白刺不同物候期的生物量分配规律
收稿日期: 2019-06-26
录用日期: 2020-05-01
网络出版日期: 2020-07-03
基金资助
国家自然科学基金(31470622);国家重点研发计划(31470622);中央级公益性科研院所基本科研业务费专项(31470622)
Variation in biomass allocation of Nitraria tangutorum during different phenological phases
Received date: 2019-06-26
Accepted date: 2020-05-01
Online published: 2020-07-03
Supported by
National Natural Science Foundation of China(31470622);National Key R&D Program of China(31470622);Fundamental Research Funds for the Central Nonprofit Research Institution of Chinese Academy of Forestry(31470622)
植物生物量的分配模式是植物对环境适应的结果, 并伴随着植物生活史的每一个阶段, 与植物的生长和发育息息相关。目前关于植物生物量分配的大小依赖性已有相关报道, 但关于其对物候期的响应尚鲜有报道。该研究以乌兰布和沙漠地区白刺(Nitraria tangutorum)为研究对象, 通过对其2016与2017年连续2个生长季里盛花期、盛果期与营养生长期3个物候期的根、压条、新枝、老枝、叶、繁殖器官等部分的生物量测定, 采用标准化主轴回归方程的斜率和截距的显著性比较, 分别探讨了白刺在不同物候期的异速生长的大小依赖程度和相对生物量分配比例, 特别是地上与地下部分之间、支持与同化器官之间, 在不同物候期的生物量分配规律。结果表明: 白刺的繁殖生长对生物量分配模式造成的影响主要体现在相对生物量分配比例(36.00%)而不是个体大小的依赖性程度上(16.67%), 且对新枝的影响较大, 使其不同物候期的大小依赖性程度发生了改变, 但是变化趋势不一致, 同时繁殖生长增加对叶片的相对生物量分配比例, 减少对老枝的相对生物量分配比例, 但并没有改变他们的大小依赖性程度。白刺生长过程中的地下部分生物量分配率随个体生物量的累积均增大, 而繁殖分配会在一定程度内减弱这种速率。白刺随着个体生物量的增大其生物量向支持器官分配率也越大, 但随着生长时间推移, 更倾向于将生物量分配给同化吸收器官。
邢磊, 段娜, 李清河, 刘成功, 李慧卿, 孙高洁 . 白刺不同物候期的生物量分配规律[J]. 植物生态学报, 2020 , 44(7) : 763 -771 . DOI: 10.17521/cjpe.2019.0162
Aims The pattern of plant biomass allocation represents the plant response to the environment and is accompanied by every stage of plant life history. So it is closely related to the growth and development of plants. There have been reports on the size dependence of plant biomass allocation, but few studies have reported on its responses to different phenological phase.
Methods In this study, Nitraria tangutorum in Ulan Buh Desert was used as the research object. The biomass of different organs (root, layering, newborn stem, older stem, leaf and reproductive organ) in the flowering, fruiting and vegetative growth stages in two consecutive years of 2016 and 2017 were measured. The significant differences of slope and intercept of the fitted equation with Standardized-major-axis were respectively used to discuss the varied size dependence and the biomass allocation in different phenological phase or ages, especially between the aboveground and belowground biomass and between the support and assimilation organs.
Important findings The results showed that the effect of reproductive allocation on biomass allocation pattern of N. tangutorum is mainly reflected in the scale of relative biomass allocation (36.00%) rather than the extent of size dependence (16.67%). The reproductive growth has a greater impact on the biomass allocation pattern of newborn stems, which changes the size dependence extent among different phenological phases, but the trend is inconsistent. The reproductive growth increases the scale of relative biomass allocation to leaves and reduces that to older stems, but did not change their extent of size dependence. The biomass allocation rate in the belowground part of N. tangutorum increased with the accumulation of its biomass, but the reproductive allocation slightly decreased this rate. Nitraria tangutorum exhibited a higher rate of biomass allocation to supporting organs as plant biomass increases. Over time it is more likely for biomass to be allocated to assimilating organs.
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