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| DOI：10.13522/j.cnki.ggps.20170053 |
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| Effects of Reclaimed Water Irrigation and Soil Types on Water Consumption and Growth of Trees |
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SUN Hongxing, ZHAO Quanyong, WANG Yong
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1.College of Geographical Science, Inner Mongolia Normal University, Hohhot 011517, China;2.Inner Mongolia for Water-saving Agricultural Engineering Research Center, Hohhot 011517, China
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| Abstract: |
| 【Objective】Water quality affects physical and biochemical processes in soil and thereby water consumption of plantations. The purpose of this paper is to study the uptake of water by trees in different soils irrigated with reclaimed wastewater taken from a fermentation plant.【Method】The experiments were conducted in plots and we investigated five tree species: Picea asperata, Pinus sylvestris, Platycladus orientalis, Ligustrum quihoui and Ulmuspumila pumila planted in two soil types-sandy loam and silt loam soil. The water consumption of each tree during its growth period was investigated under irrigation with clean water (control) and reclaimed wastewater.【Result】 Irrigation with reclaimed wastewater did not alert the water consumption and the mean crop coefficient Kc for soils, but changed the stage of the highest water consumption of Ligustrum quihoui and the stage where Kc peaked for Picea asperata and Ulmuspumila pumila. The cumulative water consumption and the Kc value of all species but Pinus sylvestris were lower when growing in the silt loam soil than in the sandy loam, regardless of the irrigation water. The cumulative water consumption of Picea asperata, Pinus sylvestris, Ligustrum quihoui and Ulmuspumila pumila decreased by 13.85%, 15.23%, 23.27% and 8.07%, respectively, under clean water irrigation, yet decreased by 17.00%, 12.13%, 22.48% and 11.98% under reclaimed water irrigation, respectively. The Kc decreased by 13.51%, 15.52%, 23.42% and 10.21% under clean water irrigation and 17.86%, 14.54%, 20.55% and 14.98% under reclaimed water irrigation, respectively. Irrigation with reclaimed wastewater changed significantly the growth of all species except Ulmuspumila pumila, and marginally changed the growth of the canopy of Pinus sylvestris and Ulmuspumila pumila in both soils.【Conclusion】 Picea asperata and Platycladus orientalis under clean water irrigation are suitable to be planted in silt loam, while Ligustrum quihoui and Ulmuspumila pumila under reclaimed water irrigation are suitable for platting in the sandy loam. |
| Key words: reclaimed water; sandy loam; silt loam; tree species; water consumption; growth |
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