Effects of moistube irrigation on growth and moisture-radiation use of coffea arabica under jujube shading cultivation
ZHU Yifei1, LIU Xiaogang1*, HE Hongyan2, YANG Qiliang1, SUI Long1
1.Faculty of Modern Agricultural Engineering, Kunming University of Science and Technolog, Kunming, Yunnan 650500, China; 2.Tropical and Subtropical Economic Crops Institute, Yunnan Academy of Agricultural Sciences, Baoshan, Yunnan 678025, China
In order to find out the moisture-radiation coupling mode for young coffee tree, effects of water head of moistube irrigation on soil moisture distribution in the root zone, growth and photosynthetic characteristics of coffea arabica were studied under jujube shading cultivation by pot experiment. A design of experiment was completed by involving two factors and three levels, i.e. three water heads such as low(H1.0:1.0 m), moderate(H1.5:1.5 m)and high water head(H2.0:2.0 m), three jujube shade degrees, namely no shading(S0:100% natural light), moderate shading(S1:65%-75% natural light), and severe shading(S2:45%-55% natural light). The results show that the water head and shading degree have a significant effect on the mean soil moisture in the root zone of coffea arabica. The wetted zone size increases with increasing water head, and decreases slightly with increasing shading degree. The mean and uniformity of soil moisture in the wetted zone increases significantly with water head, but decreases slightly with shading degree. Compared with S0, height, stem diameter, crown width and number of leaves in S1 are increased by 20.31, 12.44, 24.45 and 52%, respectively. Compared with H1.0, the average net photosynthetic rate(Pn), transpiration rate(Tr), apparent light use efficiency(ALUE)and instantaneous water use efficiency(IWUE)of leaves are increased by 22.10%-60.75%, 28.02%-70.49%, 35.51%-81.65% and 26.42%-39.61% in H1.5 and H2.0, respectively, while the intercellular carbon dioxide concentration(CO2)is decreased by 14.16%-31.32%. Compared with S0, an increasing shading degree results in 12.20%-26.10% and 5.37%-26.28% increments in Pn and Tr, but 5.88%-11.97% reduction in intercellular CO2. In S1, ALUE and IWUE are increased by 15.02% and 15.53% in S2, however, decrease by 5.88% and 11.97%. In H2.0S1, the tree growth, Pn, IWUE and ALUE of leaves have been enhanced significantly. This treatment should be is a suitable cultivation mode to coffea Arabica young tree under coupled moistube irrigation and jujube shading conditions.
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