項(xiàng)文化　 田大倫　 閆文德　

摘　要：對桿材階段不同密度的馬尾松林在低強(qiáng)度間伐后生物量的動態(tài)變化進(jìn)行了分析對比，結(jié)果表明：間伐后平均木的單株生物量和各器官生物量隨密度增加而減少；隨林分年齡的增加，單株生物量與樹干、皮、根的生物量因積累而增大，但枝、葉的生物量先增加后減少，在林分年齡為20a時達(dá)到最大值，隨后又接近間伐前的數(shù)值；林分生物量隨年齡增加而增加，其中密度為3000株^.hm^-2的林分生物量始終最大，密度為3750、2655株^.hm^-2的林分次之，密度為4515株^.hm^-2林分最??；間伐后不同密度馬尾松林生物量生長量變化情況不同，密度為2655株^.hm^-2的林分沒有出現(xiàn)最大值，密度為3000和3750株^.hm^-2的林分在林齡為20a時出現(xiàn)最大值，密度為4515株^.hm^-2的林分在林齡為17a時出現(xiàn)最大值，說明林分密度過大會影響林分生長，應(yīng)采取間伐措施調(diào)節(jié)林分密度，密度為3000和3750株^.hm^-2的林分第二次間伐時間可選在林分年齡為20a，而密度為4515株*hm-2的林分應(yīng)選在林齡為17a時第二次間伐.
關(guān)鍵詞：馬尾松；生物量；密度；間伐；動態(tài)規(guī)律
分類號：S791.248.06　文獻(xiàn)標(biāo)識碼：A
文章編號：1000-2502(2001)01-0010-04

Impact of Intermediate Thinning on the Biomass Dynamic in Masson Pine Stands with Variant Densities

XIANG Wen-hua（Faculty of Resources and Environment of CSFU,Zhuzhou 412006,Hunan,China）　
TIAN Da-lun（Faculty of Resources and Environment of CSFU,Zhuzhou 412006,Hunan,China）　
YAN Wen-de（Faculty of Resources and Environment of CSFU,Zhuzhou 412006,Hunan,China）　

Abstract：The biomass dynamic of Masson pine stands at pole stage with variant densities after thinning was analyesed. The results indicate that the tree biomass decreas es in pace with stand density increase and accumalates with stand age. After th inning, the biomass of leaves and branches decrease at first and then increase with stand growth. The dynamic of stand biomass after thinning demonstrates tha t the s tand with density of 3 000 trees^.hm^-2 remains to hold the highest biomass because it is the density suitable for masson pines. For the excessive high de nsity stands, thi nning should be carried out. Thinning time in stands with density of 3 000 trees?hm-2 and 3 750 trees?hm-2 is 20 years, and for stands with density of 4 515 trees?hm-2,it is 17 years.
Keywords：Masson pine； biomass； density； thinning； dynamic law

出版日期：2001年3月1日