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The responses of three dominant species to increased rainfall under different grazing systems in a desert steppe
Hydrological Processes ( IF 2.8 ) Pub Date : 2022-06-07 , DOI: 10.1002/hyp.14632 Yifan Song 1, 2 , Tiejun Liu 1 , Jing Wang 3 , Yajing Lu 4 , Jianying Guo 1 , Zhi Dong 3 , Yunhao Wen 5 , Zhiyong Pei 6
Hydrological Processes ( IF 2.8 ) Pub Date : 2022-06-07 , DOI: 10.1002/hyp.14632 Yifan Song 1, 2 , Tiejun Liu 1 , Jing Wang 3 , Yajing Lu 4 , Jianying Guo 1 , Zhi Dong 3 , Yunhao Wen 5 , Zhiyong Pei 6
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Compared with drought stress, our knowledge about the potential precipitation increase in desert steppes and its ecological effects is still limited. In order to improve our understanding of the responses of desert steppe plants to climate change and human activities, we performed a 3-year-long controlled water addition experiment in grasslands with different grazing systems. The results showed that increased water changed the plant height/above-ground biomass/leaf-tissue thickness of Stipa breviflora Griseb., Cleistogenes squarrosa (Trin.) Keng and Convolvulus ammannii Desr. by +23.86%/+77.35%/−19.09%, +14.67%/+162.34%/−16.62% and + 29.14%/+69.37%/−22.85%, respectively, compared to those in the control group. The net photosynthetic rate, stomatal conductance, transpiration rate and water-use efficiencies of these three types of plants increased by 0.32%–43.71% with water addition, compared to the corresponding parameters in the control group. We also found that plant responses to increased rainfall were not always positive. Under the unique environmental conditions of desert steppes, increase in rainfall has a limited restorative effect on vegetation and an excessive increase in rainfall may actually inhibit plant growth and exacerbate grazing grassland degradation. Compared to rotational grazing and continuous grazing grasslands, plants in enclosed grasslands had higher restoration thresholds and better restorative effect following increased rainfall. Enclosure increased the adaptability and resilience of grazing grassland plants towards increased rainfall. Under the background of increased rainfall, while we look forward to the ecological restoration in desert steppe, we also need to be alert to the potential adverse effects of excessive rainfall on grazing grasslands.
中文翻译：
沙漠草原不同放牧系统下三种优势物种对降雨增加的响应
与干旱胁迫相比，我们对荒漠草原潜在降水增加及其生态影响的认识仍然有限。为了加深我们对荒漠草原植物对气候变化和人类活动响应的了解，我们在不同放牧系统的草原上进行了为期 3 年的控制加水实验。结果表明，增加的水改变了短花针茅、Cleistogenes squarrosa (Trin.) Keng 和 Convolvulus ammannii Desr. 的株高/地上生物量/叶组织厚度。与对照组相比，分别增加了 +23.86%/+77.35%/-19.09%、+14.67%/+162.34%/-16.62% 和 +29.14%/+69.37%/-22.85%。净光合速率、气孔导度、与对照组的相应参数相比，这三种植物的蒸腾速率和水分利用效率随着水分的增加而增加了0.32%~43.71%。我们还发现植物对降雨增加的反应并不总是积极的。在荒漠草原独特的环境条件下，降雨增加对植被的恢复作用有限，降雨过度增加实际上可能抑制植物生长，加剧放牧草地退化。与轮牧和连续放牧草地相比，封闭草地的植物在降雨增加后具有更高的恢复阈值和更好的恢复效果。围栏增加了放牧草地植物对增加降雨的适应性和恢复力。在降雨增加的背景下，
更新日期：2022-06-07
中文翻译：
沙漠草原不同放牧系统下三种优势物种对降雨增加的响应
与干旱胁迫相比，我们对荒漠草原潜在降水增加及其生态影响的认识仍然有限。为了加深我们对荒漠草原植物对气候变化和人类活动响应的了解，我们在不同放牧系统的草原上进行了为期 3 年的控制加水实验。结果表明，增加的水改变了短花针茅、Cleistogenes squarrosa (Trin.) Keng 和 Convolvulus ammannii Desr. 的株高/地上生物量/叶组织厚度。与对照组相比，分别增加了 +23.86%/+77.35%/-19.09%、+14.67%/+162.34%/-16.62% 和 +29.14%/+69.37%/-22.85%。净光合速率、气孔导度、与对照组的相应参数相比，这三种植物的蒸腾速率和水分利用效率随着水分的增加而增加了0.32%~43.71%。我们还发现植物对降雨增加的反应并不总是积极的。在荒漠草原独特的环境条件下，降雨增加对植被的恢复作用有限，降雨过度增加实际上可能抑制植物生长，加剧放牧草地退化。与轮牧和连续放牧草地相比，封闭草地的植物在降雨增加后具有更高的恢复阈值和更好的恢复效果。围栏增加了放牧草地植物对增加降雨的适应性和恢复力。在降雨增加的背景下，
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