Study on soil water in rhizosphere and root system distribution of Nitraria tangutorum on Loess Plateau

Abstract

Abstract: The soil water in rhizosphere and root system distribution of Nitraria tangutorum was studied in hilly area in north part of Lanzhou City on Loess Plateau. The result indicated that the soil water content in rhizosphere incresed and then decreased as the soil depth. The variation of soil water content within 0 to 40 cm layer was higher and it was lower within 160 to 300 cm layer. The soil water content within 40 to 80 cm layer was the highest. The root length and diameter of root system were 100 cm and 300 cm respectively. The root length was 1.32 times of plant height. The diameter of root system was 3.23 times of plant crown. The aboveground biomass was 1.46 times of underground. The effective roots were mainly distributed within 0 to 40 cm layer, and the effective root weight within 0 to 20 cm and 20 to 40 cm layers accounted for 58.69% and 22.96% of the total respectively. And for the effective root length, they were 59.65% and 23.20% respectively. The amount of effective roots decreased significantly as the soil depth. The 0 to 40 cm layer was very important for the water utilization and the horizontal distribution range of roots was 3 times of that in vertical range. This pattern of root distribution helps the water absorbtion of plant which depend the natural rainfall as the only water source on Loess Plateau.

CLC Number:

Q948.12

WANG Wen, JIANG Wen-lan, XIE Zhong-kui, ZHANG De-gang, GONG Xu-yin, KOU Jiang-tao. Study on soil water in rhizosphere and root system distribution of Nitraria tangutorum on Loess Plateau[J]. Acta Prataculturae Sinica, 2013, 22(1): 20-28.

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