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通过对前期定位试验点进行继续观察,分析改造措施的合理性,评价拍木低效林改造的效益,根据林分演化规律,提出柏木低效林改造后续经营的技术措施。结果表明:①柏木低效林改造七年来效益显著,各种改造措施均能有效地改善林地土壤理化性质,增强森林保持水土、涵养水源的功能。改造区土壤侵蚀得以高度缓解直至彻底遏制,侵蚀模数已下降至500-2000t/(a.km2)。②各种改造措施对恢复和提高森林水土保持功能的效应以补植封山效果最佳,其次是补播封山,单纯封山再次,经济林改造相对较差。大面积低效林改造,应以人工补植、补播方式为主,进行复层经营,然后加以全面封山管理,积极开展抚育间伐,加强森林防火及病虫害防治。③柏木低效林改造后生态价值、经济价值显著提高,同时也发挥着重要的社会效益。
Through the continuous observation of the previous positioning test points, the rationality of the transformation measures was analyzed, the effectiveness of the transformation of the low-efficiency forest of paddy wood was evaluated, and the technical measures for the follow-up management of the low-efficiency forest for almond restoration were proposed according to the evolution law of the forest. The results showed that: (1) There are significant benefits in the transformation of low-efficiency forest in Kashiwagi for seven years. All kinds of improvement measures can effectively improve the physical and chemical properties of forest soil and enhance the function of forest to maintain soil and water and conserve water. Soil erosion in the improved area was highly mitigated until it was completely contained and the erosion modulus had dropped to 500-2000 t / (a.km2). ② The effects of various rehabilitation measures on restoring and improving the functions of soil and water conservation in forests are the best replanting and closing mountain closure, followed by seeding up and closing off the mountain and closing down the mountain again, the transformation of economic forest is relatively poor. The transformation of large-scale and low-efficiency forests should be based on artificial replanting and replenishment. Multi-layer management should be carried out and then a comprehensive closure management should be carried out to promote tending of thinning and forest fire prevention, pest and disease control. ③ After the transformation of Kashiwagi inefficient forest ecological value, economic value increased significantly, but also play an important social benefits.