摘要
用４种不同整地方式（撩壕带状、水平带状、全垦、块状）１７ａ的试验资料，分析了整地对林木各种生长的影响；用贴现方法，比较了不同整地方式的经济效益。结果表明：整地方式对杉木各种连年生长量的影响，一般在７～１０ａ消失；对平均高、胸径和单株材积的影响，主要表现在１０～１２ａ前，在７～１０ａ差异最大；整地对胸径的影响比对树高和单株材积的影响短１～２ａ。撩壕整地生长最好，但资金利用效果盈利率比块状整地低２．３７个百分点，单位投资额获得的收益比块状低１９．０３％。综合分析认为，理想的整地方式是块状整地，其规格为：３０ｃｍ×３０ｃｍ×３０ｃｍ或４０ｃｍ×４０ｃｍ×３０ｃｍ。
This paper deals with the effects of soil preparation to forest tree growth and economic benefit using the data of four kinds of soil preparation experiment(soil preparation of heigh norm(liao hao),strip,overall and spot)for Cunninghamia lanceolata and using the method of dynamic economic evaluation.A soil preparation experiment for C. lanceolata plantation was established on yellow red soil in Guizhou Province in 1978. The results of 17 years research showed that type of soil preparation affected survival rate,tree growth and economic benefit, the effect of soil preparation on stand growth lasted in a certain period of time. The effects to various current annual increment vanished in the 7th～10th year,the effects to stand mean height,mean DBH and single tree volume occured before 10～12 year,and the biggest difference occurred in the 7th～10th year.The effect of soil preparation to DBH was 1～2 year less than to tree height and single tree volume.The growth of heigh norm(liao hao)soil preparation was the best,but the results of fund utilization was not satisfactory and the profit ratio was 2.37% lower than that of spot soil preparation, the profit of each unit investment making was 19.03% lower than that of spot soil preparation,thus the economic results of heigh norm soil preparation was not satisfactory.By synthesis analysis the results of growth and economic benefit of various soil preparation,the best type manner of soil preparation was spot soil preparation,with the specification of 30 cm×30 cm×30 cm or 40 cm×40 cm×30 cm .
出处
《林业科学研究》
CSCD
北大核心
1997年第2期118-124,共7页
Forest Research
基金
国家"八五"攻关课题
关键词
杉木
整地
经济效益
生长
Chinese fir type of soil preparation economic benefit effect in a certain period of time
