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Urea - International Plant Nutrition Institute
... a process called hydrolysis. During this process, the N in urea is susceptible to undesirable gaseous losses as NH3. Various management techniques can be used to minimize the loss of this valuable nutrient. Urea hydrolysis is a rapid process, typically occurring within several days after applicati ...
... a process called hydrolysis. During this process, the N in urea is susceptible to undesirable gaseous losses as NH3. Various management techniques can be used to minimize the loss of this valuable nutrient. Urea hydrolysis is a rapid process, typically occurring within several days after applicati ...
Basic and Applied Ecology
... A current goal in ecology is to elucidate the relative roles of primary and secondary consumers versus plant resources in determining community structure and dynamics. The complexity and diversity of terrestrial communities has been hypothesized to strongly influence the strength of these topdown an ...
... A current goal in ecology is to elucidate the relative roles of primary and secondary consumers versus plant resources in determining community structure and dynamics. The complexity and diversity of terrestrial communities has been hypothesized to strongly influence the strength of these topdown an ...
Soil health in agricultural systems
... Soil health is a term which is widely used within discussions on sustainable agriculture to describe the general condition or quality of the soil resource. Soil management is fundamental to all agricultural systems, yet there is evidence for widespread degradation of agricultural soils in the form o ...
... Soil health is a term which is widely used within discussions on sustainable agriculture to describe the general condition or quality of the soil resource. Soil management is fundamental to all agricultural systems, yet there is evidence for widespread degradation of agricultural soils in the form o ...
Soil Characteristics
... • The A Horizon– It is usually called the topsoil by most farmers. This is where the organic matter accumulates over time. This layer is very prone to leaching and losing iron and other minerals. The A horizon provides the best environment for the growth of plant roots, microorganisms and ...
... • The A Horizon– It is usually called the topsoil by most farmers. This is where the organic matter accumulates over time. This layer is very prone to leaching and losing iron and other minerals. The A horizon provides the best environment for the growth of plant roots, microorganisms and ...
Soil Characteristics
... • The A Horizon– It is usually called the topsoil by most farmers. This is where the organic matter accumulates over time. This layer is very prone to leaching and losing iron and other minerals. The A horizon provides the best environment for the growth of plant roots, microorganisms and ...
... • The A Horizon– It is usually called the topsoil by most farmers. This is where the organic matter accumulates over time. This layer is very prone to leaching and losing iron and other minerals. The A horizon provides the best environment for the growth of plant roots, microorganisms and ...
Impacts of Warming on the Structure and Functioning of Aquatic
... meaningful variation of a system within a small number of dimensions. That is not to say these are the only variables that matter, rather they help us to simplify the system into something more tractable, which can also then enable us to identify other potentially important variables (e.g. elemental ...
... meaningful variation of a system within a small number of dimensions. That is not to say these are the only variables that matter, rather they help us to simplify the system into something more tractable, which can also then enable us to identify other potentially important variables (e.g. elemental ...
ap biology summer assignment 2009-2010
... 5. Describe the flowchart of inquiry used to determine what limits the geographic distribution of a particular species. 6. Describe the problem of introduced species and the specific problems posed by the introduction of African bees and zebra mussels. 7. Explain the "tens rule." 8. Explain how habi ...
... 5. Describe the flowchart of inquiry used to determine what limits the geographic distribution of a particular species. 6. Describe the problem of introduced species and the specific problems posed by the introduction of African bees and zebra mussels. 7. Explain the "tens rule." 8. Explain how habi ...
Adaptation, density dependence and the responses of trophic level
... The responses of abundances to the extrinsic per capita mortality rates are obtained by differentiating the equilibrium conditions for equations (1a–d) with respect to each of the di. The resulting formulae can be simplified somewhat by assuming that the equilibrium of the system is locally stable. ...
... The responses of abundances to the extrinsic per capita mortality rates are obtained by differentiating the equilibrium conditions for equations (1a–d) with respect to each of the di. The resulting formulae can be simplified somewhat by assuming that the equilibrium of the system is locally stable. ...
A Science-Based Framework for Assessing the
... of CRA fishery species will be affected by changing the state of species or habitats likely to be affected by human activities. The framework allows consideration of both the direct impacts of a project on productivity of CRA fisheries and the potential cumulative impacts when new or increased stres ...
