Kristofer Johnson
Datos Biográficos
| ID | 6450101 |
|---|---|
| NOMBRE | Kristofer Johnson |
| NOMBRES | Kristofer |
| APELLIDO | Johnson |
| FIRMA | JOHNSON K |
| AFILIACIONES | Brigham Young University |
| ORCID | 0000-0002-4015-6910 |
| VERIFICADO | Sí |
| TOTAL DE OBRAS | 9 |
| TOTAL DE CITAS | 28 |
| TOTAL COMO AUTOR | 9 |
| TOTAL COMO EDITOR | 0 |
| PRIMER AÑO DE PUBLICACIÓN | 1998 |
| AÑO MÁS RECIENTE DE PUBLICACIÓN | 2019 |
| ÍNDICE H | 3 |
Beyond MRV
Forests are important ecosystems that are under increasing pressure from human use and environmental change, and have a significant ability to remove carbon dioxide from the atmosphere, and are therefore the focus of policy efforts aimed at reducing deforestation and degradation as well as increasing afforestation and reforestation for climate mitigation. Critical to these efforts is the accurate monitoring, reporting and verification of current …
High-resolution mapping of aboveground biomass for forest carbon monitoring system in the Tri-State region of Maryland, Pennsylvania and Delaware, USA
Accurate estimation of forest aboveground biomass at high-resolution continues to remain a challenge and long-term goal for carbon monitoring and accounting systems. Here, we present an exhaustive evaluation and validation of a robust, replicable and scalable framework that maps forest aboveground biomass over large areas at fine-resolution by linking airborne lidar and field data with machine learning algorithms. We developed this framework over…
Estimating aboveground live understory vegetation carbon in the United States
Despite the key role that understory vegetation plays in ecosystems and the terrestrial carbon cycle, it is often overlooked and has few quantitative measurements, especially at national scales. To understand the contribution of understory carbon to the United States (US) carbon budget, we developed an approach that relies on field measurements of understory vegetation cover and height on US Department of Agriculture Forest Service, Forest Invent…
Permafrost and organic layer interactions over a climate gradient in a discontinuous permafrost zone
Permafrost is tightly coupled to the organic soil layer, an interaction that mediates permafrost degradation in response to regional warming. We analyzed changes in permafrost occurrence and organic layer thickness (OLT) using more than 3000 soil pedons across a mean annual temperature (MAT) gradient. Cause and effect relationships between permafrost probability (PF), OLT, and other topographic factors were investigated using structural equation …
How Widowhood Shapes Adult Children's Responses to Mothers' Preferences for Care
Research has shown that mothers are at an increased risk for declining psychological well-being when caregiving preferences are not met. Findings from this study suggest that mothers who are divorced or have been widowed for several years may be at greater risk for violation of their caregiving preferences, increasing their vulnerability to declines in psychological well-being
Application of carbon isotope analysis to ancient maize agriculture in the Petexbatún region of Guatemala
The ancient Maya subsisted in an environment limited by shallow soils and unpredictable weather patterns until their collapse ∼A.D. 800–900. Ancient subsistence can be a difficult subject, with little physical evidence of agricultural artifacts and structures. This study characterized soil profiles and utilized changes in stable carbon isotope ratios of soil organic matter (SOM) to locate and interpret areas of ancient C 4 plant growth and maize …
Soil resources of the Motul de San José Maya
Investigations of soil resources in the department of Petén, Guatemala can provide important insight into the agricultural and land use strategies of the ancient Maya. The site of Motul de San José, located 3 km north of Guatemala's Lago Petén Itzá, is situated in the core zone of Classic Maya civilization and in an area currently inhabited by the modern Itzá Maya. This area was occupied and farmed from the Middle Preclassic period ( ̃600 B.C.) t…
Ancient soil resources of the Usumacinta River Region, Guatemala
Preventing and Reducing Alcohol and Other Drug Use among High-Risk Youths by Increasing Family Resilience
This study examines the effects of a community-based program designed to delay onset and reduce the frequency of alcohol and other drug (AOD) use among high-risk youths, ages 12 to 14, through strengthening family resilience. It is part of a larger five-year demonstration project funded by the Center for Substance Abuse Prevention (CSAP). The program was implemented in multiple church communities in rural, suburban, and inner-city settings. Progr…
Ancient soil resources of the Usumacinta River Region, Guatemala
Preventing and Reducing Alcohol and Other Drug Use among High-Risk Youths by Increasing Family Resilience
This study examines the effects of a community-based program designed to delay onset and reduce the frequency of alcohol and other drug (AOD) use among high-risk youths, ages 12 to 14, through strengthening family resilience. It is part of a larger five-year demonstration project funded by the Center for Substance Abuse Prevention (CSAP). The program was implemented in multiple church communities in rural, suburban, and inner-city settings. Progr…
Soil resources of the Motul de San José Maya
Investigations of soil resources in the department of Petén, Guatemala can provide important insight into the agricultural and land use strategies of the ancient Maya. The site of Motul de San José, located 3 km north of Guatemala's Lago Petén Itzá, is situated in the core zone of Classic Maya civilization and in an area currently inhabited by the modern Itzá Maya. This area was occupied and farmed from the Middle Preclassic period ( ̃600 B.C.) t…
