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首页> 外文期刊>Journal of Agronomy and Crop Science/Zeitschrift fur acker-und pflanzenbau >Water stress and warming impact nutrient use efficiency of Mombasa grass (Megathyrsus maximus) in tropical conditions
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Water stress and warming impact nutrient use efficiency of Mombasa grass (Megathyrsus maximus) in tropical conditions

机译：热带条件下蒙巴萨草（Megathyrsus Maximus）的水分胁迫和升温营养利用效率

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摘要

Temperature and other abiotic factors, such water and nutrient availability, play an important role for plants in response to the changing environments. At this regard, both warming and drought might affect the nutrient use efficiency (NUE) and growth ofMegathyrsus maximusa C4 forage grass of high interest for cattle feeding. However, the nutrient requirements of this species under climate change are unknown. Therefore, we aimed to evaluate the individual and combined effects of two levels of temperature: ambient and elevated temperature (2 degrees C above ambient temperature), and two levels of soil water availability: irrigated plants and non-irrigated plants on accumulation of leaf nutrients, NUE and biomass production ofM. maximus. Temperature control was performed by a temperature free-air-controlled enhancement (T-FACE) system under field conditions. In general, we observed that warming under well-irrigated conditions increased the leaf accumulation of most nutrients, improving the NUE of N, P, K, Ca, Mg, Cu, Mn and Zn. Plant growth was also enhanced under warming effects, with higher leaf dry mass accumulation and root development. Meanwhile, drought decreased NUE of K, Ca, B and leaf dry biomass, while root growth was stimulated. The combined effects of warming and drought on nutrient accumulation, NUE and plant growth tended to be greater than the individual effects expected from a single factor; thus, warming mitigated the negative impacts of individual drought. In summary, our findings suggest that warming and drought, both as individual and combined factors, will change the nutrient requirements ofM. maximusin tropical ecosystems.
机译：温度和其他非生物因素，如水和养分的有效性，对植物响应不断变化的环境起着重要作用。在这方面，气候变暖和干旱都可能会影响营养素利用效率（NUE）和大斑海棠C4饲草的生长，这些饲草对牛的饲养非常重要。然而，该物种在气候变化下的营养需求尚不清楚。因此，我们旨在评估两种温度水平（环境温度和高温（环境温度以上2摄氏度））以及两种土壤水分有效性水平（灌溉植物和非灌溉植物）对叶片养分积累、NUE和生物量产生的单独和综合影响。马克西姆斯。在现场条件下，通过无温度空气控制增强（T-FACE）系统进行温度控制。总体而言，我们观察到，在灌溉条件良好的情况下，变暖增加了大部分养分的叶片积累，提高了N、P、K、Ca、Mg、Cu、Mn和Zn的NUE。在增温效应下，植物的生长也得到了增强，叶片干物质积累和根系发育增加。同时，干旱降低了钾、钙、硼的净利用率和叶片干生物量，促进了根系生长。变暖和干旱对养分积累、NUE和植物生长的综合影响往往大于单一因素预期的个体影响；因此，变暖减轻了个别干旱的负面影响。总之，我们的研究结果表明，变暖和干旱，无论是作为个体因素还是综合因素，都会改变M的营养需求。热带生态系统的最大化。

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