A5078907584- Soil and Unsaturated Flow
- Plant Water Relations and Carbon Dynamics
- Irrigation Practices and Water Management
- Groundwater flow and contamination studies
- Soil Carbon and Nitrogen Dynamics
- Soil and Water Nutrient Dynamics
- Horticultural and Viticultural Research
- Plant Physiology and Cultivation Studies
- Soil Moisture and Remote Sensing
- Hydrology and Watershed Management Studies
- Soil erosion and sediment transport
- Fire effects on ecosystems
- Heavy metals in environment
- Water resources management and optimization
- Groundwater and Isotope Geochemistry
- Pesticide and Herbicide Environmental Studies
- Land Use and Ecosystem Services
- Landslides and related hazards
- Clay minerals and soil interactions
- Greenhouse Technology and Climate Control
- Forest ecology and management
- Geophysical and Geoelectrical Methods
- Environmental Impact and Sustainability
- Hydrology and Sediment Transport Processes
- Plant nutrient uptake and metabolism
Plant & Food Research
2015-2024
Massey University
1977-2014
Palmerston North Hospital
1980-2014
AgResearch
2001-2013
Government of New Zealand
2013
Planta
1999-2010
Crown Research Institutes
2009
Kansas State University
2007
Association of Public and Land-grant Universities
2007
University College London
2004
Soil moisture (SM) is essential for sustaining services from Earth’s critical zone, a thin-living skin spanning the canopy to groundwater. In Anthropocene epoch, intensive afforestation has remarkably contributed global greening and certain service improvements, often at cost of reduced SM. However, attributing response SM in deep soil such human activities great challenge because scarcity long-term observations. Here, we present 37 y (1985 2021) analysis dynamics two scales across China’s...
Heat pulse methods can be used for accurate measurements of sap flow in plant stems provided a reliable calibration procedure is to relate the measured heat velocity actual flow. This paper reviews theory underpinning both compensation and T‐max that use linear heater temperature probes inserted radially into stem. These not only disrupt stream, but they also alter thermal homogeneity sapwood vicinity probes. The degree disturbance depends on size geometry corresponding wound width...
Journal Article Water Use of Kiwifruit Vines and Apple Trees by the Heat-Pulse Technique Get access S. R. GREEN, GREEN Plant Physiology Division, DSIRPalmerston North, New Zealand Correspondence to: DSIR, Private Bag, Palmerston Search for other works this author on: Oxford Academic PubMed Google Scholar B. E. CLOTHIER Experimental Botany, Volume 39, Issue 1, January 1988, Pages 115–123, https://doi.org/10.1093/jxb/39.1.115 Published: 01 1988 history Received: 27 July 1987
Measurements of intrinsic sorptivity (S*) by using both ethanol and water were used to indicate the extent water-repellency in soil. Experiments with initially dry, acid-purified sand verified that a non-repellent, nonswelling porous medium S' was indeed medium, independent sorbing liquid. For water-moist, non-repellent sand, measured S* different when invading fluids. But bound can be put on this difference. It concluded structurally stable soils, ratio from for may as an index...
An analysis for scaling the exponential soil water diffusivity function, D(θ), from concurrent measurements of sorptivity and wet front advance is presented. This provides a field method measuring β, slope D(θ). For Bungendore fine sand in it was found that β = 3. contrary to absorption experiments on variety repacked soils have consistently 8 led suggestion may be “universal” value applicable all soils. Although function with 3 provided usable approximation over entire θ range, D(θ) data...
Summary Soil is the first filter of world’s water; its buffering and filtering determine quality quantity our reserves subterranean surface water. Preferential flow can either enhance, or curtail, capacity soil to buffer filter, it compromise, boost, other ecosystem services. We ask ‘when do preferential transport matter?’ identify 12 17 services that benefit from three are affected detrimentally. estimate by simple arithmetic value be globally some US$304 billion (10 9 ) per year. review...
SUMMARY A new field method of obtaining, with minimal disturbance, the unsaturated hydraulic conductivity ( K 0 ) and sorptivity S from unconfined disc permeameter measurements is introduced. Conventionally, obtained initial square‐root‐of‐time behaviour discharge permeameter. In some cases this can be difficult to measure, in part because multi‐dimensional flows approach quasi‐steady state very rapidly. As an alternative we extend ponded twin‐ring discs several radii. This has advantage...
In this paper, the constant head well per-meameter (CHWP) theory is extended analytically to account for effects of unsaturated flow. This results in a more accurate estimate field-saturated hydraulic conductivity and new methods situ estimation soil sorptivity α parameter exponential conductivity-pressure function. Calculations using CHWP “average”sand, loam, clay soils indicate that original only slightly error exhibiting weak capillarity, but can be substantially strong capillarity. The...
Abstract. In this paper, we present and analyze a novel global database of soil infiltration measurements, the Soil Water Infiltration Global (SWIG) database. total, 5023 curves were collected across all continents in SWIG These data either provided quality checked by scientists who performed experiments or they digitized from published articles. Data 54 different countries included with major contributions Iran, China, USA. addition to its extensive geographical coverage, cover research...
The ecosystem services approach endeavors to incorporate the economic value of ecosystems into decision making. This is because many natural resources are subject market failure. As a result, decisions omit impact that resource use has on earth's and life support system it provides. Hence, one objectives employ valuation in micro- macroeconomic policy design, implementation, evaluation. In this article we examine concepts, ask why might attempt economically contribution soils provision...
Root water uptake and the dynamic availability of to plants is a phenomenon that tends be overlooked by soil scientists, despite often dominant role roots as sink for in soil. Water taken up vital plant growth productive management soils. In addition, trapping consuming rootzone means there less remaining act vehicle carry chemicals beyond grasp consign them either receiving groundwater bodies or surface reserves. Here we review landmark developments theoretical description roots. By 1960s,...
The saturated hydraulic conductivity, K s , was measured on a loamy sand, fine sandy loam, silt loam and clay at four 100-m 2 -area sites in southern Ontario. Twenty measurements of were obtained by each three different measurement techniques the sites. included: (1) air-entry permeameter method; (2) constant head well method using Guelph Permeameter; (3) falling-head applied to small soil cores. data found be better described log-normal frequency distribution than normal distribution....