The changes about geomorphic processes, physical flux(such as water, sand and so on)and chemical flux(such as C, P, N and so on) are the links among each subsystem.

• 地貌过程变化，水、沙等物理通量变化，C、P、N等化学通量变化是系统内各子系统之间联系的纽带，也是流域环境系统中最活跃的因子。