Effects of water and fertilizer coupling on photosynthetic and chlorophyll contents of jujube under drip irrigation in south Xinjiang sandy area
HOU Yusheng1,2, WANG Zhenhua1,2*, LI Wenhao1,2, BIAN Qingyong1,2, LI Chaoyang1,2
1.College of Water Resources and Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China; 2.Key Laboratory of Modern Water-saving Irrigation, Xinjiang Production and Construction Group, Shihezi, Xinjiang 832000, China
Abstract：In order to explore effects of water and fertilizer coupling on photosynthetic characteristics and chlorophyll relative contents of jujube in southern Xinjiang sandy area, the 8-year mature magnificent jujube trees were used as test plant, and water and nitrogen two-factor, three-level Latin square experiments were conducted in a small-sized land under drip-irrigation conditions. The results show that the diurnal variation of net photosynthetic rate(Pn)and stomatal conductance(Gs)of jujube presents two peaks, but the diurnal variation of transpiration rate(Tr)has a single peak. For case W2F1, the variation profiles of intercellular CO2 concentration(Ci)and leaf water use efficiency(WUE)present a single peak as well, and the maximums of Pn, Tr and Gs increase by 34.8%, 10.74% and 7.14%, respectively, compared with those under ordinary flooding irrigation(CK). For case W2F3, the peak values of Ci and WUE increase by 29.04% and 8.33%, respectively, compared with CK. Note that both chlorophyll relative content and nitrogen content are in the maximum in W3F3 treatment, especially 6.00% and 9.49% higher than in CK, respectively. Unfortunately, W3F3 shows no significant difference from W2F1(P>0.05). Pn is closely related to Tr and Gs, but Pn is just slightly related to chlorophyll relative content and nitrogen content. There is a close correlation between chlorophyll relative content and nitrogen content but a low correlation with WUE. According to the experimental results, a preliminary conclusion can be reached that irrigation 820 mm and fertilizer 450 kg/hm2(W2F1)are the best water-fertilizer supply mode for water and fertilizer saving in southern Xinjiang sandy area.
侯裕生,, 王振华,*, 李文昊,, 扁青永,, 李朝阳,. 水肥耦合对南疆沙区滴灌红枣光合特性及叶绿素相对含量的影响[J]. 排灌机械工程学报, 2018, 36(9): 914-919.
HOU Yusheng,, WANG Zhenhua,*, LI Wenhao,, BIAN Qingyong,, LI Chaoyang,. Effects of water and fertilizer coupling on photosynthetic and chlorophyll contents of jujube under drip irrigation in south Xinjiang sandy area. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(9): 914-919.
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