基于2020年中国乡村振兴综合调查数据，运用内生转换模型实证检验农户的土地经营规模对农社交易关系的影响以及不同类型交易关系下的合作社增收效应。结果表明：土地经营规模会显著促进农户选择松散型和紧密型交易，而对准一体化交易的影响并不显著，且其影响会因农户家庭人力资本、所在村庄集体行动能力和村庄地形而具有明显的异质性。合作社增收效应与农社交易关系之间并非简单的线性关系，在紧密型交易关系下合作社具有明显的增收效应，在松散型交易关系下增收效应并不明显，在准一体化交易关系下增收效应反而会受到抑制。不同农社交易关系的合作社增收效应在不同家庭人力资本农户中没有显著差异；对于村庄集体行动能力较弱的农户，松散型交易关系下的合作社增收效应会受到抑制；对于非平原地区的农户，紧密型交易关系下的合作社增收效应较明显。

Based on the comprehensive survey data of China rural revitalization in 2020, the impact of farmers’ land management scale on the transaction relationship between farmers and cooperatives, and the income-increasing effect of cooperatives in different types of transaction relationship have been tested empirically by using the endogenous transformation model. The results show that the scale of land management significantly promotes farmers’ choices of loose and close transactions, but it has no significant effect in quasi-integrated transactions. Meanwhile, the influence shows an obvious heterogeneity according to the human capital of the peasant household, the collective action ability of the village and the village topography. The relationship between the income-increasing effect of cooperatives and the transaction relationship between farmers and cooperatives is not a simple linear relationship: Cooperatives have an obvious income-increasing effect in close transaction relationship but no obvious income-increasing effect in loose transaction relationship while their income-increasing effect would be inhibited in quasi-integrated transaction relationship. The income-increasing effect of cooperatives with different transaction relationship between farmers and cooperatives is not significantly different among farmers with different family human capital. For rural households with weak village collective action ability, the income-increasing effect of cooperatives would be restrained in loose transaction relationship while for rural households in non-plain areas, the effect would be more obvious in close transaction relationship.

F321.42；F323.8

国家自然科学基金项目（72173001）；教育部人文社会科学研究一般项目（21YJA790012）