Nitrogen addition alters photosynthetic carbon fixation, allocation of photoassimilates, and carbon partitioning of Leymus chinensis in a temperate grassland of Inner Mongolia
Nitrogen addition alters photosynthetic carbon fixation, allocation of photoassimilates, and carbon partitioning of Leymus chinensis in a temperate grassland of Inner Mongolia
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氮添加改变内蒙古温带草原羊草的光合固碳、光同化物分配和碳分配
DOI：
10.1016/j.agrformet.2019.107743
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发表时间：
2019-12
影响因子：
6.2
通讯作者：
Yue Kexin
中科院分区：
文献类型：
--
作者：
Wang Biao;Gong Jirui;Zhang Zihe;Yang Bo;Liu Min;Zhu Chenchen;Shi Jiayu;Zhang Weiyuan;Yue Kexin
大气氮（N）沉降急剧增加，这可能对植物的碳（C）固定和分配产生重大影响。因此，了解氮添加对碳固定和同化碳分配模式的影响对于理解对陆地生态系统碳循环的影响至关重要。我们进行了一项田间实验，利用 13CO2 脉冲标记和测量分配给非结构碳水化合物 (NSC)、次生代谢物 (SM) 的同化百分比和温带半干旱草原的生长，研究氮添加（0 至 25g N m−2yr−1）对羊草光合碳固定和碳分配的影响。适量的 N 添加（5 和 10g N m−2yr−1）通过增加 Pn 和 L 生物量显着增加植物叶片的 δ13C 值和 13C 固定。中华。然而，高氮添加（25g N m−2yr−1）并没有导致 Pn 和总生物量的进一步增加，表明过量的氮输入对植物的光合作用固碳有害。适量的氮添加（10g N m−2yr−1）也显着增加了根冠比和分配给根的同化碳的比例，但降低了分配给叶和茎的比例，表明添加氮后有更多的碳分配给了根。我们进一步发现，适量的氮添加增加了总体 NSC 和 SM 浓度，但分配给生长的碳随着氮的增加而减少，这可能表明分配给防御的碳与分配给储存和生长的碳之间存在权衡。我们的研究结果表明，氮的添加将改变光合碳固定和光同化物的分配模式，从而在预测的未来全球变化下显着影响陆地生态系统的碳循环和碳平衡。
Atmospheric nitrogen (N) deposition is sharply increasing, and this may have substantial impact on carbon (C) fixation and allocation of plants. Knowledge of the effect of N addition on C fixation and allocation patterns of assimilated C is therefore critical to understand the effects on C cycles in terrestrial ecosystems. We conducted a field experiment to examine the effects of N addition (0 to 25 g N m−2yr−1) on photosynthetic C fixation and C allocation byLeymus chinensisusing13CO2pulse-labeling and measurements of the percentage of assimilation allocated to nonstructural carbohydrates (NSCs), secondary metabolites (SMs), and growth in a temperate semi-arid grassland. Moderate N addition (5 and 10 g N m−2yr−1) significantly increased the δ13C value and13C fixation of plant leaves by increasingPnand biomass ofL. chinensis. However, high N addition (25 g N m−2yr−1) did not result in a further increase inPnand total biomass, suggesting excess N inputs was harmful to photosynthetic C fixation in plants. Moderate N addition (10 g N m−2yr−1) also significantly increased the root/shoot ratio and the proportion of assimilated13C allocated to roots, but decreased the proportion of leaves and stems allocated, indicating more C was allocated to roots with N addition. We further found that moderate N addition increased the overall NSC and SM concentrations, but C allocation to growth decreased with increasing N, possibly indicating the existence of a trade-off between the C allocation to defense and the allocation to storage and growth. Our findings demonstrated that N addition will alter photosynthetic C fixation and the allocation patterns of photoassimilates, and thus will significantly affect the C cycle and C balance of terrestrial ecosystems under predicted future global changes.
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影响因子：
4.2
作者：
J. Reynolds;J. Thornley
通讯作者：
J. Reynolds;J. Thornley
脱叶时的碳分配：测试Balsam Fir的防御增长权衡。
影响因子：
5.6
作者：
Deslauriers A;Caron L;Rossi S
通讯作者：
Rossi S
影响因子：
6
作者：
Dastmalchi, Keyvan;Dorman, H. J. Damien;Hiltunen, Raimo
通讯作者：
Hiltunen, Raimo
影响因子：
7.4
作者：
B. Macler
通讯作者：
B. Macler
DOI：
10.1002/1097-0231(20000815)14:15
发表时间：
2000-08
期刊：
Rapid communications in mass spectrometry : RCM
影响因子：
--
作者：
T. Streeter;R. Bol;R. Bardgett
通讯作者：
T. Streeter;R. Bol;R. Bardgett