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Table 1 Basic Characteristics of Samples

Indicator	Indicator Value	Sample Size	Percentage (%)	Indicator	Indicator Value	Sample Size	Percentage (%)
Gender	男	457	67.01	Education Level	Primary school and below	281	41.20
Gender		女	225		32.99		Junior high school	328	48.20
Age	Under 39 years old	73	10.70			High school and above	73	10.60
		30-50 years old	110	16.12	Household income / 10,000 yuan	Below 1	122	17.89
		50-60 years old	291	42.67			1-4	255	37.39
		60 and above	208	30.51			4-8	220	32.26
						8 and above	85	12.46

Table 2 Variable Selection and Definition

Variables	Symbol	Definition
Control Variable
Basic Characteristics of Farmers
Age	X1	Actual survey value (years)
Education level	X2	0=Illiterate; 1=Primary school; 2=Junior high school; 3=Senior high school; 4=Technical secondary school; 5=Junior college; 6=Undergraduate; 7=Other
Total Population	X3	Actual Surveyed Number (persons)
Number of Migrant Workers	X4	Actual survey figures (persons)
Household economic characteristics
Dependence on cultivated land	X5	Ratio of annual income from cultivated land to total household annual income
Non-farm income	X6	Actual survey value (10,000 yuan)
Agricultural subsidy policies	X7	Includes the sum of direct grain subsidies, superior seed subsidies, agricultural input subsidies, rapeseed subsidies, poverty alleviation fund subsidies, breeding sow subsidies, agricultural machinery subsidies, dilapidated housing subsidies, poverty alleviation and ecological relocation subsidies, and training subsidies, unit (10,000 yuan)
Land Resource Endowment
Total Cultivated Land Area	X8	Actual Survey Value (hm)
Cultivated Land Planting Area	X9	Actual survey value (hm)
Number of plots	X10	Actual survey value (blocks)
Distance	X11	Actual survey value (km)
Basic family security
Household food supply method	X12	1=Fully self-produced, sufficient to eat; 2=Borrow or buy a little, basically enough to eat; 3=Seasonal national food relief; 4=Completely purchased
Housing Access	X13	1=No access; 2=Dirt road access; 3=Gravel road access; 4=Cement road access
Number of Participants in Pension Insurance	X14	Actual survey value (persons)
Number of participants in the new rural cooperative medical system	X15	Actual survey value (persons)
Explanatory variables
Supportive policies
Industrial Assistance	X16	1=Crop Cultivation; 2=Animal Husbandry; 3=Agricultural Processing; 4=Ethnic Handicrafts; 5=Service Industry
Education and Training Assistance	X17	1=Crop Cultivation Training; 2=Animal Husbandry Training; 3=Ethnic Handicrafts Training; 4=Service Industry Training; 5=Other Training
Rural Dilapidated Housing Renovation	X18	1=Renovation of old houses; 2=New construction on original homestead; 3=Application for new homestead to build a house
Ecological Migration	X19	0=No; 1=Yes
Infrastructure Construction	X20	1=Village-level road construction; 2=Group road construction; 3=Production road construction; 4=Ditch construction; 5=Courtyard hardening; 6=Village-level sewage discharge construction;
Explained Variable
Cultivated Land Protection
Quality Protection
Using Farmyard Manure	Y11	0=No; 1=Yes
Growing Green Manure	Y12	0=No; 1=Yes
Constructing irrigation channels	Y13	0=No; 1=Yes
Recycling agricultural film	Y14	0=No; 1=Yes
Straw returning to the field	Y15	0=No; 1=Yes
Land leveling	Y16	0=No; 1=Yes
Quantity Protection
Abandoning Cultivation and Leaving Land Uncultivated	Y21	0=No; 1=Yes
Land reclamation and cultivation	Y22	0=No; 1=Yes
Building houses or roads on contracted land	Y23	0=No; 1=Yes

Table 3 Multicollinearity Diagnostic Results

Variable	Maximum VIF	Mean VIF
Age	1.30		1.99
Education Level	1.26		1.93
Total Population	1.32		2.01
Number of Migrant Workers	1.27		1.91
Arable land dependence	1.31		1.99
Non-agricultural income	1.28		1.90
Agricultural subsidy policies	1.20		1.58
Total arable land area	1.40		2.11
Cultivated planting area	1.36		2.02
Number of plots	1.21		1.46
Distance	1.29		1.71
Household food ration method	1.32		1.89
Housing Access	1.26		1.62
Number of Participants in Pension Insurance	1.44		2.15
Number of Participants in New Rural Cooperative Medical Scheme	1.41		2.16
Industrial Support	1.22		1.48
Education and Training Assistance	1.20		1.40
Rural Dilapidated Housing Renovation	1.23		1.51
Ecological Migration	1.30		1.92
Infrastructure Construction	1.28		1.90

