水肥耦合对油松生态林林木生长的影响

ue to the poor soil water supply in the sandy land of Beijing plain, the growth status of Pinus tabulaeformis ecological forest after afforestation is generally poor. In order to explore the effects of irrigation and application of organic fertilizer on the growth of P. tabulaeformis. The split area experiment design method was adopted in this study. Three irrigation levels and three application amounts of organic fertilizer of garden waste were selected for comparative experiment. The effects of different treatments on the growth of P. tabulaeformis forest were studied by measuring the height, DBH, chlorophyll and leaf nutrient content indexes of P. tabulaeformis forest. The results were as follows: (1) Irrigation can significantly improve the growth index of P. tabulaeformis in DBH, tree height, physiology and other aspects, and the promotion effect of tree height and DBH under medium amount irrigation (A2) is even higher than that under high water (A3) treatment. (2) One year after fertilization, fertilization had a significant effect on the growth of P. tabulaeformis, but there was no significant differences among the three fertilization levels. (3) After one year of fertilization, there was no significant interaction between irrigation and organic fertilizer application. Fertilization and irrigation can significantly promote the growth of P. tabulaeformis. From the perspective of the effect of fertilization and comprehensive consideration of resource utilization efficiency, it is an economic andeffective management and protection measure for P. tabulaeformis ecological forest to apply a small amount of organic fertilizer and drip irrigation in the growing season (April September) with the amount of 80 L(10 d plant time)-1.