在河岸带;而部分南美国家则因沿海产业布局,人类活动反而远离河流。

破碎化:全球河岸带连续性指数平均为53.77%,但在LAEC仅剩13.54%。农业主导流域的连续性(45.43%)低于人工主导流域(67.36%),表明农业扩张对廊道割裂作用更强。横向破碎化影响的河长约为纵向破碎化的3.6倍,影响土地面积约为1.9倍,表明人类对河岸带的改造更集中于高等级河网,生态影响更为广泛。

水质与生物多样性:LAEC内河流的总溶解固体和生化需氧量显著高于外部。在控制气候、地形、人口等协变量后,横向破碎化仍与水质恶化呈正相关。全球受威胁淡水两栖类(2639种)和鱼类(2854种)中,LAEC内分别占34.02%和29.01%(共1152种)。横向改造主导区域对两栖类威胁更突出,纵向大坝对鱼类威胁更显著,两者叠加时受威胁比例进一步上升。目前全球仅8.81%河岸带受保护,LAEC内仅0.92%,保护缺口巨大。

不足与展望

本研究聚焦于宽度大于30米的河流,未涵盖小型溪流和季节性河流,可能低估了人类活动对全部水网的干扰。500米缓冲区虽经敏感性测试,但不同生态过程(如污染物截留、物种迁徙)对缓冲宽度需求各异,未来可结合具体功能进行多尺度分析。此外,分类体系中的“农业”与“人工”均为人类主导,但两者对生态过程的影响机制不同,后续可进一步细分(如灌溉农业、水产养殖、港口工业)。当前水质和生物多样性关联为空间统计相关性,因果关系仍需结合时间序列和实验研究验证。随着更高分辨率遥感数据与更长时序的积累,动态监测河岸带变化、评估保护措施成效将成为可能,为实现河流生态系统的“横向—纵向”一体化管理提供科学支撑。

文章来源:生态环境科学

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  1. CONNECT:[ UseTime:0.000876s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001255s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.009330s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000652s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001354s ]
  6. SELECT * FROM `set` [ RunTime:0.000548s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001368s ]
  8. SELECT * FROM `article` WHERE `id` = 601916 LIMIT 1 [ RunTime:0.000941s ]
  9. UPDATE `article` SET `lasttime` = 1785856454 WHERE `id` = 601916 [ RunTime:0.027363s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000666s ]
  11. SELECT * FROM `article` WHERE `id` < 601916 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001184s ]
  12. SELECT * FROM `article` WHERE `id` > 601916 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001365s ]
  13. SELECT * FROM `article` WHERE `id` < 601916 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001805s ]
  14. SELECT * FROM `article` WHERE `id` < 601916 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003867s ]
  15. SELECT * FROM `article` WHERE `id` < 601916 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.017222s ]
0.228423s