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首页> 外文期刊>International journal of soil science >Effects of Rewetting of Air-Dry Soil and Adaptation to Low Matric and Osmotic Potential
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Effects of Rewetting of Air-Dry Soil and Adaptation to Low Matric and Osmotic Potential

机译：干湿土壤的再湿润及其对低基质和渗透势的适应

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When conducting incubation experiments to measure soil respiration in response to a given treatment in soils of different texture, it is important to have baseline information about the soils and to ensure that the effect of the storage or pre-incubation conditions on the results are minimized. Three experiments were conducted with up to seven soils (3 non-saline, 4 saline) to investigate (1) The relationship between soil water content or water potential and soil respiration,(2) The time required until soil respiration is stabilized after rewetting of air-dry soil and(3) If pre-incubation at a given matric or osmotic potential changes the response of soil respiration to matric or osmotic potential. The texture of the soils varied from sand to sandy loam. Cumulative respiration showed an optimum curve in response to differential soil water content in all 7 soils, but the maximal cumulative respiration was reached at different water content in the soil, being 45 g kg~(-1) for the non-saline sand and 200 g kg~(-1) for the non-saline sandy loam. However, when expressedagainst water potential, maximal cumulative respiration was achieved between 0 and -1 MPa in all soils. Rewetting of air-dry soil induced a flush of respiration in the first 1-2 days, but respiration rates stabilized 7-8 days after rewetting in all soils. Pre-incubation at low matric or osmotic potential for two weeks did not significantly affect soil respiration at low matric or osmotic potential in the following two weeks compared to soils which had been pre-incubated at optimal matric potential and high osmotic potential. In conclusion, when comparing the response of respiration to water availability among soils of different texture it is important to consider water potential and not water content. Furthermore, an adaptation period of 2 weeks does not seem to increase the tolerance of soil respiration to low osmotic or matric potential compared to non-adapted soils.
机译：在进行温育实验以测量在不同质地的土壤中对特定处理的响应时的土壤呼吸时，重要的是要掌握有关土壤的基线信息，并确保将存储条件或预温育条件对结果的影响降到最低。在多达7种土壤（3种非盐，4种盐水）上进行了3个实验，以研究（1）土壤含水量或水势与土壤呼吸之间的关系;（2）重新湿润土壤后直至土壤呼吸稳定所需的时间空气干燥的土壤和（3）如果在给定的基质或渗透势下进行预培养会改变土壤呼吸对基质或渗透势的响应。土壤的质地从沙子到砂壤土不等。在7种土壤中，累积呼吸响应于不同的土壤含水量而呈现最佳曲线，但是在不同含水量的土壤中达到最大累积呼吸，对于非盐度沙土为45 g kg〜（-1），对于200非盐质沙质壤土的克数kg〜（-1）。但是，当以水势表示时，在所有土壤中都达到了0到-1 MPa之间的最大累积呼吸。在空气干燥的土壤中重新润湿会在头1-2天引起呼吸潮红，但是在所有土壤中重新润湿后7-8天呼吸速率都趋于稳定。与在最佳基质势和高渗透势下进行预培养的土壤相比，在低基质势或渗透势下进行预培养两周不会在以后两周内显着影响低基质势或渗透势下的土壤呼吸。总之，在比较不同质地土壤的呼吸作用对水分有效性的响应时，重要的是要考虑水势而不是水分。此外，与不适应的土壤相比，适应期为2周似乎并未增加土壤呼吸对低渗透或基质潜能的耐受性。

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