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黄淮海平原的沙地立地条件差,防风固沙林和农田防护林常因生长不良而达不到预期的防护作用,难以消除风蚀对农业生产的影响。在白榆人工林内进行的农林间作试验表明:不同的间作类型和不同的间作年限,均对防风固沙林的生长有显著影响;连续间作1～5年,林木年均高生长可提高40.43％～78.7％,胸径年均生长量可提高25.71％～89.11％,一般连续间作3～4年,林木即可进入稳定生长期,而以造林后的前两年作用最大;不同的间作物作用不同,比较理想的间作物是油菜、花生、豆类等低秆作物。
Due to the poor site conditions of sandy land in the Huang-Huai-Hai Plain, wind-blown sand-fixing forests and farmland shelter forests often fail to achieve the expected protective effect due to poor growth and it is difficult to eliminate the impact of wind erosion on agricultural production. Experiments in the intercropping of Agkistrodon and Ulmus pumila plantations showed that different intercropping types and different intercropping periods had a significant effect on the growth of the Aeolian and sand-fixing forests. The average annual growth of the forest trees could be increased by 40.43% ~ 78.7 %, Average annual growth of breast diameter can be increased by 25.71% ~ 89.11%, usually for intercropping for 3 ~ 4 years, trees can enter the stable growth period, but the role of the first two years after afforestation the most; different inter-crop differences in the role of different The ideal crop is rape, peanut, beans and other low-stalk crops.