Soil biota account for ~25% of global biodiversity and underpins a wide range of ecosystem services. Here defined as soil-dwelling bacteria, archaea, fungi, protists, animals, and viruses, soil biota have often been overlooked and generalised in biodiversity surveys and studies …
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This thesis investigates whether or not track workers living at a railroad station in Inyo County, California, cultivated gardens. Kearsarge, the site chosen for this investigation, was a station on the Carson & Colorado/Southern Pacific Narrow Gauge Railroad from 1883 until 196…
Grasslands over a quarter of land free area and due to large carbon (C) stock they represent a key global C pool. Grassland soil C sequestration is an alternative method for reduction of atmospheric carbon dioxide (CO2) which can also deliver other benefits including greater eco…
Herbivory by migratory animals in high-latitude ecosystems is known to impact greenhouse gas emissions from soils. However, few studies quantify the relationships between changes herbivores make to plant communities and soil conditions, and the biological interactions soil organ…
Nitrate contamination of surface and groundwater has become a serious concern in many agricultural areas throughout the world. The major source of nitrate contamination is believed to be nitrogen fertilizer from agricultural fields. Best Management Practices have been developed …
Soil properties functionally associated with soil quality are largely controlled by active organic carbon. In this study a simple test of active carbon was evaluated as a of soil quality. Sixty-one soils representing a wide range of properties were analyzed for total and active …
This study mainly deals with agricultural practices and farmers' strategies to adapt to diverse and complex agro-ecological and socio-economic environments in a selected village in Bangladesh. It seeks to elucidate the complex choices of the new agricultural technology introduce…
Liquefaction is a major earthquake-induced hazard that has been studied extensively through the years but still poses significant challenges to researchers and practitioners, even for level-ground free-field conditions. Case histories, laboratory tests at different scales, from …
More than 150 year after the Irish potato famine, blight caused by Phytophthora infestans (Mont.) de Bary has re-emerged as a major disease worldwide. In Morocco, tomatoes (Lycorpersicum esculentum Mill.) and potatoes (Solanum tuberosum L.) have become an important segment of th…
The pollution of soils by trace elements and heavy metals is a grave environmental problem, mainly due to their toxic and accumulative properties. The levels of lead, cadmium, copper, chromium, nickel, zinc and cobalt, extractable with 0.5 M acetic acid, have been determined in …
Agroforestry parklands are agroforestry systems where trees are mixed with crops on the same unit of land. These tree-crop associations can have a positive, a negative or no effect on the soil or on the growth and yield of the plants. Foliar biomass production of the tree, Cordy…
The fate of contaminant migration through the subsurface environment as well as their potential hazard to humans, animals, and aquatic life has become one of the major current concerns of the scientific community. Accordingly, various theoretical and experimental studies have be…
This study is a first attempt aimed to establish a record of identification, taxonomic characterization, and spatial distribution of arenicolous filamentous fungi in Mayagüez Bay, Western Puerto Rico. The primary goal of this study was to provide a better understanding of the fu…
Two greenhouse studies were undertaken: (1) To assess the effects of prescribed fire frequency on AM spore abundance, species variety, and AM percent root colonization of Sudan grass Sorghum Sudanese L., between an annually burned site (#11), and a seven-year burned site (# 24) …
Weak organic acids and/or their salts were tested as soil washing or flushing agents for the ex- or in-situ remediation of soils polluted by heavy metals. Three soils naturally with heavy metals were used for the tea. The three soils were characterized as a clay loam, loam and s…
Carbon sequestration in small-scale farming systems in semi-arid regions offers the possibility to increase local soil fertility, improve crop yields, enhance rural people’s wellbeing, and strengthen the resilience of agricultural systems while reducing CO2 accumulation in the a…
The goal of this research is to understand how and why tree diversity changes during 200 years of shifting cultivation in a tropical rainforest. To determine the relative importance of dispersal and nutrient limitation to tree diversity, I collected data on changes in the struct…
The existence of root exudates has been known for a long time. Their role and function in plant nutrition and soil chemistry have only recently begun to be understood. Studies have demonstrated that the primary constituents of the root exudates are low molecular weight organic a…
The work reported here describes the water distribution patterns in sandy loam and silt loam soils under surface and micro-irrigation at different temperatures simulating the arid region conditions such as those experienced in the Balochistan Province of Pakistan. Specific consi…