搜索结果: 1-15 共查到“农学 year”相关记录91条 . 查询时间(0.109 秒)
Influence of stand thinning and repeated fertilization on plant community abundance and diversity in young lodgepole pine stands: 15-year results
Biodiversity British Columbia Fertilization Forest management Lodgepole pine Plant productivity
2024/1/19
Enhanced forest productivity may provide the supply of wood fiber to keep pace with increasing global demand for wood products and the growing constraints on the harvestable land base imposed by measu...
Structural Features of a Post-Clear-Cutting Ecotone between 90-Year-Old Bilberry Spruce Forest and 35-Year-Old Herbs-Forbs Deciduous Stand
ecotone complex bilberry-type spruce forest deciduous stand clear-cut edge effect ground vegetation epiphytes tree fine root biomass
2023/12/1
In a natural regeneration process, a community dominated by birch and aspen forms in the site 35 years after a bilberry-type spruce stand is logged down. The newly formed ecotone complex consists of f...
Lightning strikes more than 100 million times per year in the tropics（图）
Lightning strikes 100 million times per year tropics
2020/7/31
Scientists at the Smithsonian Tropical Research Institute in Panama have published dramatic maps showing the locations of lightning strikes across the tropics.Based on ground and satellite d...
Tree Communities in Three-Year-Old Post-Mining Sites Under Different Forest Restoration Techniques in the Brazilian Amazon
dispersal importance value index pollination seed sources
2024/2/4
Forest loss and degradation in the Brazilian Amazon due to mining activities has been intense for many years. To reverse this situation, a range of restoration programs for deforested and degraded are...
Striking 20-year grasshopper declines tied to quality of prairie grasses（图）
20-year grasshopper declines tied quality prairie grasses
2020/3/13
A new study shows that grasshopper numbers have declined more than 30% in a Kansas grassland preserve over the past two decades. The results were published in the journal Proceedings of the Natio...
Effects of One-Year Simulated Nitrogen and Acid Deposition on Soil Respiration in a Subtropical Plantation in China
nitrogen deposition acid deposition soil respiration subtropical forest
2024/2/5
Atmospheric nitrogen (N) and acid deposition have become global environmental issues and are likely to alter soil respiration (Rs); the largest CO2 source is from soil to the atmosphere. However, to d...
SPATIO-TEMPORAL ASSESSMENT OF MARGALLA HILLS FOREST BY USING LANDSAT IMAGERY FOR YEAR 2000 AND 2018
Change Detection LULC Supervised Classification Satellite Remote Sensing LANDSAT ETM+ and OLI
2018/5/11
Environmental imbalance due to human activities has shown serious threat to ecosystem and produced negative impacts. The main goal of this study is to identify, monitor and classify temporal changes o...
Carbon Feedback from Forest Soils will Accelerate Global Warming,26-Year Study Projects
Carbon Feedback Forest Soils Accelerate Global Warming 26-Year Study Projects
2017/10/25
After 26 years, the world’s longest-running experiment to discover how warming temperatures affect forest soils has revealed a surprising, cyclical response: Soil warming stimulates periods of abundan...
In a drought,over-irrigated lawns lose 70 billion gallons of water a year
In a drought over-irrigated lawns lose 70 billion gallons water a year
2017/7/20
In the summer of 2010, Los Angeles lost about 100 gallons of water per person per day to the atmosphere through evaporation, mostly from overwatering of lawns and trees.Lawns accounted for 70 percent ...
L.A. lawns lose lots of water:70 billion gallons a year
L.A. lawns lose lots of water 70 billion gallons a year
2017/7/20
In summer 2010, Los Angeles was losing about 100 gallons of water per person per day to the atmosphere through the evaporation and plant uptake of lawns and trees. Lawns accounted for 70 percent of th...
Changes in the nutrition and health status of young Norway spruce stands in the Krkonoše Mts. in a 17-year period
mountain forest height increment defoliation nutrients stress elements nutrient ratio
2018/3/6
For 17 Norway spruce stands located in the Krkonoše Mts. in the Czech Republic a long-term assessment of defoliation,
height increment, foliage concentration of nutrients (N, P, Ca, K, Mg) and s...
Transport losses in finisher pigs: impact of transport distance and season of the year
Mortality Swine Transportation Ambient Temperature Welfare
2017/3/8
The death of animals during transport for slaughter is a major factor indicating the level of welfare in transported animals. The aim of this study was to assess mortality related to the commercial tr...
Trapping of internal and external feeding stored grain beetle pests with two types of pitfall traps: a two-year field study
Coleoptera stored-product pests grain
2016/2/22
Pitfall trapping studies are available for particular stored grain pest species. In small farms, the stored grain pest control strategy is rarely species-specific but is often “pest ecological-group-s...
Fine root development and mycorrhization in Norway spruce stands one year after fertilization with potassium sulphate and wood ash
forest fertilization fine root ectomycorrhizal fungi
2016/1/29
We compared the effects of forest fertilization with wood ash and potassium (K) sulphate on growth and mycorrhizal colonization of fine roots and on other soil microorganisms in Norway spruce (Picea a...
Analysis of alternative models treating herd ?year effects as fixed or random
predictive ability BLUP station test
2015/6/1
The analysis was conducted of the national database of station tests carried out between May 1996?February 2001, using the Hungarian Large White breed. Days of test, total amount of consumed feed and ...