黄土高原南部土壤水分有效性研究
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* 国家自然科学基金


SOIL MOISTURE AVAILABILITY TO PLANT IN THE SOUTHERN THE LOESS PLATEAU
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    摘要:

    本文采用田间模拟土柱试验方法,利用作物产量-水分关系的数学模型和植物根系吸收土壤水分的数学模型,定量地研究了黄土高原南部土壤水分对植物有效性的动态规律,两种模拟方法得到了相同的结果,即在田间持水量的95%到55%的土壤湿度范围内,随着土壤湿度的不断减小,土壤水分对植物的有效性按抛物线规律递减,而且下降的速度越来越快;同时还简析了不同土壤水分有效性观点存在的原因,以及土壤水分有效性与土壤水分易吸性相一致或相似的条件。

    Abstract:

    The field simulation column method was employed to study quantitatively the dynamic law of soil moisture availability to plant in the southern Loess Plateau, by using a methematical modle on the relation between crop yield and soil moisture and a mathematical modle of soil moisture absorption by plant roots. The same results were achieved by the above-mentioned mathematical modles, i. e., when the soil moisture changes from 95% to 55% of the field capacity, with the soil moisture decresing gradually, the soil moisture availability to plant decreased parabolically, dropping faster and faster. Meanwhile, the reasons resulting in different viewpoints on the soil moisture availability and the condition in which the soil moisture availability is in agreement with the soil muisture easy-absorbability are discussed briefly.

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郭庆荣,李玉山.黄土高原南部土壤水分有效性研究[J].土壤学报,1994,31(3):236-243. Guo Qingrong, Li Yushan. SOIL MOISTURE AVAILABILITY TO PLANT IN THE SOUTHERN THE LOESS PLATEAU[J]. Acta Pedologica Sinica,1994,31(3):236-243.

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  • 在线发布日期: 2013-02-25
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