Heavy grazing effects on stem elongation and internode allometry: Insights from a natural pasture grass
Heavy grazing effects on stem elongation and internode allometry: Insights from a natural pasture grass
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重度放牧对茎伸长和节间异速生长的影响：来自天然牧草的见解
DOI：
10.1111/gfs.12416
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发表时间：
2019-09
影响因子：
2.4
通讯作者：
Xiliang Li
中科院分区：
文献类型：
--
作者：
Zhiying Liu;Zhen Zhang;Tianyu Zhang;Ruofan Gao;Xiliang Li
有限的植物茎伸长被假设为响应于长期重度放牧（LHG）而降低植物生长的主要原因。然而，它仍然在很大程度上是未知的LHG诱导的茎伸长的变化是如何介导的节间性状。因此，本研究以锡林浩特市羊草为试材，研究了当地政府推荐放牧率2倍的放牧对羊草茎伸长和节间异速生长的影响。根据植物体从基部到顶端的位置，测量了植物个体的大小和节间性状，包括节间长度（IL）、节间直径（ID）和节间数（IN）。结果表明，低次谐波对IN及其分布有明显的影响。LHG对羊草各节间的节间长度和节间长度以及茎长的影响呈负相关，但节间长度和节间长度的可塑性指数随LHG的增加先增加后减小。这些节间性状的差异反应是由LHG和节间位置决定的节间性状间异速生长的结果。最终确定，在LHG条件下，IL和IN是影响茎长减少的关键性状，分别解释52.51%和47.49%的茎长变异。总之，我们的研究结果表明，LHG诱导的羊草茎伸长的限制是由节间性状的可塑性和异速生长介导的。这一结果强调了植物个体对LHG的敏感性，对草地的优化管理具有潜在的价值。
Limited plant stem elongation is hypothesized to be the primary cause of decreased plant growth in response to long‐term heavy grazing (LHG). However, it remains largely unknown how LHG‐induced changes in stem elongation are mediated by internode traits. Accordingly, we experimentally investigated the effects of LHG (defined as twice the stocking rate recommended by the local government) on plant stem elongation and internode allometry inLeymus chinensisin Xilinhot, Inner Mongolia, China. Plant size and internode traits, including internode length (IL), internode diameter (ID), and internode number (IN), from plant individuals were measured according to their phytomer position from base to apex. The results revealed that IN and their distributions were changed in response to LHG. Although LHG negatively affected IL and ID of eachL. chinensisinternode from base to apex and eventually stem length, the plasticity index of IL and ID increased initially and then decreased from the lowermost to the uppermost internode in response to LHG. These contrasting responses of internode traits were result of allometry between internode traits determined by both LHG and internode position. Ultimately, IL and IN were identified to be key traits influencing stem length reduction under LHG conditions and explaining 52.51% and 47.49% of variation in stem length, respectively. Overall, our findings suggest that the limitation ofL. chinensisstem elongation induced by LHG is mediated by the plasticity and allometry of internode traits. This result emphasizes the sensitivity of individual plants to LHG and is potentially valuable for optimal grassland management.
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影响因子：
1.8
作者：
Thomas D. Gautheir
通讯作者：
Thomas D. Gautheir
放牧改变了高山非草类植物秦艽叶片光合作用和呼吸作用的变暖效应
影响因子：
2.7
作者：
Shen HH;Wang SP;Tang YH
通讯作者：
Tang YH
影响因子：
4.9
作者：
Shuxia Zheng;Zhichun Lan;Wenhuai Li;Rui Shao;Yumei Shan;H. Wan;F. Taube;Yongfei Bai
通讯作者：
Shuxia Zheng;Zhichun Lan;Wenhuai Li;Rui Shao;Yumei Shan;H. Wan;F. Taube;Yongfei Bai
影响因子：
3
作者：
S. Damhoureyeh;D. Hartnett
通讯作者：
S. Damhoureyeh;D. Hartnett
DOI：
--
发表时间：
2006
期刊：
--
影响因子：
--
作者：
D. Falster;D. Warton;I. Wright
通讯作者：
D. Falster;D. Warton;I. Wright