立地管理对第2代杉木4年生人工幼林生长影响的研究

A Study on the Influence of Site Management Measures on the Growth of Four-year-old Chinese Fir Plantation of Second-generation

为研究不同立地管理方式对多代经营杉木人工林生产力的影响 ,在 1代杉木采伐迹地上用 5种林地处理方式进行 2代杉木人工林营造 ,试验表明 :(1)BL3BM0 (收获树干和树皮、加倍采伐剩余物 )处理方式对 4年生 2代杉木林的生长最为有利 ,对降低土壤容重和提高土壤pH值的作用最大 ,是最佳的立地管理措施 ;(2 )BL1BM0 (清理树木的所有部分 )处理生长最慢 ;(3)BL0 BM0 (清除地上所有有机质 )处理的杉木在 1～ 2年生时生长为次好 ,但对土壤肥力的维持最为不利 ,3年生后杉木生长略为落后 ;(4)BL2 BM1(商业性收获加炼山 )处理的杉木生长比BL2 BM0 (商业性收获 )的略好 ,但未达到差异显著水平 ;(5 )采伐剩余物分解至质量残留 5 0 %的时间需要 2 0个月 ,估计分解至质量残留 5 %需要

Aimed at studying the influence of various patterns of site management on the productivity of Chinese fir ( Cunninghamia lanceolata ) plantation for generations, the second generation C. lanceolata plantation was established with 5 kinds of site preparation patterns on the cleared area of first generation C. lanceolata . The results showed that: (1) The pattern IV (Double slash) had the most benefits to the growth of 4 year old C. lanceolata of second generation, and had the most effects on reducing soil bulk specific gravity and raising soil pH value. This is the best site management pattern. (2) The pattern II (Whole tree harvest) was the worst. (3) The pattern I (No slash) had positive effect on the growth of C. lanceolata in 1 2 years after planting, but it had negative effect on soil fertility maintenance. (4) The pattern V (Stem and bark harvest + burning) was better than the pattern III (Stem + bark harvest), but the difference is not significant. (5) It is estimated that it will take about 90 months for the harvest residual to be decomposed to the 5% of the weight remains.