... of CRA fishery species will be affected by changing the state of species or habitats likely to be affected by human activities. The framework allows consideration of both the direct impacts of a project on productivity of CRA fisheries and the potential cumulative impacts when new or increased stres ...
Stoichiometry of actual vs. potential predator–prey interactions
... about the functional consequences of interspecific differences in consumer nutrient demand evident in compiled databases of insect stoichiometry (Elser et al. 2000; Sterner & Elser 2002; Denno & Fagan 2003). However, the unsystematic nature of literature-compiled databases necessarily leaves open a ...
... about the functional consequences of interspecific differences in consumer nutrient demand evident in compiled databases of insect stoichiometry (Elser et al. 2000; Sterner & Elser 2002; Denno & Fagan 2003). However, the unsystematic nature of literature-compiled databases necessarily leaves open a ...
Document
... – Influence of perennial biomass crop production on biodiversity indicators (SRC willow,) – Water consumption of perennial biomass crops ...
... – Influence of perennial biomass crop production on biodiversity indicators (SRC willow,) – Water consumption of perennial biomass crops ...
General Impacts - Invasive Species Specialist Group
... been linked to low numbers of its main predator, the mollusc Charonia tritonis (Triton’s trumpet). In Egypt removal of fish in the families Lethrinidae, Balistidae and Tetraododontidae have been linked to outbreaks of the coral-feeding starfish(Ormond et al. 1990, in PERSGA/GEF 2003). The second ant ...
... been linked to low numbers of its main predator, the mollusc Charonia tritonis (Triton’s trumpet). In Egypt removal of fish in the families Lethrinidae, Balistidae and Tetraododontidae have been linked to outbreaks of the coral-feeding starfish(Ormond et al. 1990, in PERSGA/GEF 2003). The second ant ...
Disturbance - Paul Keddy
... A cotton rope saturated with kerosene was attached to the trunk of trees and temperature of the cambium was monitored with thermocouples inserted 10 cm above the point of attachment of the rope. The length of rope used was one half the diameter of each tree to ensure a standard level of heat exposur ...
... A cotton rope saturated with kerosene was attached to the trunk of trees and temperature of the cambium was monitored with thermocouples inserted 10 cm above the point of attachment of the rope. The length of rope used was one half the diameter of each tree to ensure a standard level of heat exposur ...
Ecology, Second Edition
... CONCEPT 5.1 Organisms obtain energy from sunlight, from inorganic chemical compounds, or through the consumption of organic compounds. 107 Sources of Energy 107 ...
... CONCEPT 5.1 Organisms obtain energy from sunlight, from inorganic chemical compounds, or through the consumption of organic compounds. 107 Sources of Energy 107 ...
Between the Devil and the Deep Blue Sea: The Coastal Zone in an
... is appropriate and effective as a means to achieve sustainability in the coastal zone. Though there are many effective pilot studies, large scale evidence of success is quite limited however. In the United States for example, a recent report concluded that one quarter of coastal lands will be urbani ...
... is appropriate and effective as a means to achieve sustainability in the coastal zone. Though there are many effective pilot studies, large scale evidence of success is quite limited however. In the United States for example, a recent report concluded that one quarter of coastal lands will be urbani ...
Soil Texture and Textural Class
... use and management. It affects the amount of water and nutrients that a soil can hold and supply to plants. Soil physical properties such as structure, and movement of air and water through the soil are affected by texture. ...
... use and management. It affects the amount of water and nutrients that a soil can hold and supply to plants. Soil physical properties such as structure, and movement of air and water through the soil are affected by texture. ...
Parallel ecological networks in ecosystems
... ways, often forming complex networks of various types of ecological interaction. Out of this suite of interactions, predator–prey interactions have received most attention. The resulting food webs, however, will always operate simultaneously with networks based on other types of ecological interacti ...
... ways, often forming complex networks of various types of ecological interaction. Out of this suite of interactions, predator–prey interactions have received most attention. The resulting food webs, however, will always operate simultaneously with networks based on other types of ecological interacti ...
SP10 - Miss S. Harvey
... Ecosystems are normally able to adjust to small changes from within. The importance of abiotic factors cannot be emphasized enough. The difference in abiotic factors like climatic conditions and soil quality determines the distribution of life and contributes to diversity within the biosphere. 2A In ...
