文章基本信息

标题：Characterization of Water Retention Curves for a Series of Cultivated Histosols
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作者：Dennis W. Hallema ; Yann Périard ; Jonathan A. Lafond 等
期刊名称：Vadose Zone Journal
电子版ISSN：1539-1663
出版年度：2015
卷号：14
期号：6
页码：1-7
DOI：10.2136/vzj2014.10.0148
出版社：Soil Science Society of America, Inc.
摘要：Water retention curves are essential for the parameterization of soil water models such as HYDRUS. Although hydraulic parameters are known for a large number of mineral and natural organic soils, our knowledge on the hydraulic behavior of cultivated Histosols is rather limited. The objective of this study was to derive characteristic water retention curves for a large cultivated peatland with lettuce ( Lactuca sativa L.) and vegetable farming in southern Quebec, Canada. A comparison showed that the van Genuchten model fits better to the water retention data obtained with a Tempe pressure cell experiment than the Groenevelt–Grant model in terms of residual sum of squares; however, the difference in performance was quite small due to the high number of iterations used for fitting. Finally, an agglomerative cluster analysis of 85 peat samples allowed us to define two distinct water retention curves, where the first water retention curve described samples of relatively shallow (<150 cm) Histosols with an organic content 0.3 g cm −3 , which are the soils that suffered a more dramatic transformation as a result of agriculture. This characterization allows for a multitude of applications, including parameterization of the HYDRUS model for soil water movement, and presents an essential tool for the optimization of water management in cultivated peatlands.
关键词：BFGS; Broyden–Fletcher–Goldfarb–Shanno.