Pedosphere 7(2): 133--140, 1997
ISSN 1002-0160/CN 32-1315/P
©1997 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Behaviours of soil-root interface and their variations with wheat varieties |
| HUANG Ming-Bin1, KANG Shao-Zhong1,2, ZHANG Fu-Cang2 and LI Yu-Shan1 |
1 State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Academia Sinica and Mnistry of Water Resoumes, Shaanxi, Yangling 712100 (China);
2 Northwestern Agricuftural University, Shaanxi, Yangling 712100 (China) |
| ABSTRACT |
| Water movement into and out of roots depends on the water potential difference between the bulk soil and the root xylem and the total hydraulic conductance of the pathway, which can be divided into three parts, i.e. soil conductance, soil-root conductance and root conductance. The values and relative importance vary with soil water content. The general rule is that water uptake by roots is mainly limited by radial hydraulic conductance of roots in wet soils, the soil-root interface becomes a major limiting factor to water uptake in moderately dry soils, and the water uptake is limited by the rapidly decreasing soil hydraulic conductance in seriously dry soils. Meanwhile these limiting factors vary with crop variety, and these variations can be used to evaluate the drought-resistance and water use efficiency of crops. |
| Key Words: crop variety, hydraulic resistance, soil-root interface |
| Citation: Huang, M. B., Kang, S. Z., Zhang, F. C. and Li, Y. S. 1997. Behaviours of soil-root interface and their variations with wheat varieties. Pedosphere. 7(2): 133-140. |
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