作物种植专业化与化肥减量来源——兼顾经营规模的影响
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曾琳琳, 李晓云, 杨志海
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Crop specialization and chemical fertilizer reduction: The pathway of operation scale
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ZENG Lin-lin, LI Xiao-yun, YANG Zhi-hai
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表5 作物种植专业化对化肥减量的影响：稳健性检验
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Table 5 The impact of crop specialization on fertilizer reduction: Robustness test
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| 变量 | （1）替换核心自变量 | （2）粮食作物 | （3）经济作物 | | 施用强度的影响 | | | | | | | | | | 横向专业化 | -0.011***
(0.003) | — | -0.004*
(0.002) | — | — | -0.017***
(0.002) | — | — | | 纵向专业化 | — | — | — | -0.019***
(0.002) | — | — | -0.025***
(0.003) | — | | 横向专业化×纵向专业化 | — | -0.019***
(0.007) | — | — | -0.0005***
(0.000) | — | — | -0.0003***
(0.000) | | 常数项 | 1.417***
(0.070) | 0.591**
(0.247) | 1.511***
(0.121) | 1.217***
(0.066) | 0.928***
(0.161) | 2.520***
(0.178) | 1.244***
(0.0693) | 1.898***
(0.191) | | 观测值/个 | 507 | 507 | 507 | 507 | 507 | 507 | 507 | 507 | | R2 | 0.891 | 0.905 | 0.889 | 0.904 | 0.910 | 0.901 | 0.902 | 0.909 | | 利用效率的影响 | | | | | | | | | | 横向专业化 | 0.031***
(0.003) | — | 0.012***
(0.003) | — | — | 0.021***
(0.003) | — | — | | 纵向专业化 | — | — | — | 0.036***
(0.003) | — | — | 0.046***
(0.004) | — | | 横向专业化×纵向专业化 | — | 0.276**
(0.130) | — | — | 0.0008***
(0.000) | — | — | 0.0007***
(0.000) | | 常数项 | 3.202***
(0.104) | 54.50***
(12.63) | 2.953***
(0.176) | 3.669***
(0.084) | 3.546***
(0.605) | 2.005***
(0.269) | 3.621***
(0.092) | 2.767***
(0.847) | | 观测值/个 | 507 | 507 | 507 | 507 | 507 | 507 | 507 | 507 | | R2 | 0.726 | 0.652 | 0.689 | 0.765 | 0.786 | 0.710 | 0.753 | 0.775 |
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