期刊
PEERJ
卷 8, 期 -, 页码 -出版社
PEERJ INC
DOI: 10.7717/peerj.9915
关键词
Livestock; Nutrient cycling; Leaf N concentration; Leaf P concentration; Nutrient resorption efficiency
资金
- National Natural Science Foundation of China [31770542, 41601269, 31761123001-1]
- Major Project of National Natural Science Foundation of Inner Mongolia [2020ZD06]
- Ningxia Hui Autonomous Region key research and development plan project [2017BY085]
- National Natural Science Foundation of Inner Mongolia [2019MS03001, 2019MS03003]
- Central Nonprofit Research Institutes Fundamental Research Funds [1610332020005]
- Inner Mongolia Science and Technology Plan [2019GG009]
- Grass and Livestock Resource-Saving Production System and Sustainable Development Mode of Ecologically Vulnerable Areas [[2018]1351]
- National Natural Science Foundation of USA [31761123001-1]
Nutrient resorption from senesced leaves is an important mechanism for nutrient conservation in plants. However, little is known about the effect of grazing on plant nutrient resorption from senesced leaves, especially in semiarid ecosystems. Here, we evaluated the effects of grazing on N and P resorption in the three most dominant grass species in a typical steppe in northern China. We identified the key pathways of grazing-induced effects on N and P resorption efficiency. Grazing increased N and P concentrations in the green leaves of Leymus chinensis and Stipa grandis but not in Cleistogenes squarossa. Both L. chinensis and S. grandis exhibited an increasing trend of leaf N resorption, whereas C. squarrosa recorded a decline in both leaf N and P resorption efficiency under grazing. Structural equation models showed that grazing is the primary driver of the changes in N resorption efficiency of the three dominant grass species. For L. chinensis, the P concentration in green and senesced leaves increased the P resorption efficiency, whereas the senesced leaf P concentration played an important role in the P resorption efficiency of C. squarrosa. Grazing directly drove the change in P resorption efficiency of S. grandis. Our results suggest that large variations in nutrient resorption patterns among plant species depend on leaf nutritional status and nutrient-use strategies under overgrazing, and indicate that overgrazing may have indirect effects on plant-mediated nutrient cycling via inducing shifts in the dominance of the three plant species.
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