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Table 1 Description of the variables

From: Exploring the influencing factors of continuous crop residue supply: from the perspective of a sustainable and bioenergy-oriented crop cultivation

Variables Mean St. dev Max Min Expected impact Definition
SSC 5.12 2.53 8.5 0.83 / CRS sustainability coefficient
14.87 5.03 26.01 3.84 + Temperature
2 235.71 145.81 649.12 23.07 Temperature squared term
PSC 50.07 41.54 142.52 2.34 + Planting scale (million/ha)
PST 14.17 7.91 36.6 1.9 Planting structure (%)
FS 1.26 0.37 2.52 0.66 + Multiple-crop index
SDI 0.71 0.11 0.86 0.45 + Simpson Diversity Index
EP 2.75 1.24 6.71 1.05 Energy pressure
TGP 0.53 0.51 1 0 + Topography
EDL 0.33 0.47 1 0 Economic development level