| The method of measuring root system hydraulic conductance of seedling crops of maize and wheat |
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| DOI：10.7606/j.issn.1000-7601.2008.03.23 |
| Key Words: root hydraulic conductance ascending pressure method descending pressure method maize wheat |
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| Abstract: |
| Root system hydraulic conductance of seedling crops of maize and wheat were measured through pressure chamber and the ascending and descending measurements were compared．The result of root system hydraulic conductance of seedling crops of maize showed：water flux （ Jv） in the root system linearly increased with steady increases in imposed pressure．When imposed pressure （△P） was below 0．8 MPa Jv measured by notable higher than ascending measurements；when △P was at 0．8 to 1．2 MPa the measuring results were almost equal．This means that there was a critical point between Jv measured by descending and ascending measurements with △P changing．Compared with the process of descending then ascending pressure and ascending then descending pressure Jv in later process was always bigger than former process．This indicated that pressure inducement maybe changed the form of water conductance．In the pressure range of 0～2．0 MPa Jv appeared a flat in measurement of descending pressure with maize water cultivation and wheat soil cultivation which indicated that special conducing mechanism existed in the process of water conduced． |