Table4 Estimation Results of Factors Influencing Farmers' Cultivated Land Quality Protection Behavior

Variables	Symbols	Use of farmyard manure		Growing green manure		Straw returning to fields		Recycling agricultural film		Land leveling		Building drainage ditches
Controlling variables
Basic household characteristics
Age	X₁		0.816^**		-0.634		-0.243		0.167		0.271		0.215
Education level	X₂		1.027^**		0.326		1.428^***		1.034^***		2.183^**		0.651
Total population	X₃		0.741^**		0.618^**		0.019		0.215		0.331		0.366^**
Number of migrant workers	X₄		-0.612^*		1.028		0.371		-0.672		0.652		-1.019^**
Household Economic Characteristics
Dependence on Cultivated Land	X₅		0.322		0.771		0.168^**		0.795		0.435		0.733
Non-agricultural Income	X₆		0.497		0.587		-0.523		-0.539		-0.519		0.688
Agricultural subsidy policies	X₇		1.503^***		0.915^**		0.857^*		1.361^**		0.172^*		1.726^**
Resource endowment
Total arable land area	X₈		0.733		0.651		0.633		0.456		0.467		0.117
Cultivated land area	X₉		0.629		0.225^**		0.152^*		-0.332		0.224		0.221
Number of plots	X₁₀		0.281		0.218		0.718		0.215		-0.478^**		0.155
Distance	X₁₁		-1.417^***		0.487		0.485		-0.547		0.044		0.367
Household Infrastructure and Security
Household Food Provision Method	X₁₂		0.659		-0.356		0.110		0.473		0.317		0.688
Housing Access	X₁₃		0.816^***		0.519		0.311		0.398		0.449		0.061
Number of participants in pension insurance	X₁₄		0.734		0.642		0.536		0.561		0.110		0.275
Number of participants in the new rural cooperative medical system	X₁₅		0.852		0.107		0.494		0.604		0.211		0.344
Explanatory variables
Supportive Policies
Industrial Support	X₁₆		-0.322^*		0.003^*		0.299^*		0.736^*		1.076^**		1.256^**
Education and Training Assistance	X₁₇		0.584		0.377		0.725^**		1.045^**		0.523		0.053
Rural Dilapidated Housing Renovation	X₁₈		0.131		0.408		0.511		0.337		0.162		0.322
Ecological Migration	X₁₉		-1.193^***		0.429^*		0.084		-0.523		0.148		0.407
Infrastructure Construction	X₂₀		0.458^**		0.106		0.215		0.382		0.723		0.877
Constant	A		9.816		3.755		5.623		1.339		-3.415		-6.549
Observation Indicators	a		69.522		47.063		58.248		134.170		40.860		87.443
		b		0.046		0.220		0.092		0.085		0.066		0.305
		c		0.129		0.164		0.151		0.180		0.201		0.192

Note: ***, **, and * indicate significance at the 1%, 5%, and 10% levels respectively; a represents the -2LL value (-2 Log likelihood), b is the Cox & Snell R Square value, and c is the Nagelkerke R Square value.

Table 5 Estimation Results of Factors Influencing Farmers' Cultivated Land Quantity Protection Behavior