... Ecosystems are normally able to adjust to small changes from within. The importance of abiotic factors cannot be emphasized enough. The difference in abiotic factors like climatic conditions and soil quality determines the distribution of life and contributes to diversity within the biosphere. 2A In ...
- Centre for Biodiversity Theory and Modelling
... ways, often forming complex networks of various types of ecological interaction. Out of this suite of interactions, predator–prey interactions have received most attention. The resulting food webs, however, will always operate simultaneously with networks based on other types of ecological interacti ...
... ways, often forming complex networks of various types of ecological interaction. Out of this suite of interactions, predator–prey interactions have received most attention. The resulting food webs, however, will always operate simultaneously with networks based on other types of ecological interacti ...
Parallel ecological networks in ecosystems Olff, Han
... ways, often forming complex networks of various types of ecological interaction. Out of this suite of interactions, predator–prey interactions have received most attention. The resulting food webs, however, will always operate simultaneously with networks based on other types of ecological interacti ...
... ways, often forming complex networks of various types of ecological interaction. Out of this suite of interactions, predator–prey interactions have received most attention. The resulting food webs, however, will always operate simultaneously with networks based on other types of ecological interacti ...
Soil macrofauna (invertebrates) of
... ecosystems (Ruiz et al. 2008). Some fundamental publications are available for steppe macrofauna (soil invertebrates) of the European part and Siberia in Russia summarized by Striganova (1996, 2005). A comparison between the soil macrofauna of floodplains and of well-drained habitats of the European ...
... ecosystems (Ruiz et al. 2008). Some fundamental publications are available for steppe macrofauna (soil invertebrates) of the European part and Siberia in Russia summarized by Striganova (1996, 2005). A comparison between the soil macrofauna of floodplains and of well-drained habitats of the European ...
Abstracts - Society For Range Management
... When pastures are sprayed for the control of broadleaf weeds existing legumes are removed from the plant community. Although prompt re-establishment of legumes in sprayed pastures is a goal of many land managers, this process depends on a number of different factors. Current re-cropping guidelines f ...
... When pastures are sprayed for the control of broadleaf weeds existing legumes are removed from the plant community. Although prompt re-establishment of legumes in sprayed pastures is a goal of many land managers, this process depends on a number of different factors. Current re-cropping guidelines f ...
生態學 - 國立臺南大學
... • The scientific study of the distribution and abundance of organisms and the interactions that determine distribution and abundance. (Townsend, Begon and Happer, 2008) • The primitive humans must have been ecologists of sorts – driven by the need to understand where and when their food and their en ...
... • The scientific study of the distribution and abundance of organisms and the interactions that determine distribution and abundance. (Townsend, Begon and Happer, 2008) • The primitive humans must have been ecologists of sorts – driven by the need to understand where and when their food and their en ...
Special Feature - Cedar Creek Ecosystem Science Reserve
... of these debates to community ecology, is anything really new to this emerging paradigm? I argue that the emerging paradigm is indeed a new and profoundly different view of biotic diversity. I also argue that the debate is the hallmark of an emerging paradigm, and that any new paradigm requires revi ...
... of these debates to community ecology, is anything really new to this emerging paradigm? I argue that the emerging paradigm is indeed a new and profoundly different view of biotic diversity. I also argue that the debate is the hallmark of an emerging paradigm, and that any new paradigm requires revi ...
L E T T E R
... adding variables to determine the significant factors in multiple regression. In most cases, there was only one significant factor in a model, and there were never more than two significant factors in multiple regression. We did not formally evaluate the statistical significance of differences in se ...
... adding variables to determine the significant factors in multiple regression. In most cases, there was only one significant factor in a model, and there were never more than two significant factors in multiple regression. We did not formally evaluate the statistical significance of differences in se ...
Human impact on the nitrogen cycle
Human impact on the nitrogen cycle is diverse. Agricultural and industrial nitrogen (N) inputs to the environment currently exceed inputs from natural N fixation. As a consequence of anthropogenic inputs, the global nitrogen cycle (Fig. 1) has been significantly altered over the past century. Global atmospheric nitrous oxide (N2O) mole fractions have increased from a pre-industrial value of ~270 nmol/mol to ~319 nmol/mol in 2005. Human activities account for over one-third of N2O emissions, most of which are due to the agricultural sector. This article is intended to give a brief review of the history of anthropogenic N inputs, and reported impacts of nitrogen inputs on selected terrestrial and aquatic ecosystems.