Plant sizes mediate mowing-induced changes in nutrient stoichiometry and allocation of a perennial grass in semi-arid grassland.
Plant sizes mediate mowing-induced changes in nutrient stoichiometry and allocation of a perennial grass in semi-arid grassland.
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植物大小介导半干旱草原中割草引起的养分化学计量变化和多年生草的分配
DOI：
10.1002/ece3.3866
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发表时间：
2018-03
影响因子：
2.6
通讯作者：
Li X
中科院分区：
文献类型：
--
作者：
Liu Z;Baoyin T;Sun J;Minggagud H;Li X
虽然半干旱草原割草引起的植物性状变化及其对生态系统功能的影响已得到充分研究，但植物大小与营养策略之间的关系在很大程度上尚不清楚。割草可能会推动植物养分限制和分配的变化。在此，我们在一项为期 17 年的对照实验中，评估了内蒙古草原优势植物羊草在不同割草频率下养分化学计量和分配随尺寸变化的变化。受割草影响，叶和茎中氮（N）、磷（P）和碳（C）的浓度显着增加，与植物大小呈负相关。此外，我们发现植物组织中 N、P 和 C 的浓度和积累之间存在显着的权衡。羊草地上生物量的氮磷比与植株大小呈线性相关，随着割草频率的增加而显着降低。羊草个体的C:N和C:P比值与植株大小呈指数正相关。随着割草频率的增加，羊草大小与N、P、C的叶茎分配比呈负抛物线、正、负线性趋势相关。结构方程模型结果表明，N、P、C分配受生物量分配和叶茎养分浓度比的共同调节。总之，我们发现植物性状和营养策略之间沿着割草频率存在显着的解耦效应。我们的结果揭示了一种机制，即长期割草引起的浓度、积累、生态化学计量和关键元素分配的变化是如何通过多年生根茎草植物大小的变化介导的。
While mowing‐induced changes in plant traits and their effects on ecosystem functioning in semi‐arid grassland are well studied, the relations between plant size and nutrient strategies are largely unknown. Mowing may drive the shifts of plant nutrient limitation and allocation. Here, we evaluated the changes in nutrient stoichiometry and allocation with variations in sizes of Leymus chinensis, the dominant plant species in Inner Mongolia grassland, to various mowing frequencies in a 17‐yr controlled experiment. Affected by mowing, the concentrations of nitrogen (N), phosphorus (P), and carbon (C) in leaves and stems were significantly increased, negatively correlating with plant sizes. Moreover, we found significant trade‐offs between the concentrations and accumulation of N, P, and C in plant tissues. The N:P ratios of L. chinensis aboveground biomass, linearly correlating with plant size, significantly decreased with increased mowing frequencies. The ratios of C:N and C:P of L. chinensis individuals were positively correlated with plant size, showing an exponential pattern. With increased mowing frequencies, L. chinensis size was correlated with the allocation ratios of leaves to stems of N, P, and C by the tendencies of negative parabola, positive, and negative linear. The results of structure equation modeling showed that the N, P, and C allocations were co‐regulated by biomass allocation and nutrient concentration ratios of leaves to stems. In summary, we found a significant decoupling effect between plant traits and nutrient strategies along mowing frequencies. Our results reveal a mechanism for how long‐term mowing‐induced changes in concentrations, accumulations, ecological stoichiometry, and allocations of key elements are mediated by the variations in plant sizes of perennial rhizome grass.
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影响因子：
1.8
作者：
Han, Wenwu;Luo, Yanjiang;Du, Guozhen
通讯作者：
Du, Guozhen
影响因子：
5.2
作者：
Carey CJ;Beman JM;Eviner VT;Malmstrom CM;Hart SC
通讯作者：
Hart SC
影响因子：
3.7
作者：
Li X;Wu Z;Liu Z;Hou X;Badgery W;Guo H;Zhao Q;Hu N;Duan J;Ren W
通讯作者：
Ren W
影响因子：
1.7
作者：
Bennett, LT;Judd, TS;Adams, MA
通讯作者：
Adams, MA
影响因子：
6.6
作者：
Grant, Kerstin;Kreyling, Juergen;Jentsch, Anke
通讯作者：
Jentsch, Anke