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Journal of Arid Land
Journal of Arid Land
Research Articles     
Effects of soil moisture on cotton root length density and yield under drip irrigation with plastic mulch in Aksu Oasis farmland
ChengYi ZHAO, YingYu YAN, Yilihamu Yimamu, JuYan LI, ZhiMin ZHAO, LaoSheng WU
1 Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; 2 General Station of Water and Soil Conversation and Eco-environmental Monitoring of Xinjiang, Urumqi 830000, China; 3 Graduate University of Chinese Academy of Sciences, Beijing 100039, China; 4 Department of Soil and Environmental Sciences, University of California, Riverside, CA 92521, USA
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Abstract  Effects of soil moisture on cotton root length density (total root length per unit soil volume) and yield under drip irrigation with plastic mulch were studied through field experiments. The results indicate that spatial distributions of root length density of cotton under various water treatments were basically similar. Horizontally, both root length densities of cotton in wide and narrow rows were similar, and higher than that between mulches. Vertically, root length density of cotton decreased with increasing soil depth. The distribution of root length density is different under different irrigation treatments. In conditions of over-irrigation, the root length density of cotton between mulches would increase. However, it would decrease in both the wide rows and narrow rows. The mean root length density of cotton increased with increasing irrigation water. Water stress caused the root length density to increase in lower soil layers. There is a significant correlation between root length density and yields of cotton at the flower-boll and wadding stages. The regression between irrigation amount and yield of cotton can be expressed as y = -0.0026x2+18.015x-24845 (R2 = 0.959). It showed that the irrigation volume of 3,464.4?m3/hm2 led to optimal root length density. The yield of cotton was 6,360?.8?kg/hm2 under that amount of irrigation.

Key words： hydraulic architecture      leaf water potential      transpiration      hydraulic resistance      stomatal conductance      hydraulic limitation     
Received: 03 August 2010      Published: 07 December 2010
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ChengYi ZHAO
YingYu YAN
Yilihamu Yimamu
JuYan LI
ZhiMin ZHAO
LaoSheng WU
Cite this article:

ChengYi ZHAO, YingYu YAN, Yilihamu Yimamu, JuYan LI, ZhiMin ZHAO, LaoSheng WU. Effects of soil moisture on cotton root length density and yield under drip irrigation with plastic mulch in Aksu Oasis farmland. Journal of Arid Land, 2010, 2(4): 243-249.

URL:

http://jal.xjegi.com/10.3724/SP.J.1227.2010.00243     OR     http://jal.xjegi.com/Y2010/V2/I4/243

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