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Juniper species are noted for long-lived foliage, low and persistent gas exchange activity and drought tolerance. Because leaves and roots of the same species are thought to be similar in structure and life history, we hypothesized that Juniperus osteosperma (Torr.) Little (Utah juniper) fine roots would reflect the persistent aboveground foliage characteristic of this species. We monitored fine roots, less than 1 mm in diameter, by minirhizotron imaging to a depth of 150 cm over two growing seasons from April 2002 to December 2003. We measured fine root numbers, lengths and diameters, and noted the time of birth and death of root segments. We correlated our root data with soil water potential measured by thermocouple...
Image analyses systems provide a quick determination of various root morphological parameters. Generally, a specific testing procedure should be conducted at the beginning of every measurement process. In this study, the performance of two image analyses programs using different measuring algorithms was compared: a commercial package WinRHIZO and a freeware ROOTEDGE. Roots of field grown cereal crops, wheat (Triticum durumDesf.) and barley (Hordeum vulgare L.), were used. Several types of tests were executed: 1. Comparison of image analyses and manually conducted measurements of root length; 2. Comparison between root length, average diameter and surface area measurements performed with ROOTEDGE and WinRHIZO; 3....


    map background search result map search result map Root turnover and relocation in the soil profile in response to seasonal soil water variation in a natural stand of Utah juniper (Juniperus osteosperma).