一、引言在发展国民經济以农业为基础的方針指导下,林业上实行“以林为主,林粮并举”的方針,是林业为农业服务,促进农业生产发展的具体体现。大面积的林粮間作是我国劳动人民的伟大創造,它既能增产粮食,又能提高造林质量,降低造林成本。这的确是一个一举两得的好办法,大力开展林粮间作是有其深远的政治意义和經济意义的。要想获得林粮双丰收,必須深入研究林粮间作群体結构以及影响林粮間作群体結构的 I. INTRODUCTION Under the guideline of developing agriculture-based national economy, forestry implements the principle of “taking forests as the mainstay and forests serving both foods and grains”. It is a concrete manifestation of the forestry service for agriculture and the promotion of agricultural production. Large-scale forest-grain intercropping is a great creation for the working people in our country. It not only increases grain output, but also improves the quality of afforestation and reduces the cost of afforestation. This is indeed a good way to deal with each other’s needs. It is far-reaching political and economic significance to vigorously carry out inter-crop forestry cooperation. In order to obtain the double harvest of forest and grain, it is necessary to study in depth the structure of the intercropping system of forest and grain crops and the group structure