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Intradiurnal and seasonal variability of soil temperature, heat flux, soil moisture content, and thermal properties under forest and pasture in Rondonia

机译:朗多尼亚森林和牧场下土壤温度,热通量,土壤水分含量和热性质的季节和季节变化

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摘要

Soil temperatures depend on the soil heat flux, an important parameter in meteorological and plant growth-energy balance models. Thus, they were measured, together with soil moisture contents, within the LBA program at forest (Reserva Jaru) and pasture (Fazenda Nossa Senhora) sites in Rondonia, Brazilian Amazonia during wet (February) and dry (August) periods of 1999. The wet period showed maxima of the heat flux into the soil around five to six times smaller at the forest than at the pasture, except for some spikes that are related to stronger solar forcing, such as those due to sunspecks in the forest. This pattern remained during the dry period, but with doubled maximum values. Also, the soil heat flux and the soil temperatures responded very significantly to the passage of cold fronts in both periods at both sites. Temperature profiles measured in the 0.10-0.40 m soil layer showed daily averages and ranges smaller at the forest than at the pasture. The daily average of the soil moisture content in the same layer, during the wet season, increased with depth at both sites, with consistently lower values at the forest. However, their ranges were smaller at the pasture, except for the 0.40 m depth. During the dry period, these ranges were much higher at the pasture, but with nearer average values. Finally, the computed daily apparent soil thermal diffusivities, volumetric heat contents, and thermal conductivities are presented, with the first ones crossed with the measured soil moisture content.
机译:土壤温度取决于土壤热通量,这是气象和植物生长-能量平衡模型中的重要参数。因此,在1999年的潮湿(二月)和干燥(八月)期间,在巴西亚马逊河朗多尼​​亚森林(Reserva Jaru)和牧场(Fazenda Nossa Senhora)的LBA计划中对它们与土壤水分含量进行了测量。湿润期显示,进入森林的土壤热通量最大,比牧场上的牧草要少五到六倍,除了一些与强烈的太阳强迫有关的峰值(例如森林中的阳光斑点)。这种模式在干燥期间保持不变,但最大值翻了一番。而且,在两个地点的两个时期,土壤热通量和土壤温度对冷锋的通过都具有非常显着的响应。在0.10-0.40 m的土壤层中测得的温度剖面显示出每天的平均值,并且在森林中的温度范围比在牧场的情况小。在雨季中,同一层土壤日含水量的日平均值在两个地点均随深度的增加而增加,而在森林中始终较低。但是,除了0.40 m的深度外,它们在牧场上的范围较小。在干旱时期,这些范围在牧场上要高得多,但平均值都比较近。最后,给出了计算出的每日表观土壤热扩散率,体积热含量和热导率,第一个与测量的土壤水分含量相交。

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