We studied the impacts of anthropogenic changes in land use on the stoichiometric imbalance of soil carbon (C), nitrogen (N), phosphorus (P) and potassium (K) in Phragmites australis wetlands in the Minjiang River estuary. We compared five areas with different land uses: P. australis wetland (control), grassland, a mudskipper breeding flat, pond aquaculture and rice cropland. Human activity has...

• Soil hydrologic parameters including field saturation, field capacity, initiation of plant water stress and plant extraction limits can be reliably determined from electronic soil moisture sensor records. • Soil profile wetting and drying occurs along a regular continuum of soil moisture following the advance of the wetting from to the effective base of the soil profile. • Frozen soil conditi...

Soil contamination is a worldwide problem. Soil remediation is often carried out to reduce the risks posed by contaminants in the soil to human health and environment. Contaminant concentration is typically the only soil quality aspect maintained in remediation projects. However, emerging regulatory requirements on soil protection has introduced the soil function concept and demand that other c...

............................................................................................................. viii CHAPTER 1: GENERAL INTRODUCTION ...................................................... 1 Dissertation Organization .................................................................................... 2 Literature Cited ..................................................................

The Mars Environmental Compatibility Assessment (MECA) instrument was designed, built, and flight qualified for the now canceled MSP (Mars Surveyor Program) '01 Lander. The MECA package consisted of a microscope, electrometer, material patch plates, and a wet chemistry laboratory (WCL). The primary goal of MECA was to analyze the Martian soil (regolith) for possible hazards to future astronauts...

Driven by climate change and population growth, increasing human pressure on land forces conversion of natural landscapes to agricultural fields and pastures while simultaneously depleting land currently under agricultural use (Lal, 2009). Consequently, a vicious circle develops; further aggravating climate change, soil degradation, erosion, loss of soil organic matter (SOM) and leaching of nut...

El Niño events play important roles in influencing the hydroclimatology over the Mississippi River Basin (MRB). This study shows that the two types of El Niño events, the central Pacific (CP) El Niño and eastern Pacific (EP) El Niño, have opposite effects on spring soil water hydrology in the MRB. Above-normal spring (March) precipitation during EP El Niño years leads to higher soil water level...

SSSAJ: Volume 75: Number 1 • January–February 2011 Soil Sci. Soc. Am. J. 75:92–101 Posted online 17 Nov. 2010 doi:10.2136/sssaj2009.0414 Received 9 Nov. 2009. *Corresponding author ([email protected]). © Soil Science Society of America, 5585 Guilford Rd., Madison WI 53711 USA All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic ...

The purpose of this study was to develop an approach to estimate soil surface parameters from C-band polarimetric SAR data in the case of bare agricultural soils. An inversion technique based on multi-layer perceptron (MLP) neural networks was introduced. The neural networks were trained and validated on a noisy simulated dataset generated from the Integral Equation Model (IEM) on a wide range ...