共查询到20条相似文献，搜索用时 46 毫秒
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Werner Müller-Ahlten 《植物养料与土壤学杂志》1994,157(5):333-343
On the genesis of tidal marsh soils II. Carbonate sedimentation, decalcification A central problem of the tidal-marsh soils is the calcareous deposit of the parent material. On the basis of small-scale, systematic investigations it has been demonstrated in two “key areas” in the Weser tidal flats, that fluviatile and brackish soils are descended from calcareous or not-calcareous sediments. Soils buildet from calcareous sediments shows a low depth and a low rate of decalcification because of a high content of clay and bases as well a permanent high level of groundwater during the development of the soils. 相似文献
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H. Wiechmann 《植物养料与土壤学杂志》1985,148(6):701-701
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R. R. van der Ploeg 《植物养料与土壤学杂志》1984,147(5):641-641
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Soil hydrological methods for investigations on undisturbed samples of skeleton-rich soils New methods are proposed, which allow the determination of moisture transmission properties of stony soils. A soil sampling technique is discussed whereby small monoliths are isolated from the surrounding soil and covered with polyester-soaked glassfiber sheets. With use of such irregularly shaped columns the soil moisture characteristic and the unsaturated hydraulic conductivity are determined by laboratory procedures. Starting with a saturated column, suction is applied and the resulting outflow is measured. At the same time the suction in the sample is registered and also the hydraulic gradient within the sample is determined. Also discussed is a procedure to install tensiometers in stony soils. The installation provides reliable data and the maintenance is easy. By building in a heating system in the tensiometers, these can be operated all year round. 相似文献
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K. H. Hartge 《植物养料与土壤学杂志》1977,140(1):121-121
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