Estimating Soil Water Contents from Soil Temperature Measurements by Using an Adaptive Kalman Filter From: Journal of Applied Meteorology | Date: February 1, 2004| Author: Qiu, Chong-Jian; Xu, Qin; Zhang, Shu-Wen | Copyright American Meteorological Society Feb 2004. Provided by ProQuest LLC.Copyright information

ABSTRACT

A simple soil heat transfer model is used together with an adaptive Kalman filter to estimate the daily averaged soil volumetric water contents from diurnal variations of the soil temperatures measured at different depths. In this method, the soil water contents are estimated as control variables that regulate the variations of soil temperatures at different depths and make the model nonbiased, while the model system noise covariance matrix is estimated by the covariance-match...

Related newspaper, magazine, and journal articles from HighBeam Research

	Ecological characteristics of soil water and its relations to landform and vegetation in a small semiarid watershed in a loess hilly area of China International Journal of Sustainable Development and World Ecology ; Key words: Ecological environment of soil water, dry soil layer, farming with rainwater harvesting technology, Gansu Province, Loess Plateau SUMMARY There is an urgent need to study soil water resources and eco-hydrological characteristics in depth so as to carry forward ecological environmental
	Cover crop effects on soil water relationships. Journal of Soil and Water Conservation ; Cover crops are grown, for the following reasons (among others): * to provide soil cover and erosion control during otherwise non-cropped periods; * to immobilize soluble nutrients (nitrates) to prevent their loss by leaching; * to convert atmospheric nitrogen (by legumes) to biomass nitrogen that
	Note of clarification about: field and laboratory calibration and test of TDR and capacitance techniques for indirect measurement of soil water content, by P. N. J. Lane and D. H. Mackenzie, Vol. 39, pp. 1371-1386.(Brief Article) Australian Journal of Soil Research ; Lane and Mackenzie (2001) presented a series of curves characterising the soil water content-dielectric constant relationship based on empirical equations from different sources (Fig. 6). It should be noted that the Nadler et al. (1991) curve was extrapolated past the limits of their original
	Variability of soil water content and bulk density in a sugarcane field.(Statistical Data Included) Australian Journal of Soil Research ; Introduction Soil water content and bulk density are parameters commonly used to characterise and to study the physical behaviour of soils in agronomic systems. They have a fundamental influence on important soil and plant processes such as water movement, soil compaction, tillage, and root growth.
	Field and laboratory calibration and test of TDR and capacitance techniques for indirect measurement of soil water content. Australian Journal of Soil Research ; Introduction Two techniques were used to obtain volumetric soil water content in an intensive water balance study of a small catchment. The techniques were time domain reflectometry (TDR) and a frequency domain sensor, the Didcot capacitance probe (CP). Laboratory and field experiments were
	Winter Wheat and Grain Sorghum Production as Influenced by Depth of Soil Water, Tillage and Cropping System.(Statistical Data Included) Journal of Soil and Water Conservation ; ABSTRACT A 24 year study offive cropping systems was conducted to detennine how 1.) cropping systems, 2.) depth of soil water at planting, and 3.) tillage systems affected yields and economic returns. The study involved two crops, winter wheat (Triticum aestivum L.) and grain sorghum (Sorghum
	Does Variation in Soil Water Content Induce Variation in the Size of Hatchling Snapping Turtles (Chelydra serpentina)? Copeia ; Most studies that have investigated the influence of hydric conditions during incubation on the size and quality of hatchling reptiles have used either vermiculite or sand as the incubation medium, and the applicability of data derived from eggs using one media type or the other to natural
	TEMPORAL DYNAMICS OF SOIL WATER IN OAK FOREST STAND OF SOUTHERN SLOVAKIA Ekológia ; Abstract Tuzinsk L.: Temporal dynamics of soil water in oak forest stand of Southern Slovakia. Ekolgia (Bratislava), Vol. 24, No. 3, 304-313, 2005. Time and spatial variability of the soil water depends on the weather characteristic course, on soil hydrophysical characteristics and on forest stand
	Soil water storage and precipitation storage efficiency of conservation tillage systems. Journal of Soil and Water Conservation ; Wheat (Triticum aestivum L.) production in the semi-arid Northern Plains is limited by low and variable precipitation. Fallow is used in wheat production areas receiving 400 mm (16 in.) or less annual precipitation to increase soil water storage, reduce the likelihood of crop failure, control
	Soil water depletion by C3 and C4 pasture grasses in central Appalachia. Journal of Soil and Water Conservation ; The Appalachian Region was vegetated almost entirely by forests when European settlers arrived. Although the settlers cleared some land for cropping, the steep topography was generally unsuitable for cropping but was productive on a sustainable basis under pasture. Pastures that developed in forest

See all results.