摘要
以长白山地区红松过伐林为研究对象,对采用3种不同间伐处理(强度间伐、弱度间伐和对照)5 a后中幼龄过伐林地表凋落物进行采样和分析。结果表明:中、幼龄林凋落物总储量均随间伐强度的增加呈减少的趋势,强度间伐和弱度间伐与对照相比分别降低了15.69%、12.55%和15.00%、10.21%;凋落物分解转化率随间伐强度的增加呈增加的趋势;凋落物层N、P储量随间伐强度的增加呈减少的趋势,K储量以弱度间伐最高;强度间伐和弱度间伐后中、幼龄林凋落物层碳密度与对照相比分别降低了16.33%、11.24%和16.16%、16.12%。总体上看间伐加速了凋落物的分解,加快了碳和养分的循环速度,同时也降低了凋落物中养分和碳的储量。
We sampled and analyzed the litters under overcut natural torests with dtterent ages treated wtn mree omerent thinning intensities （Heavy （HIT）, Light （LIT） and control） with two stands （middle and juvenile stands）. We detected the decline of standing biomass （LSB） with increased thinning intensities in forests of both ages with 15.69% and 12.55% decrease in middle-aged stands and 15.00% and 10.21% decrease in juvenile stands, respectively, compared with HIT, LIT and control treatments （p〈0.05）. Decomposion rate increases with the increase of thinning intensities （p〉0.05）. N and P storages tend to decrease with the increase of thinning intensities. Great K storage is found with LIT treatment. Car bon density declines with the increase of thinning intensities. Compared with control, litter carbon density under HIT and LIT treatments decreases by 16.33% , 11.24% and 16.16%, 16.12% , respectively, in middle-aged and juvenile stands （p〈0.05）. Therefore, thinning can accelerate the litter decomposition rate, nutrient and carbon cycling, but reduce nutri- ent and carbon storage.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2013年第10期10-13,共4页
Journal of Northeast Forestry University
基金
国家"十二五"科技支撑项目(2011BAD37B02)
关键词
过伐林
间伐强度
凋落物
分解转化率
养分储量
碳密度
Overcut natural forest
Thinning intensity
Litter
Decomposion rate
Nutrient storage
Carbon density
