Table 4 Dual-factor Interaction Outcome types.

From: Spatiotemporal evolution and driving factors of ecosystem service value in the Upper Minjiang River of China

Judgment Basis

Interaction Type

q(X1\(\cap\)X2) < Min(q(X1),q(X2))

Non-linear weakening

Min(q(X1),q(X2)) < q(X1\(\cap\)X2) < Max(q(X1),q(X2))

Single-factor non-linear weakening

q(X1\(\cap\)X2) > Max(q(X1),q(X2))

Dual-factor enhancement

q(X1\(\cap\)X2) = q(X1) + q(X2)

Independent

q(X1\(\cap\) X2) > q(X1) + q(X2)

Non-linear strengthening

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