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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