CAJ | 학술논문

对3个不同年龄的光皮桦生物量分布规律的研究结果表明：在2～4年内,光皮桦单株生物量随年龄的增大而迅速增大,表现出良好的速生性,4年生时单株生物量是3年生的238.0%,是2年生生物量的363.4%。从单株生物量的组成来看,干所占比例随年龄增大而增大,从2年生时的45.8%,增加到3年生时的56.4%和4年生的58.2%,枝、叶所占比例则随年龄增加而下降,其中枝的比例从2年生时的26.7%下降到3年生时的20.5%和4年生时的21.6%,叶的比例从2年生时的3.6%下降到3年生时的2.3%和4年生时的2.2%。而不同年龄根系的生物量均表现为主根〉侧根〉细根。随着林龄的增加,光皮桦单株根冠比在下降,即从2年生时的0.31下降到4年生时的0.22。
대3개불동년령적광피화생물량분포규률적연구결과표명：재2～4년내,광피화단주생물량수년령적증대이신속증대,표현출량호적속생성,4년생시단주생물량시3년생적238.0%,시2년생생물량적363.4%。종단주생물량적조성래간,간소점비례수년령증대이증대,종2년생시적45.8%,증가도3년생시적56.4%화4년생적58.2%,지、협소점비례칙수년령증가이하강,기중지적비례종2년생시적26.7%하강도3년생시적20.5%화4년생시적21.6%,협적비례종2년생시적3.6%하강도3년생시적2.3%화4년생시적2.2%。이불동년령근계적생물량균표현위주근〉측근〉세근。수착림령적증가,광피화단주근관비재하강,즉종2년생시적0.31하강도4년생시적0.22。
The biomass distribution of Betula luminifera was studied at different ages,the results showed that： the biomass of Betula luminifera was increased with age,single plant biomass at 4a is 238.0% compared to 3a＇,is 363.4% to 2a＇.The composition of single plant biomass was different at different ages,The trunk proportion increased with age,which increased from 45.8% at 2a to 56.4% at 3a and 58.2% at 4a,The proportion of branch and leaf decreased by ages,the proportion of branche was 26.7% at 2a decreasd 20.5% at 3a and 21.6% at 4a,the proportion of leaves decreased from 3.6%at 2a to 2.3%,2.2% at 3a,4a respectively.The biomass distribution of root was taproot root lateral fine roots at different ages.The ratio of root to shoot decreased from0.31 at 2a to 0.22 at 4a.