Simulation study on effects of root length distribution and soil texture on crop transpiration

doi:10.3969/j.issn.1004-1524.2018.08.16

›› 2018, Vol. 30 ›› Issue (8): 1382-1388.DOI: 10.3969/j.issn.1004-1524.2018.08.16

• Environmental Science • Previous Articles Next Articles

Simulation study on effects of root length distribution and soil texture on crop transpiration

TAN Min¹, YU Yongfu¹, HU Zhengfeng², ZHANG Kefeng^3,*

1. College of Civil Engineering and Architecture,Zhejiang University, Hangzhou 310058,China;
2. Design and Research Institute of Environmental Protection Sciences of Zhejiang Province,Hangzhou 310007,China;
3. Ningbo Institute of Technology,Zhejiang University,Ningbo 315100,China

Received:2017-11-06 Online:2018-08-25 Published:2018-08-28

Abstract

Abstract: Root water uptake is a key process in the water dynamics of the soil-crop system, and the root length distribution has a great impact on water uptake. In this study, a numerical investigation was carried out into the effects of root distributions in clay loam and sandy loam soils on soil water content distribution and root water uptake under two potential transpiration rates. It was shown that for a given rooting depth of 30 cm, the variation of soil water content in the root zone was significant during the process of transpiration, and the contribution of soil water below the 40 cm depth was ignorable to transpiration. A uniform distribution of root length was helpful for water uptake during the early phrase of transpiration, but encountered difficulty at later stages. The variation pace of soil water content was faster in the sandy loam soil than that in the clay loam soil, and it was easier for roots in the sandy loam soil to capture water in the vicinity of the root zone area.

Key words: transpiration, soil water content, root water uptake, root length distribution, agricultural water management

CLC Number:

S152.7

TAN Min, YU Yongfu, HU Zhengfeng, ZHANG Kefeng. Simulation study on effects of root length distribution and soil texture on crop transpiration[J]. , 2018, 30(8): 1382-1388.

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Simulation study on effects of root length distribution and soil texture on crop transpiration

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