Application of carbon isotope analysis to ancient maize agriculture in the Petexbatún region of Guatemala
The ancient Maya subsisted in an environment limited by shallow soils and unpredictable weather patterns until their collapse ∼A.D. 800–900. Ancient subsistence can be a difficult subject, with little physical evidence of agricultural artifacts and structures. This study characterized soil profiles and utilized changes in stable carbon isotope ratios of soil organic matter (SOM) to locate and interpret areas of ancient C 4 plant growth and maize …
How Widowhood Shapes Adult Children's Responses to Mothers' Preferences for Care
Research has shown that mothers are at an increased risk for declining psychological well-being when caregiving preferences are not met. Findings from this study suggest that mothers who are divorced or have been widowed for several years may be at greater risk for violation of their caregiving preferences, increasing their vulnerability to declines in psychological well-being
Preventing and Reducing Alcohol and Other Drug Use among High-Risk Youths by Increasing Family Resilience
This study examines the effects of a community-based program designed to delay onset and reduce the frequency of alcohol and other drug (AOD) use among high-risk youths, ages 12 to 14, through strengthening family resilience. It is part of a larger five-year demonstration project funded by the Center for Substance Abuse Prevention (CSAP). The program was implemented in multiple church communities in rural, suburban, and inner-city settings. Progr…
Ancient soil resources of the Usumacinta River Region, Guatemala
Application of carbon isotope analysis to ancient maize agriculture in the Petexbatún region of Guatemala
The ancient Maya subsisted in an environment limited by shallow soils and unpredictable weather patterns until their collapse ∼A.D. 800–900. Ancient subsistence can be a difficult subject, with little physical evidence of agricultural artifacts and structures. This study characterized soil profiles and utilized changes in stable carbon isotope ratios of soil organic matter (SOM) to locate and interpret areas of ancient C 4 plant growth and maize …
Soil resources of the Motul de San José Maya
Investigations of soil resources in the department of Petén, Guatemala can provide important insight into the agricultural and land use strategies of the ancient Maya. The site of Motul de San José, located 3 km north of Guatemala's Lago Petén Itzá, is situated in the core zone of Classic Maya civilization and in an area currently inhabited by the modern Itzá Maya. This area was occupied and farmed from the Middle Preclassic period ( ̃600 B.C.) t…
Permafrost and organic layer interactions over a climate gradient in a discontinuous permafrost zone
Permafrost is tightly coupled to the organic soil layer, an interaction that mediates permafrost degradation in response to regional warming. We analyzed changes in permafrost occurrence and organic layer thickness (OLT) using more than 3000 soil pedons across a mean annual temperature (MAT) gradient. Cause and effect relationships between permafrost probability (PF), OLT, and other topographic factors were investigated using structural equation …
How Widowhood Shapes Adult Children's Responses to Mothers' Preferences for Care
Research has shown that mothers are at an increased risk for declining psychological well-being when caregiving preferences are not met. Findings from this study suggest that mothers who are divorced or have been widowed for several years may be at greater risk for violation of their caregiving preferences, increasing their vulnerability to declines in psychological well-being
Estimating aboveground live understory vegetation carbon in the United States
Despite the key role that understory vegetation plays in ecosystems and the terrestrial carbon cycle, it is often overlooked and has few quantitative measurements, especially at national scales. To understand the contribution of understory carbon to the United States (US) carbon budget, we developed an approach that relies on field measurements of understory vegetation cover and height on US Department of Agriculture Forest Service, Forest Invent…
Beyond MRV
Forests are important ecosystems that are under increasing pressure from human use and environmental change, and have a significant ability to remove carbon dioxide from the atmosphere, and are therefore the focus of policy efforts aimed at reducing deforestation and degradation as well as increasing afforestation and reforestation for climate mitigation. Critical to these efforts is the accurate monitoring, reporting and verification of current …
High-resolution mapping of aboveground biomass for forest carbon monitoring system in the Tri-State region of Maryland, Pennsylvania and Delaware, USA
Accurate estimation of forest aboveground biomass at high-resolution continues to remain a challenge and long-term goal for carbon monitoring and accounting systems. Here, we present an exhaustive evaluation and validation of a robust, replicable and scalable framework that maps forest aboveground biomass over large areas at fine-resolution by linking airborne lidar and field data with machine learning algorithms. We developed this framework over…
Ecology (6 obras) · Environmental Science (6 obras) · Geography (5 obras) · Biology (4 obras) · Soil water (4 obras) · Amazonian Archaeology and Ethnohistory (3 obras) · Archaeology (3 obras) · Archaeology and ancient environmental studies (3 obras) · Forest Management and Policy (3 obras) · Forestry (3 obras)