Variable	Symbol	Abandoning farmland and leaving it uncultivated	Reclaiming wasteland for cultivation	Building houses and roads on contracted land
Control variables
Basic household characteristics
Age	X₁	-0.341	0.104	-0.145
Educational Attainment	X₂	-0.268	-1. 632^**	-0.211
Total Population	X₃	0.174	0.527	0.691^**
Number of migrant workers	X₄	1.612^**	-1.415^**	0.437
Household economic characteristics
Arable Land Dependence	X₅	-1.291^***	0.671	-0.668^**
Non-agricultural Income	X₆	0.497	0.783	-0.523^**
Agricultural subsidy policies	X₇	0.583	0.022^**	-0.352
Land resource endowment
Total cultivated land area	X₈	0.633	0.351	0.436
Cultivated planting area	X₉	-0.162	0.195	0.022
Number of plots	X₁₀	0.181	0.218	0.018
Distance	X₁₁	-1.017^**	-0.887	-0.405^*
Household infrastructure and security
Household food rationing method	X₁₂	0.754	0.466	0.330
Housing access	X₁₃	0.016	0.019	-0.711^**
Number of participants in pension insurance	X₁₄	0. 374	0.342	0.064
Number of participants in the new rural cooperative medical scheme	X₁₅	0.255	0.437	0.049
Explanatory variables
Assistance Policies
Industrial Support	X₁₆	-0.728^**	0.174^**	0.297^*
Education and Training Assistance	X₁₇	0.284	0.377	0.025
Rural Dilapidated Housing Renovation	X₁₈	0.033	0.033	0.751
Ecological Migration	X₁₉	2.106^***	0. 167	0.084
Infrastructure Development	X₂₀	-0.372^**	0.155	1.013^**
Constant	A	3.617	3.378	2.143
Observation Indicators	a	37.040	83.191	62.721
		b	0.031	0.270	0.492
		c	0.104	0.124	0.175

Note: ***, **, and * indicate statistical significance at the 1%, 5%, and 10% levels, respectively; a represents the -2LL value (-2 Log likelihood), b is the Cox & Snell R Square value, and c is the Nagelkerke R Square value.

Table 6 Estimation Results of Factors Influencing Farmland Quality Protection Behavior After Excluding Outliers

Explanatory Variables

Symbol

Using farmyard manure

Growing green manure

Straw returning to the field

Recycling agricultural film

Land leveling

Constructing drainage ditches

Supportive policies

Industrial Assistance

X₁₆

-0.331^*

0.101^*

0.302^*

0.437^*

1.607^**

1.573^**

Education and Training Support

X₁₇

1.009

0.526

1.375^**

1.741^**

1.057

0.861

Rural dilapidated housing renovation

X₁₈

0.040

0.512

0.311

0.176

0.097

0.625

Ecological migration

X₁₉

-3.677^***

0.530^*

0.104

-0.791

0.083

0.261

Infrastructure construction

X₂₀

1.792^**

0.007

0.005

1.035

2.127

3.042

Table 7 Estimation results of influencing factors on farmers' cultivated land quantity protection behavior after excluding extreme values

Explanatory variable	Symbol	Abandonment of cultivated land	Land reclamation and cultivation	Contracting land for building houses and roads
Support policies
Industrial assistance	X₁₆	-3.671^**	2.050^**	0.185^*
Education and Training Assistance	X₁₇	3.207	0.871	0.422
Rural Dilapidated Housing Renovation	X₁₈	0.033	0.033	0.751
Ecological Migration	X₁₉	4.271^***	0.010	0.260
Infrastructure Construction	X₂₀	-2.011^**	0.703	2.931^**

Table 8 Estimation Results of Factors Influencing Farmers' Cultivated Land Quality Protection Behavior Using Variable Substitution

Explanatory Variables

Symbol

Use of Farmyard Manure

Growing green manure

Straw returning to fields

Recycling agricultural film

Land leveling

Constructing drainage ditches

Supportive policies

Industrial assistance

X₁₆

-2.570^*

0.021^*

0.311^*

2.466^*

3.170^**

2.841^**

Education and Training Assistance

X₁₇

1.082

0.143

1.518^**

0.994^**

0.361

0.622

Rural Dilapidated Housing Renovation

X₁₈

0.099

0.592

0.071

0.221

0.192

0.270

Ecological Migration

X₁₉

-4.287^***

0.007^*

0.180

-0.633

0.254

0.703

Infrastructure Construction

X₂₀

3.161^**

0.084

0.155

0.712

1.621

2.654

Table 9 Estimation Results of Factors Influencing Farmers' Cultivated Land Quantity Protection Behavior Using Variable Substitution

Explanatory Variables	Symbol	Abandoned farmland	Reclaiming wasteland for cultivation	Constructing buildings and roads on contracted land
Support policies
Industrial Support	X₁₆	-2.611^**	0.287^**	0.305^*
Education and Training Assistance	X₁₇	0.192	0.284	0.141
Rural Dilapidated Housing Renovation	X₁₈	0.149	0.177	0.560
Ecological Migration	X₁₉	2.913^***	0.044	0.166
Infrastructure Construction	X₂₀	-1.952^**	0.369	1.218^**