Whole-tree biomass and carbon allocation of juvenile trees of loblolly pine (Pinus taeda): influence of genetics and fertilization
Whole-tree biomass and carbon allocation of juvenile trees of loblolly pine (Pinus taeda): influence of genetics and fertilization
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DOI：
10.1139/x01-017
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发表时间：
2001-06
影响因子：
2.2
通讯作者：
W. Retzlaff;J. A. Handest;D. O'malley;S. McKeand;M. A. Topa
中科院分区：
文献类型：
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作者：
W. Retzlaff;J. A. Handest;D. O'malley;S. McKeand;M. A. Topa
为了评价火炬松（PinustaedaL.）两种人工林地下生物量分配对总碳（C）分配的贡献，我们检查了总生物量分配的快速和缓慢增长的家庭从每个种源。自从在北卡罗来纳州苏格兰县的一个干旱、贫瘠的地方种植以来，美国，在这项研究中，树木接受了两种营养处理之一：最佳营养或对照（不施肥）。24（1树/家庭情节DAD 2家庭DAD 2种源DAD 2治疗DAD 3块）5岁（少年）树木的总生物量于1998年1月收获。施肥增加了总根，总枝，总树生物量在所有的家庭相比，收获的树木在对照地块。施肥还增加了家系粗根、木质根、主根、茎、分支和叶的生物量。虽然有治疗和家庭的总根，总拍摄，总树，和各种个人的根和拍摄组件的现存作物生物量的差异，生物量（全树）分配到这些组织的百分比在治疗中保持相似。总非结构性碳水化合物（TNC）分析表明，一些治疗，家庭和种源的TNC浓度和分配淀粉和可溶性糖的差异。在收获时，地下组织的TNC浓度远高于地上组织，根组织中对淀粉的分配增强表明此时地下组织具有重要的C储存作用。事实上，超过90%的树木淀粉含量是在1月份的根组织。虽然受样本量的限制，每个家庭的三个收获的树木，这项研究表明，在全树水平上的生物量分配是相似的快速和缓慢生长的家庭不同种源的幼年火炬松，并没有受到施肥处理。
To assess the contribution of belowground biomass allocation towards total carbon (C) allocation of two prove- nances of loblolly pine (Pinus taeda L.), we examined the total biomass allocation of a fast- and slow-growing family from each provenance. Since planting on a xeric, infertile site in Scotland County, N.C., U.S.A., trees in this study have been sub - jected to one of two nutrient treatments: optimal nutrition or control (no fertilization). Total biomass of 24 (1 tree/family plot ◊ 2 families ◊ 2 provenances ◊ 2 treatments ◊ 3 blocks) 5-year-old (juvenile) trees was harvested in January 1998. Fer- tilization increased total root, total shoot, and total tree biomass in all families as compared with harvested trees in control plots. Fertilization also increased biomass of coarse-root, woody-root, taproot, stem, branch, and foliar components of fami - lies as compared with trees in control plots. Although there were treatment and family differences in standing-crop biomass of the total root, total shoot, total tree, and various individual root and shoot components, the percent biomass (whole-tree) allocation to these tissues remained similar across treatments. Total nonstructural carbohydrate (TNC) analysis indicated some treatment, family, and provenance differences in TNC concentrations and partitioning to starch and soluble sugars. At the time of harvest, TNC concentrations of belowground tissues were much higher than those of aboveground tissues, and en- hanced partitioning towards starch in root tissues indicates an important C storage role for belowground tissues at this time. Indeed, more than 90% of the trees starch content was present in root tissue in January. Although constrained by a sample size of three harvested trees per family, this study suggests that biomass allocation on a whole-tree level was similar between fast- and slow-growing families of different provenances of juvenile loblolly pine and was not affected by fertilizer treatment.