نتایج جستجو برای: unmanaged compartment

تعداد نتایج: 31432  

Journal: :Remote Sensing 2016
Olena Dubovyk Tobias Landmann Andreas J. Dietz Gunter Menz

Currently there is a lack of quantitative information regarding the driving factors of vegetation dynamics in post-Soviet Central Asia. Insufficient knowledge also exists concerning vegetation variability across sub-humid to arid climatic gradients as well as vegetation response to different land uses, from natural rangelands to intensively irrigated croplands. In this study, we analyzed the en...

Journal: :Environmental entomology 2012
D M Lowenstein A S Huseth R L Groves

Cucumber (Cucumis sativus L.) is among the plants highly dependent on insect-mediated pollination, but little is known about its unmanaged pollinators. Both domestic and wild bee populations in central Wisconsin pickling cucumber fields were assessed using a combination of pan trapping and floral observations before and during bloom. Together with land cover analyses extending 2,000 m from fie...

2003
Xiaohui Liu

Previous literature studying analysts’ earnings forecasts examines their properties without considering firms’ response to analysts’ forecasts. This study improves upon previous research by considering firms’ earnings management with respect to analysts’ forecasts. I hypothesize that analysts understand firms’ earnings management practices, and incorporate firms’ expected behavior into their fo...

2011
Coeli M. Hoover

Forests play a key role in the global carbon cycle, and programs aimed at mitigating greenhouse gas emissions through the protection and enhancement of forest carbon stocks are growing in number. Adding greenhouse gas mitigation as a management objective presents managers with a considerable challenge, because data and guidelines are scarce. Long-term inventory datasets have the potential to se...

Journal: :Global change biology 2016
Peter V Caldwell Chelcy F Miniat Katherine J Elliott Wayne T Swank Steven T Brantley Stephanie H Laseter

Climate change and forest disturbances are threatening the ability of forested mountain watersheds to provide the clean, reliable, and abundant fresh water necessary to support aquatic ecosystems and a growing human population. Here, we used 76 years of water yield, climate, and field plot vegetation measurements in six unmanaged, reference watersheds in the southern Appalachian Mountains of No...

2014
Witoon Purahong Danuta Kapturska Marek J. Pecyna Elke Schulz Michael Schloter François Buscot Martin Hofrichter Dirk Krüger

Leaf litter decomposition is the key ecological process that determines the sustainability of managed forest ecosystems, however very few studies hitherto have investigated this process with respect to silvicultural management practices. The aims of the present study were to investigate the effects of forest management practices on leaf litter decomposition rates, nutrient dynamics (C, N, Mg, K...

1999
Robert J. Pabst Thomas A. Spies

We characterized the structure and composition of unmanaged riparian forests in three river basins in Oregon’s coastal mountains. Our objective was to evaluate stand attributes at three spatial scales: streamside (site), drainage network (stream order), and basin (subregion). Data on basal area, species composition, snag density, canopy cover, and tree regeneration were collected along transect...

2015
Tomasz Durak Roma Durak Ewa Węgrzyn Konrad Leniowski Brian J. Palik Eric J. Jokela

The Carpathians are Eastern Europe’s largest contiguous forest ecosystem and a hotspot of biodiversity. However, not much is known about changes in species diversity in these forests. Here we investigate the long-time changes in the diversity of plant communities in the Eastern Carpathian beech forests. We also inquire about the similarity of plant communities between managed and protected fore...

Journal: :Environmental entomology 2009
David W Allgood Darren A Miller Matina C Kalcounis-Rueppell

Intensive pine (Pinus spp.) management is a primary land use in the southeastern United States. In eastern North Carolina, intensively managed pine stands often occur on land previously ditched and drained. Because modification of natural vegetation and water sources are known to affect dipteran community structure, we studied effects of intensive pine management on abundance and diversity of d...

2011
Don C. Bragg Michael G. Shelton

The Crossett Experimental Forest was established in 1934 to provide landowners in the UpperWest Gulf Coastal Plain with reliable, science-based advice on how to manage their loblolly (Pinus taeda) and shortleaf (Pinus echinata) pine-dominated forests. A key component of this program was the establishment of an unmanaged control, currently known as the Russell R. Reynolds Research Natural Area (...

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