نتایج جستجو برای: biomass productivity index

تعداد نتایج: 532745  

In order to investigate the effects of sowing date (SD) and single irrigation (SI) amounts on yield and yield components of rainfed wheat varieties, a field experiment was conducted as split-split plots arranged in a randomized complete blocks design with three replications during 2002-2004 at main station of Dryland Agricultural Research Institute in Maragheh, Iran. Treatments included three s...

2016
Li Bin Liu Hua Mei Yang Yue Xu Yin Ming Guo Jian Ni Mark E. Harmon

Biomass and net primary productivity (NPP) are important factors for studying terrestrial carbon storage and the carbon cycle. Using data from existing literature, this study synthesized and analyzed a comprehensive database of direct field observations of forest biomass and NPP for Southwestern China. The biomass of mature natural forests and mature planted forests range from 81.2 Mg ̈ha ́1 to 6...

2007
AMY D. ROSEMOND

This study was conducted to characterize periphyton biomass, productivity, and algal species composition, and to examine how these parameters changed seasonally over the course of two years in Walker Branch, a temperate forest stream. Seasonal variations in several factors potentially controlling periphyton (irradiance, streamwater nutrient concentrations, temperature, and the incidence of seve...

Journal: :Remote Sensing 2016
Donald C. Wehlage John A. Gamon Donnette R. Thayer David V. Hildebrand

Remote sensing is often used to assess rangeland condition and biophysical parameters across large areas. In particular, the relationship between the Normalized Difference Vegetation Index (NDVI) and above-ground biomass can be used to assess rangeland primary productivity (seasonal carbon gain or above-ground biomass “yield”). We evaluated the NDVI–yield relationship for a southern Alberta pra...

Journal: :Genetics 1983
D S Haymer D L Hartl

Twelve diverse strains of Drosophila melanogaster have been examined with respect to their individual fitness components and with respect to their relative performance under competitive and noncompetitive conditions. Individual fitness components included estimates of time until successful copulation (t), fecundity (f) and egg-to-adult viability (v), and a composite index of overall fitness of ...

2010
Tara E. Sackett Nathan J. Sanders T. E. Sackett

Soil fauna can be an important regulator of community parameters and ecosystem processes, but there have been few quantitative syntheses of the role of soil fauna in terrestrial soil communities and ecosystems. Here, we conducted a metaanalysis to investigate the impacts of invertebrate soil microand mesofauna (grazers and predators) on plant productivity and microbial biomass. Overall our resu...

2015
Max A. Henschell Christopher R. Webster David J. Flaspohler Chad R. Fortin Eric Gordon Lamb

United States energy policy mandates increased use of renewable fuels. Restoring grasslands could contribute to a portion of this requirement through biomass harvest for bioenergy use. We investigated which plant community characteristics are associated with differences in biomass yield from a range of realistic native prairie plantings (n = 11; i.e., conservation planting, restoration, and wil...

2013
Woongsoon Jang Christopher. R. Keyes Thomas E. Perry

Recent rising public concerns about climate change and increasing energy costs have led to the need to re-evaluate forest biomass as an alternative energy feedstock. Biomass harvesting could potentially impact ecosystems in various ways, including site productivity and forest stand dynamics. Since these issues influence decision-making, the effects of biomass utilization are primary issues not ...

2010
Kaibo WANG Ruixin SHAO Zhouping SHANGGUAN Kaibo Wang

We investigated changes in species richness, community biomass, and productivity during secondary forest succession in Ziwuling area of the Loess Plateau of China. Species richness(number of taxa) increased as the succession proceeds, and peaked at the climax forest community, but the richness growth gradually slowed down as the succession advanced. Community biomass rapidly increased from the ...

Journal: :Remote Sensing 2016
Ran Wang John A. Gamon Rebecca A. Montgomery Philip A. Townsend Arthur I. Zygielbaum Keren Bitan David Tilman Jeannine Cavender-Bares

Species richness generally promotes ecosystem productivity, although the shape of the relationship varies and remains the subject of debate. One reason for this uncertainty lies in the multitude of methodological approaches to sampling biodiversity and productivity, some of which can be subjective. Remote sensing offers new, objective ways of assessing productivity and biodiversity. In this stu...

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