板栗低产林改造及增产途径试验

Improvement Techniques for Low-yield Chestnut Plantations

通过对低产栗林的本底调查和成因分析,划分出4种低产林类型,分别选择不同改造方式。通过7年来的品种更新、密度调整、树体改造和林分扶壮等综合技术措施应用,改造规模35 hm2,改造后第5～7年年均产量达2046 kg·hm-2,是改造前的3～6倍,其中新造更新类型单产1974 kg·hm-2,换接改造类型单产2119kg·hm-2,实现了栗林丰产稳产和优质丰收,栗林经济效益显著提高。

Based on background investigation and cause analysis, four types of low - yield chestnut plantations were defined, and the different techniques were chosen to improve them. To do so, a total area of 35 hm2 of the chestnut plantations were reconstructed with omprehensive technological methods were applied including renovation of variety, density adjustment, reconstruction of tree form, and improvement of forest stand. As the results, the mean outputs per year reached 2046 kg？ hm - 2 in the fifth to seventh years after reconstruction, being 3 to 6 folds of the ones before; the yield per reached 2119 kg？ hm - 2. with high quality, and the unit area of the regenerating type reached 1974 kg？ hm- 2 and that of grafting Therefore, the used approaches had promised that chestnut forest has high -stable economic benefit of chestnut forest was significantly enhanced. type yield