Carbon dynamics in aboveground biomass of co-dominant plant species in a temperate grassland ecosystem: same or different?
Carbon dynamics in aboveground biomass of co-dominant plant species in a temperate grassland ecosystem: same or different?
复制标题
温带草原生态系统中共同优势植物物种地上生物量的碳动态：相同还是不同？
DOI：
10.1111/nph.13800
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
H. Schnyder
中科院分区：
文献类型：
--
作者：
U. Ostler;Inga Schleip;Fernando Alfredo Lattanzi;H. Schnyder
了解单个生物在整个生态系统碳(C)通量中的作用可能是当前碳循环研究中最大的挑战。因此，不同的植物群落成员在地上生物量的代谢性(τMetab)和非代谢性(即结构性)(τnon metab)C池以及分配给地上非代谢生物量的固定C部分(Anonmetab)中的停留时间是相同还是不同是未知的。我们评价了温带草原群落中不同功能群(两个丛生杂草、一个丛生豆科和一个莲座状双子叶)共优势种的τMetab、τNon Metab和Anonmetab。连续的14-16-d长(13)C-标记实验分别于2006年9月、2007年5月和2007年9月进行。具有良好混合代谢和非混合非代谢池的两池分室系统是最简单的生物学意义模型，它符合所有物种全枝生物量的~(13)C示踪动力学。在所有实验期间，该物种具有相似的τ代谢抗体(5-8天)，而τ非代谢抗体的范围为20-58天(除一个异常值外)，无代谢抗体的范围为7-45%。τ非代谢抗体和无性代谢抗体的变异与物种或试验时期没有系统关联，但与叶片寿命有关，特别是在禾本科植物中。物种间相似的池塘动力学表明群落水平上的相似动力学。
Understanding the role of individual organisms in whole-ecosystem carbon (C) fluxes is probably the biggest current challenge in C cycle research. Thus, it is unknown whether different plant community members share the same or different residence times in metabolic (τmetab ) and nonmetabolic (i.e. structural) (τnonmetab ) C pools of aboveground biomass and the fraction of fixed C allocated to aboveground nonmetabolic biomass (Anonmetab ). We assessed τmetab , τnonmetab and Anonmetab of co-dominant species from different functional groups (two bunchgrasses, a stoloniferous legume and a rosette dicot) in a temperate grassland community. Continuous, 14-16-d-long (13) C-labeling experiments were performed in September 2006, May 2007 and September 2007. A two-pool compartmental system, with a well-mixed metabolic and a nonmixed nonmetabolic pool, was the simplest biologically meaningful model that fitted the (13) C tracer kinetics in the whole-shoot biomass of all species. In all experimental periods, the species had similar τmetab (5-8 d), whereas τnonmetab ranged from 20 to 58 d (except for one outlier) and Anonmetab from 7 to 45%. Variations in τnonmetab and Anonmetab were not systematically associated with species or experimental periods, but exhibited relationships with leaf life span, particularly in the grasses. Similar pool kinetics of species suggested similar kinetics at the community level.
13C 标记显示了层次结构对密集田地中个体和功能组碳增益的影响
影响因子：
4.8
作者：
Lattanzi F.A;Berone G.D;Feneis W. ;Schnyder H.
通讯作者：
Schnyder H.