Land use and land cover in critical source areas on small dairy farms in the eastern United States

2015 ◽  
Vol 70 (4) ◽  
pp. 257-266 ◽  
Author(s):  
N. R. Jordan ◽  
K. M. Clower ◽  
S. M. Manson ◽  
D. B. Bonsal ◽  
J. L. Immich
Keyword(s):  
United States ◽  
Land Use ◽  
Land Cover ◽  
Dairy Farms ◽  
Eastern United States ◽  
Critical Source Areas ◽  
Source Areas

scholarly journals Impacts of Land-Use/Land-Cover Change on Afternoon Precipitation over North America

2017 ◽  
Vol 30 (6) ◽  
pp. 2121-2140 ◽  
Author(s):  
Liang Chen ◽  
Paul A. Dirmeyer
Keyword(s):  
United States ◽  
Land Use ◽  
North America ◽  
Land Cover ◽  
Land Cover Change ◽  
Great Plains ◽  
East Coast ◽  
Convective Precipitation ◽  
Eastern United States ◽  
The U.S

Abstract This study investigates the impacts of historical land-cover change on summer afternoon precipitation over North America using the Community Earth System Model. Using land–atmosphere coupling metrics, this study examines the sensitivity of afternoon atmospheric conditions to morning land surface states and fluxes that are altered by land-cover changes before and since 1850. The deforestation in the eastern United States prior to 1850 leads to increased latent but decreased sensible heat flux during the morning and a reduction in afternoon precipitation over the southern regions of the U.S. East Coast. The agricultural expansion over the Great Plains since preindustrial times shows similar effects on surface fluxes but results in a significant widespread increase in precipitation over the crop area. The coupling metrics exhibit a strong positive soil moisture–precipitation relationship over the Great Plains. Impacts of land-cover change on precipitation manifest through changes in rainfall frequency, rather than intensity, that are largely controlled by the distribution of CAPE as the trigger of convective precipitation. However, deforestation and later reforestation over the eastern United States, where coupling properties are different than the Great Plains, do not have as dominant an effect on afternoon precipitation. Additionally, precipitation over parts of the U.S. Southwest decreases in this model during the earlier period of East Coast deforestation, owing to changes in the large-scale circulation over North America driven by land-use changes prior to 1850.

Spatial features of land use/land cover change in the United States

2003 ◽  
Vol 13 (1) ◽  
pp. 63-70 ◽  
Author(s):  
Zhiqiang Gao ◽  
Jiyuan Liu ◽  
Xiangzheng Deng
Keyword(s):  
United States ◽  
Land Use ◽  
Land Cover ◽  
Land Cover Change ◽  
The United States ◽  
Land Use Land Cover ◽  
Spatial Features

Identification of critical source areas under present and projected land use for effective management of diffuse pollutants in an urbanized watershed

2018 ◽  
Vol 17 (2) ◽  
pp. 171-184 ◽  
Author(s):  
Al-amin Danladi Bello ◽  
Mohd Ridza Mohd Haniffah ◽  
Muhammad Nassir Hanapi ◽  
Aliyu Bamaiyi Usman
Keyword(s):  
Land Use ◽  
Effective Management ◽  
Critical Source Areas ◽  
Source Areas

Advances in Understanding Landscape Influences on Freshwater Habitats and Biological Assemblages

2019 ◽  
Keyword(s):  
United States ◽  
Land Use ◽  
Land Cover ◽  
Biological Properties ◽  
Western United States ◽  
Stream Ecosystems ◽  
Human Land Use ◽  
Natural Land ◽  
Stream Biota ◽  
Land Use And Cover

<i>Abstract.</i>—Surrounding land use and cover can have profound effects on the physical, chemical, and biological properties of stream ecosystems. For this reason, changes in land use and cover throughout catchments often have strong effects on stream ecosystems that are particularly interesting to researchers. Additionally, natural physical and climatic, or physiographic, characteristics are important for determining natural land cover and constraining human land use and are also strongly related to stream habitat and biota. Because the physiographic template differs among catchments and is an important mediator of catchment processes, it is important to account for natural physiographic differences among catchments to understand the relationship between land use/cover and stream biota. In this paper, we develop and assess the usefulness of a regional framework, land use/cover distinguished physiographic regions (LDPRs), which is designed for understanding relationships between land use/cover and stream biota while accounting for the physiographic template. We classified hydrologic units into LDPRs based on physiographic predictors of land use and cover for the eastern and western United States through the use of multivariate regression tree analysis. Next, we used case study data to assess the usefulness of LDPRs by determining if the relationships between fish assemblage function and land use/cover varied among classes using hierarchical logistic regression models. Eight physiographic characteristics determined land cover patterns for both the eastern and western United States and were used to classify hydrologic units into LDPR classes. Five commonly used biotic metrics describing trophic, reproductive, and taxonomic groupings of fish species responded in varying ways to agriculture and urban land use across LDPRs in the upper Mississippi River basin. Our findings suggest that physiographic differences among hydrologic units result in different pathways by which land use and cover affects stream fish assemblages and that LDPRs are useful for stratifying hydrologic units to investigate those different processes. Unlike other commonly used regional frameworks, the rationale and methods used to develop LDPRs properly account for the often-confounded relationship between physiography and land use/cover when relating land cover to stream biota. Therefore, we recommend the use and refinement of LDPRs or similarly developed regional frameworks so that the varying processes by which human land use results in stream degradation can be better understood.

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