Determination of root diffusivity during water flow in root-soil systems

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Title: Determination of root diffusivity during water flow in root-soil systems
Author: Bian, An-Gwo
Abstract: We are concerned with determining plant (cotton ) root hydraulic diffusivity by measurement of the water flow from the region between two horizontal cross sections into the soil from root xylem through root epidermis over a period of time . The results of the experiment conducted by Yamauchi et al . [30] to measure the potential gradient in the root xylem of an intact , transpiring cotton plant are utilized to estimate the hydraulic difFusivity of the combined root tissues between root xylem and root epidermis . Figure 1 .1 shows the cross -section of a root . Figure 1 .2 is a schematic illustration of the laboratory setup used by Yamauchi et al . to collect water and measure the gradient in xylem water potential and water flow rate . The measurements were made in rigidly controlled environments . Temperature , soil moisture level , and lighting condition were all under control . The water potential of the xylem at a particular point along a root was measured while the plant was actively transpiring ; the plant was still alive . There was no destruction of the root . This technique also allowed the xylem water potential at a particular point to be monitored dynamically . The water was collected by enclosing a small length of root in specially constructed Teflon psychrometer chambers . For a more detailed experimental description , refer to [30] .
URI: http : / /hdl .handle .net /2346 /20770
Date: 1995-05

Citation

Determination of root diffusivity during water flow in root-soil systems. Doctoral dissertation, Texas Tech University. Available electronically from http : / /hdl .handle .net /2346 /20770 .

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