Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"minirhizotron"”.
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Measuring Root Growth Response to Nitrogen Fertilization Rates in Young Pecan Seedlings Using the Minirhizotron Method
… applications for maximum N absorption. The minirhizotron method was used to observe root growth through time at two soil depths, 14-28 cm and 98-112 cm, from February 2010 to June 2012. Images were collected every two weeks, roots were traced individually, and date of birth and death, …
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Development of a Low-Cost System for Monitoring Root Growth Dynamics
… study because of their below-ground structure. Minirhizotrons – root imaging tools that use transparent tubes installed in the soil to allow for the non-destructive, in situ observation of plant roots – offer a non-invasive solution for capturing root images over time. However, existing products …
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Effects of Elevated Atmospheric CO2 on Root Growth, Turnover and Decomposition in a Scrub Oak Ecosystem
… ecosystem at Kennedy Space Center, Florida. Minirhizotron tubes were installed in each elevated and control chamber to allow observation of roots. Each tube was sampled for root length density (mm cm<sup>−2</sup>) every three months. Carbon dioxide enrichment of the chambers began May 15, …
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Fine Root Dynamics in a Pinus palustris Mill. Ecosystem: The Role of Sampling Interval and the Soil Environment
… estimates by comparing data from a weekly minirhizotron sampling regimen to subsets of the same data representing biweekly, monthly, bimonthly, and quarterly sampling regimens. We also investigated possible sources of error involved in the root tracing technique and estimated root herbivory …
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Fine root dynamics in the Boreal Forest of northern Saskatchewan, Canada
… during a four year period, 2) to determine if minirhizotron (MR) estimates of root biomass were similar to root coring estimates, 3) to determine how root production, mortality, turnover, and longevity vary with root diameter class and soil depth, and 4) to determine if image collection …
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Automated Root Tracing Using Deep Learning
… However, tracing roots from photos obtained with Minirhizotron is a time-consuming task, and applying deep learning techniques can facilitate this process. This thesis applies the DeepLabV3+ model with a confidence weighted approach to segment root structures in soil images. The methodology …
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Effects of Elevated Atmospheric CO2 on Root Dynamics, Biomass and Architecture in a Scrub-Oak Ecosystem at Kennedy Space Center, Florida
… including ground-penetrating radar (GPR) and minirhizotron observation tubes, were used to investigate effects of elevated CO<sub>2</sub> on root biomass, dynamics (productivity, mortality, and turnover), root persistence and architecture in a fire dominated scrub-oak ecosystem. Open-top …
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Plant root contributions to the carbon balance of a changing agricultural Midwest
… several potential biofuel crops, I collected minirhizotron images from 0-100 cm depth over five growing seasons from a maize-maize-soybean row crop rotation and from three perennial grasses. I developed a Bayesian statistical model that accounts for near-surface underdetection effects and …
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Root Dynamics, Management Effects and Carbon Sequestration on Invaded and Native Semi-Arid Grasslands
… root production and mortality. The use of minirhizotrons facilitates belowground research, but sample intervals are controversial since long intervals miss roots that grow and die between the samples. Also, root responses to grassland management such as mowing are less well-known than shoot …
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Non-invasive monitoring of water and solute fluxes in a cropped soil
… increasing number of roots with depth. Since the minirhizotron measurements were only conducted at four depths and thus represent a small volume of the entire root zone, we estimated a root architecture model for the barley plants using RootTyp. We were able to set up a simple model, but to obtain …
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Rehabilitation of Severely Compacted Urban Soil to Improve Tree Establishment and Growth
Land development restricts tree growth by damaging soil structure and removing organic matter. Mechanical loosening and organic amendment may improve soil physical properties and tree establishment and growth. Effects of typical post-construction practice and improved methods of soil restoration on …