两种杨树能源林生物量及化学组分早期估算
首发时间:2015-05-20
摘要:本论文为三倍体毛白杨B301和欧美杨107能源林平茬后一年的生长研究,尝试将林分树皮和木质部(茎干除树皮的部分,以下简称木质部)的生物量以其林分茎干直径分布为依据划分至各径阶,通过测定茎干各径阶化学组分,估算矮林林分化学成分,为后续拓展最佳栽植密度等技术研究提供方法,为合理经营能源化利用杨树矮林奠定基础。主要研究结果如下:(1)两种杨树单枝生物量随着D22的增加而增加,呈良好的幂函数关系,欧美杨107和三倍体毛白杨B301的估算模型分别为 y = 0.0585x2.644(R2 = 0.9538),y = 0.0766x2.6102(R2 = 0.9636);(2)平茬后两种杨树各栽植密度下的林分生物量(6.54~12.40 t/hm2)成倍增加,已达到国际杨树短轮伐期矮林的平均年均生长量,而其林分树皮生物量较造林后一年均没有显著增加;(3)平茬后经过一年的生长,两种杨树各栽植密度下的林分化学成分没有显著差异,三倍体毛白杨B301各栽植密度下的纤维素含量、半纤维素含量和木质素含量的均值分别为42.93%、20.85%和27.69%,欧美杨107各栽植密度下三素含量的均值分别为40.03%、20.57%和27.86%,两种杨树之间林分化学成分亦无显著差异。
关键词: 杨树短轮伐期矮林 栽植密度 林分生物量 树皮比例 化学组分?????
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Early Study on Stand Biomass and Chemical Characteristics of Two Poplar Energy Plantations
Abstract:Chemical composition of biomass at stand level was estimated based on chemical traits of stem cross-sections and distribution of diameter classes within the whole plantations. Two poplar short-rotation coppice systems, triploid Populus tomentosa B301 ((P. tomentosa × P.bolleana) × P.tomentosa) plantation and Populus × euramericana cv. '74/76' plantation, were compared in terms of biomass yield and chemical composition. The main results were as followed: (1) A single general allometric equation linking shoot diameter to shoot biomass may be possiable to be used to estimate biomass production for the two years, 1 year after planting and 1 year after coppicing. Exception found for triploid Populus tomentosa B301 plantation was y = 0.0766x2.6102 (R2 = 0.9636). Exception found for Populus × euramericana cv. '74/76' was y = 0.0585x2.644 (R2 = 0.9538). (2) The stand biomass of Populus × euramericana cv. '74/76' and triploid Populus tomentosa B301 plantation in 1 year after coppicing was significantly higher than the one year after planting, about 6.54~12.40 t/(hm2oa), reaching the world-class level. More importantly, the 1 year stand bark biomass after coppicing under the three planting densities showed no significant difference with that after planting.(3) The chemical characteristics of three planting densities for Populus × euramericana cv. '74/76' and triploid Populus tomentosa B301 plantation after coppicing were almost the same. Cellulose, hemicellulose and lignin share of triploid Populus tomentosa B301 was 42.93%, 20.85% and 27.69% respectively. Similarly, cellulose, hemicellulose and lignin share of Populus × euramericana cv. '74/76' plantation was 40.03%, 20.57% and 27.86%. And there was also no significant difference between the two clones.
Keywords: poplar short rotation coppice planting density stand biomass bark content chemical characteristics
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