Interannual variation in ecosystem respiration in an Inner Mongolian meadow steppe in response to livestock grazing
Interannual variation in ecosystem respiration in an Inner Mongolian meadow steppe in response to livestock grazing
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内蒙古草甸草原生态系统呼吸对牲畜放牧的响应的年际变化
DOI：
10.1016/j.ecolind.2021.108121
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发表时间：
2021-11
影响因子：
6.9
通讯作者：
Li Linghao
中科院分区：
文献类型：
--
作者：
Yan Ruirui;Zhang Yu;Wang Miao;Li Ruiqiang;Jin Dongyan;Xin Xiaoping;Li Linghao
了解放牧对草地生态系统呼吸的影响，对于准确评估放牧管理对气候变化的反馈至关重要。研究了2009 - 2018年内蒙古东部草甸草原生态系统生长季不同放牧强度对生态系统呼吸的影响。我们发现，未放牧草地有最高的平均年Re率，与季节CV在Re范围从37.53%到46.04%的所有治疗。当所有的处理作为一个整体进行分析，我们确定了一个显着的正相关关系，年Re率和年峰值的立植物地上生物量。研究结果表明，放牧强度不同，影响年平均雷诺数的控制因子也不同。在未放牧和轻度放牧样地（G0.00和G0.23），年平均Re速率主要受冠层高度和/或降雨量的控制，而在中度和重度放牧样地，年平均Re速率更主要受NH 4 +-N和速效磷含量的控制。我们检测到显着的正相关关系，在整个研究期间的降雨量，土壤水分，铵态氮，土壤有效磷的年Re率，而显着的负相关关系之间的年生态系统呼吸速率和平均生长季节温度，无论放牧强度。我们的研究结果表明，放牧可以大大简化之间的关系，平均年Re率和生物和非生物参数。可见，年Re速率与地上现存量之间的关系是梯度放牧影响中国草甸草原生态系统Re的主要机制。
Understanding the effects of livestock grazing on ecosystem respiration (Re) of grassland ecosystems is critical for accurately assessing the feedback of grazing management to climate change. We examined ecosystem respiration in response to varying cattle grazing intensities during growing seasons from 2009 to 2018 in a meadow steppe ecosystem of eastern Inner Mongolia. We found that ungrazed swards had the highest mean annual Re rate, with seasonal CVs in Re ranging from 37.53% to 46.04% for all treatments. When all treatments were analysed as a whole, we identified a significant positive relationship between the annual Re rate and annual peak value of standing plant aboveground biomass. Our findings showed that controlling factors on the mean annual Re differed substantially with grazing intensity. In ungrazed and lightly-grazed plots (G0.00 and G0.23), the mean annual Re rate was controlled mainly by canopy height and/or rainfall, while it was controlled more predominantly by contents of NH4+-N and available phosphorus in moderately and heavily grazed plots. We detected significant positive relationships of the annual Re rate with rainfall, soil moisture, ammonium nitrogen, and soil available phosphorus during the entire study period, whereas significant negative relationships were detected between the annual ecosystem respiration rate and the mean growing season temperature, irrespective of grazing intensity. Our findings revealed that grazing could substantially simplify the relationship between the mean annual Re rate and biotic and abiotic parameters. It may be concluded that the relationship between the annual Re rate and the standing crop aboveground biomass was a principal mechanism underlying the effects of gradient grazing on the Re of Chinese meadow steppe ecosystems.
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影响因子：
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作者：
Yuchun Yan;Ruirui Yan;Jiquan Chen;Xiaoping Xin;David J. Eldridge;Changliang Shaoa;Xu Wang;Shijie Lv;Dongyan Jin;Jinqiang Chen;Zhenjie Guo;Baorui Chena;Lijun Xu
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发表时间：
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影响因子：
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影响因子：
6.2
作者：
Jingxue Zhao;T. Luo;Ruicheng Li;Xiang Li;L. Tian
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