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Effect of rainfall patterns on soil surface CO2 efflux soil moisture soil temperature and plant growth in a grassland ecosystem of northern Ontario Canada: implications for climate change

机译:降雨模式对加拿大安大略省北部草地生态系统中土壤表面CO2排放土壤湿度土壤温度和植物生长的影响:对气候变化的影响

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摘要

BackgroundThe effect of rainfall patterns on soil surface CO2 efflux, soil moisture, soil temperature and plant growth was investigated in a grassland ecosystem of northern Ontario, Canada, where climatic change is predicted to introduce new precipitation regimes. Rain shelters were established in a fallow field consisting mainly of Trifolium hybridum L., Trifolium pratense L., and Phleum pratense L. Daytime ambient air temperatures within the shelters increased by an average of 1.9°C similar to predicted future increases in air temperatures for this region. To simulate six precipitation regimes which cover the maximum range to be expected under climate change, a portable irrigation system was designed to modify the frequency of monthly rainfall events with a constant delivery rate of water, while maintaining contemporary average precipitation volumes. Controls consisted of blocks irrigated with frequencies and total monthly precipitation consistent with the 25 year average rainfall for this location.
机译:背景技术在加拿大安大略省北部的草地生态系统中,研究了降雨方式对土壤表面CO2排放,土壤水分,土壤温度和植物生长的影响,据预测,气候变化将引入新的降雨机制。在休耕田中建立了雨棚,该雨棚主要由Tri叶草,Tri叶草和Ph叶草组成。雨棚内的白天周围空气平均温度平均升高1.9°C,与预测的未来空气温度升高相似这个地区。为了模拟涵盖气候变化所预期的最大范围的六种降水方式,设计了便携式灌溉系统,以恒定的水传输速率修改每月降雨事件的频率,同时保持当前的平均降水量。控件由灌溉频率和与该地区25年平均降雨量一致的每月总降水量的块组成。

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