摘要
在太行五台山地区,调查华北落叶松人工林林分16块标准地,并测定了单株平均木各器官生物量及营养元素含量,拟合了华北落叶松林木各器官生物量随年龄变化的logistics生长方程。试验表明:华北落叶松立木及林分生物量年平均生长随年龄呈抛物线变化,24年生时达到高峰,而叶片对干材的净光合同化率18年生时即达顶峰,约为400g/m2。15年生林木各器官主要营养元素总积累量,从大到小顺序为N、Ca、K、Mg、P,林分每公顷可积累以上五种营养元素的总量是888.91kg。N为406.86kg,其中叶片中N积累214.56kg,占总N积累的52.74%;干中N积累54.35kg,占总N积累的13.36%。15年生华北落叶松林分,生产1吨干物质即固定N3.5kg;而生产1m2木材需固定N4.6kg;伐倒1m3木材所消耗的N仅为0.611kg,占1m3木材需固N总量的13.36%。
sample plots of Larix principis-rupprechtii plantation were investigated inWutaishan
Mountain region. Biomass of organs and content of nutrient elements of averagetrees were
measured in the sample plots. Regression models of tree biomass and DBH
wereselected.Annual biomass increment response was simulated according to the logistics
equa-tion. The results were as follows. BiOmass of tree and annual forest increment response
isshowed by a parabola,its peak is at the age of 24;the peak of the amount of net
photosyn-thesis rate of needle(400g/m2)is at the age of 18.When this larch plantation is of
15-year-old,the order of accumulation of nutrient elements is as follows:the amount of the
nutrientelement accumulated(including N、Ca、K、Mg、P)are 888.91 kg/hm2 ,among which N
406. 86 ks/hm2(including 54.35 kg/hm2 in stems and 214.56 kg/hm2 in
needles).Besides,thereare N 3.5 kg in 1 ton of dry matter and N 4.6 kg in 1 m3 of wood,but only
0.611 kg of Nwas in 1 m3stem(accounting for 13.36%of the total),the rest of the N was in the
branch-es,leaves,barks and roots.
出处
《林业科学研究》
CSCD
北大核心
1995年第1期88-93,共6页
Forest Research
基金
"八五"国家科技攻关专题
关键词
华北落叶松
生物量
养分积累
人工林
Larix principis-rupprechtii,biomass,stem
growth,accumulation of nutrient