丝栗栲林生长与生产力的研究

来源 :林业科学研究 | 被引量 : 0次 | 上传用户:snoopy_cp
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在福建省邵武市洪墩采育场,调查丝栗栲林标地10块,做平均木、树干解析木9株,杉木人工林标地2块,研究丝栗栲的生长与生产力,结果表明:丝栗栲林的胸径、树高及单株材积总生长量,均随年龄的增加而增加;胸径20a前生长最快;树高16a前生长最快;材积36a时尚未有下降的趋势。胸径、树高平均生长量,随年龄增加而增加,当生长量达高峰后,则随年龄的增加而下降;胸径生长高峰,好立地12a,中、劣立地15a;树高生长高峰,好立地10a,中立地8a,劣立地12a;材积平均生长量,随年龄增加而增加,好、劣立地36a时仍未下降,中立地34a时生长量最大。胸径、树高连年生长量随年龄增加而下降;材积连年生长量,随年龄增加而增加,当生长量达高峰后,则随年龄增加而下降,生长高峰出现的年龄,好立地28a,中立地22a,劣立地26a。在相似的立地条件下,丝栗栲林的蓄积量比杉木人工林低,但乔木层总生物量比杉木林高。 In Hongdun mining site of Shaowu City, Fujian Province, 10 sites of Castanopsis fargesii were surveyed, 9 were average woods, 9 were tree-resolving woods, 2 were fir plantations, and their growth and productivity were studied. The results showed that The DBH, tree height and volume per plant of DBH all increased with increasing age. DBH had the fastest growth before 20a, the fastest growth before tree height 16a, and no trend of decrease in volume 36a. The DBH and tree height average growth increased with the increase of age. When the growth reached its peak, the DBH decreased with increasing age. The DBH growth was at 12a, middle and poor stands, 10a, neutral 8a, inferior stand 12a; average volume growth, with increasing age, good, poor ground 36a did not decline, the maximum amount of growth in the neutral 34a. DBH and tree height in successive years decreased with increasing age. The annual growth of volume increased with age. When the growth reached its peak, it decreased with increasing age, and the age at which the growth peak appeared was 28a. Neutral 22a, poor ground 26a. Under similar site conditions, the stock volume of Castanopsis fargesii was lower than that of Chinese fir plantation, but the total biomass of herbage layer was higher than that of Chinese fir plantation.
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