论文部分内容阅读
结合贵州第一期世行贷款造林，在黎平县中潮长岭营建世行贷款国家造林项目杉木试验示范林88hm2，推广面积8000hm2，试验内容包括：杉木幼林施肥效果；杉木林地土壤肥力监测；杉木不同施肥时间效果；示范内容包括：杉木优良家系；杉木优良种源和杉木优良无性系示范林，试验示范结果表明：1．施肥效果以NP2K1处理的生长量最大，施肥后4年，树高生长量比无肥对照大42．4％；胸径大34．2％，NP1和P2处理分列第2，3位，树高和胸径分别比对照大32.3％，27．1％和32．0％，25％；2．杉木施肥和林地土壤肥力监测结果表明，施肥后土壤的理化性质得到了明显的改善，施肥后第2年，P2和P2K1处理与对照相比土壤的含P量，分别比对照提高了12％和21％，施肥第4年，土壤的含P量分别大25％和28％；P2K1处理的速效和缓效K含量比对照大21％畅和29％；造林后杉木土壤肥力随着林龄的增加呈逐年下降的趋势；造林5年后，距离树干40cm的N、P、K肥下降比例较距树干80cm的为慢；3．施肥时间以造林时一次性施入200g／株钙镁磷肥生长量最大，与无肥对照相比，树高和胸径第4年分别提高38．7％和32．1％，B（Pb）处理次之，经L、S、D多重比较，P肥效应显著大于N和K肥的效应；4．采用优良的杉木栽植材料造林，具有显著的增产效果，与对?
In combination with the first phase of World Bank Loan Afforestation in Guizhou Province, 88 hm 2 fir demonstration forest for World Bank Loan Afforestation Project was popularized in the mid-tidal Changling of Liping County and the popularization area was 8000hm2. The experiment contents include: fertilization effect of young Chinese fir plantation; soil fertility monitoring of Chinese fir plantation; Fertilization time effect; Demonstration includes: Chinese fir elite families; Cunninghamia lanceolata provenance and Chinese fir clonal model forest demonstration results show that: 1. NP2K1 treatment had the highest growth rate. After 4 years of fertilization, the height growth of the tree was 42.4% larger than that of the non-fertilizer control. The DBH was 34.2%. The NP1 and P2 treatments ranked the 2nd and 3rd and the tree height And DBH were 32.3%, 27.1% and 32.0%, 25% higher than the control respectively. Results of Chinese fir fertilization and woodland soil fertility monitoring showed that soil physical and chemical properties were significantly improved after fertilization. In the second year after fertilization, soil P contents of P2 and P2K1 treatments were increased by 12% 21%, and the fourth year of fertilization, the P content of soil was 25% and 28% higher than that of the control respectively. The contents of available and slow-acting K in the treatment of P2K1 were 21% and 29% Showed a declining trend year by year. After 5 years of afforestation, the proportion of N, P, and K declined 40 cm from the trunk was slower than that of the trunk 80 cm. Fertilization time of one-time application of afforestation 200g / plant Ca-Mg phosphate maximum growth compared with no-fertilizer control, tree height and DBH increased 4 years 38.7% and 32.1%, B (Pb) The second, by L, S, D multiple comparisons, P fertilizer effect was significantly greater than N and K fertilizer effect; 4. Afforestation using fine fir planting material, with a significant increase in yield, and right?