| 黄土高原南部土壤水分有效性研究 |
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| 引用本文： | 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. |
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| 作者姓名： | 郭庆荣 李玉山 |
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| 作者单位： | 中国科学院、水利部西北水土保持研究所, 712100;中国科学院、水利部西北水土保持研究所, 712100 |
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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％的壤湿度范围内，随着土壤湿度的不小，土壤水分对植物的有效性按抛线规律递减，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
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| 关 键 词： | 土壤水分 有效性 黄土高原南部 |
SOIL MOISTURE AVAILABILITY TO PLANT IN THE SOUTHERN THE LOESS PLATEAU |
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| Guo Qingrong and 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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| Authors: | Guo Qingrong and Li Yushan |
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| Institution: | Northwester Institute of Soil and Water Conservation, Academia Sinica and Ministry of Water Conservancy, 712100;Northwester Institute of Soil and Water Conservation, Academia Sinica and Ministry of Water Conservancy, 712100 |
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| 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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| Keywords: | Soil moisture availability Soil moisture easy-absorbability Methematical model Water uptake by roots Field capacity the south of the Loess Plateau |
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