中国降水带北移 现象、影响与未来二十年展望

flowchart TD A["降水带北移"] --> B["北方地区降水增加"] A --> C["南方地区降水减少"] B --> D["植被覆盖度提升"] B --> E["水源涵养能力增强"] B --> F["土壤保持功能改善"] C --> G["植被生长受抑制"] C --> H["水源涵养能力下降"] C --> I["生态系统压力增大"] D --> J["生物多样性增加"] E --> K["水资源供给提升"] F --> L["土地荒漠化遏制"] G --> M["物种丰富度降低"] H --> N["水资源短缺风险"] I --> O["极端天气敏感性增加"] classDef northNode fill:#e8f5e8,stroke:#4ade80,stroke-width:3px,color:#166534,font-weight:600 classDef southNode fill:#fef3e8,stroke:#f59e0b,stroke-width:3px,color:#92400e,font-weight:600 classDef inputNode fill:#dbeafe,stroke:#60a5fa,stroke-width:3px,color:#1e40af,font-weight:700 classDef default fill:#f8fafc,stroke:#64748b,stroke-width:2px,color:#1e293b,font-weight:500 class A inputNode class B,D,E,F,J,K,L northNode class C,G,H,I,M,N,O southNode

graph LR A["传统种植带"] --> B["气候变化"] B --> C["北移后的种植带"] A --> D["水稻：南方为主"] A --> E["小麦：北方为主"] A --> F["大豆：东北地区"] C --> G["水稻：北移25公里"] C --> H["小麦：北移100-200公里"] C --> I["大豆：北移101公里"] D --> J["种植界限变化"] E --> J F --> J G --> J H --> J I --> J classDef traditional fill:#fef3c7,stroke:#f59e0b,stroke-width:3px,color:#92400e,font-weight:600 classDef climate fill:#dbeafe,stroke:#60a5fa,stroke-width:3px,color:#1e40af,font-weight:700 classDef new fill:#e8f5e8,stroke:#4ade80,stroke-width:3px,color:#166534,font-weight:600 classDef result fill:#fce7f3,stroke:#f472b6,stroke-width:3px,color:#be185d,font-weight:700 classDef default fill:#f8fafc,stroke:#64748b,stroke-width:2px,color:#1e293b,font-weight:500 class A traditional class B climate class C new class J result