The Intensity of Simulated Grazing Modifies Costs and Benefits of Physiological Integration in a Rhizomatous Clonal Plant
The Intensity of Simulated Grazing Modifies Costs and Benefits of Physiological Integration in a Rhizomatous Clonal Plant
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模拟放牧的强度改变了根茎克隆植物生理整合的成本和效益
DOI：
10.3390/ijerph17082724
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发表时间：
2020-04
影响因子：
--
通讯作者：
Ying Gao
中科院分区：
文献类型：
--
作者：
Jushan Liu;Chen Chen;Yao Pan;Yang Zhang;Ying Gao
草原克隆植物是具有生理整合能力的特殊物种，在异质环境中具有较强的抗逆性。然而，很少有人知道放牧强度如何影响的利益和成本之间的权衡生理整合，以及生理整合的机制，提高补偿性生长草食动物压力。通过温室试验，研究了模拟放牧强度对克隆植物羊草（Leymuschinensis）补偿生长和生理整合的影响。本试验采用因子设计，包括养分异质性（高-高、高-低、低-高、低-低）、剪草（0%、25%、50%和75%）和根茎连接（完整与切断）处理。除低-低养分处理外，25%和50%刈割处理的补偿指数均高于75%刈割处理。当目标分株分别作为输出者和输入者时，生理整合降低了补偿指数，而增加了补偿指数。一般而言，修剪增加了生理整合的收益和成本，但其净收益（收益减去成本）随修剪强度而变化。在轻、中度刈割强度下，生理整合优化了补偿生长，其净效益决定了较高的补偿生长能力。草地管理措施如轻、中度放牧或刈割可最大限度地提高草地的生理整合效益，提高草地的可持续性。
Clonal plants in grasslands are special species with physiological integration which can enhance their ability to tolerate herbivory stress especially in heterogeneous environments. However, little is known about how grazing intensity affects the trade-off between the benefits and costs of physiological integration, and the mechanism by which physiological integration improves compensatory growth in response to herbivory stress. We examined the effects of simulated grazing intensity on compensatory growth and physiological integration in a clonal species Leymus chinensis with a greenhouse experiment. This experiment was conducted in a factorial design involving nutrient heterogeneity (high-high, high-low, low-high, low-low), simulated grazing by clipping (0%, 25%, 50% or 75% shoot removal) and rhizome connection (intact versus severed) treatments. Compensatory indexes at 25% and 50% clipping levels were higher than that at 75% clipping level except in low-low nutrient treatments. Physiological integration decreased and increased compensatory indexes when the target-ramets worked as exporter and importer, respectively. Generally, clipping increased both benefits and costs of physiological integration, but its net benefits (benefits minus costs) changed with clipping intensity. Physiological integration optimized compensatory growth at light and moderate clipping intensity, and its net benefits determined the high capacity of compensatory growth. Grassland managements such as grazing or mowing at light and moderate intensity would maximize the profit of physiological integration and improve grassland sustainability.
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影响因子：
2.3
作者：
Wang Deli;Du Juan;Zhang Baotian;Ba Lei;Hodgkinson Kenneth C.
通讯作者：
Hodgkinson Kenneth C.
影响因子：
2.7
作者：
A. Slade;M. Hutchings
通讯作者：
A. Slade;M. Hutchings
影响因子：
4.8
作者：
ALPERT, P
通讯作者：
ALPERT, P
DOI：
10.1016/j.scitotenv.2018.03.264
发表时间：
2018-03
期刊：
The Science of the total environment
影响因子：
--
作者：
Jonatan Rodríguez;Mariasole Calbi;S. Roiloa;L. González
通讯作者：
Jonatan Rodríguez;Mariasole Calbi;S. Roiloa;L. González
影响因子：
9.4
作者：
J. Bullock;A. Mortimer;M. Begon
通讯作者：
J. Bullock;A. Mortimer;M. Begon