马尾松优良种源对初植密度的早期生长反应
Early Growth Response of Super ior Provenance ofMa sson Pine to D ifferent Planting Den sities
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摘要: 在马尾松中心产区之一的闽西地区,利用5个马尾松优良种源在肥力中等立地上设置的种源与密度互作9年生试验林测定材料,初步研究优良种源生长对初植密度的反应式样和互作效应。结果表明, 5个参试优良种源对初植密度的反应差异很大,江西崇义和福建武平种源生长对初植密度反应敏感,广西岑溪和广东高州种源生长对初植密度反应较小,而广东信宜种源的生长反应则一般。比较分析发现,广西岑溪、广东高州、广东信宜3个南部种源在1. 5 m ×2. 0 m初植密度下树高和胸径生长量大、单位面积蓄积量高,适宜较高初植密度短周期经营,但也可在2. 0m ×2. 5 m较稀初植密度下实现大径材培育目标。江西崇义和福建武平两个中部种源在2. 0 m ×2. 0 m中等初植密度下生长表现最好。马尾松种源生长分化与初植密度有关,在较密和较稀初植密度下种源生长分化较大,密植似可提高早期选择效果。研究还发现,种源×初植密度、区组×种源×密度互作显著,应针对不同立地和种源设计不同的初植密度,实现优良种源与初植密度的优化配置。Abstract: A p rovenance-by-p lanting density-interaction trial ofmasson p ine at age nine on mid2fertility field inWuping of Fujian was used to investigate growth response pattern of five superior p rovenances to initial p lanting density.Results showed that the growth response to p lanting density varied largelywith p rovenances tested. Chongyi of J iangxi andWup ing of Fujian were the p rovenances with higher sensitivity to p lanting density, while Cenxi of Guangxiand Gaozhou of Guangdong were the p rovenanceswith less sensitivity to p lanting density, and the growth sensitivityof Xinyi of Guangdong to p lanting densitywas found to be moderate. Analysis indicated that three south p rovenancesincluding Cenxi of Guangxi, Gaozhou and Xinyi of Guangdong were suitable for short rotation management underhigh p lanting density of 1. 5 m ×2. 0 m with high growth increment of height, DBH and timber volume per area, andwere also fit for low p lanting density of 2. 0 m ×2. 5 m to cultivate big-diameter timber. Both p rovenances ofChongyi of J iangxi andWup ing of Fujian exhibited well atmoderate p lanting density of 2. 0 m ×2. 0 m. Growth dif2ferentiation among p rovenanceswas found to be related to initial p lanting density and to be great under high or lowp lanting density. Early selection of p rovenances seemed to have great efficiency under higher p lanting density. Itwasalso showed that p rovenance ×density interaction and block ×p rovenance ×density interaction were remarkable,thus different p lanting densitieswere needed according to different soils and different p rovenances for op timizing thelayout of superior p rovenances and p lanting density.
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