Effects of grazing on photosynthetic features and soil respiration of rangelands in the Tianshan Mountains of Northwest China.
Effects of grazing on photosynthetic features and soil respiration of rangelands in the Tianshan Mountains of Northwest China.
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DOI：
10.1038/srep30087
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发表时间：
2016-07-25
影响因子：
4.6
通讯作者：
Chen HY
中科院分区：
文献类型：
--
作者：
Liu H;Zang R;Chen HY
牧场在全球碳循环中发挥着关键作用。然而，放牧对叶片光合作用和土壤呼吸影响的生态生理机制尚不清楚。为了研究放牧对叶片光合作用和土壤呼吸的影响，我们测定了中国天山放牧和非放牧草地优势种白三叶的光合作用参数和土壤呼吸。结果表明，放牧使草地日最大净光合速率和土壤呼吸速率分别降低了35%和15%。放牧条件下，羊草叶片的光合作用量子效率、暗呼吸速率和水分利用效率分别降低了33.3%、69.2%和21.5%。我们的结果表明，放牧降低了天山牧场的碳同化，而增加了土壤呼吸。
Rangelands play a critical role in the global carbon cycle. However, the eco-physiological mechanisms associated with the effects of grazing on leaf photosynthesis and soil respiration remain poorly understood. To examine the impacts of grazing on leaf photosynthesis and soil respiration, we measured the photosynthetic parameters of the dominant species (Trifolium repens) and the soil respiration in grazed and ungrazed rangelands in the Tianshan Mountains of China. We found that grazing reduced the daily maximum net photosynthetic rate and soil respiration rates by 35% and 15%, respectively. The photosynthetic quantum yield, dark respiratory rate, and water use efficiency of T. repens leaves were reduced in grazed plots by 33.3%, 69.2%, and 21.5%, respectively. Our results demonstrated that grazing reduced carbon assimilation while increasing soil respiration within the rangelands in the Tianshan Mountains.