杉木连栽土壤对其幼树生长的影响

在会同林区采用３种不同连栽杉木次数的土壤，进行杉木幼树盆栽试验．结果表明，杉木连栽不利其幼树生长．连裁使幼树高生长下降３７—４０％，基径下降１９—２８％，冠幅下降２１—２９％，总生物量减少４５—５０％．杉木连栽还造成土壤养分递减，即腐殖质减少７—２８％，速效养分下降２３—２８％，土壤微生物数量和活性也大大降低．因此，杉木纯林连栽经营方式应尽快改变．

Influence of repeatedly planting soil on Cunninghamia lonceolata sapling growth

Pot experiment results of Cunninghamia lanceolata saplings on three types of repeatedly planting soils of Huitong forest area show that repeatedly planting soil is not suitable for sapling growth, the height growth is decreased by 37- 40%, base diameter by 19-28 %, canopy size by 21-29, and total biomass by 45-50%. Repeatedly planting of Cunninghamia lanceolata also induces the decrease of soil fertility: humus content by 17-28%, available nutrients by 23-28%, and the number of soil microbes and their activity are declined significantly. It is suggested that the management system of repeatedly planting pure Cunninghamia lanceolata stand should be abandoned.