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| DOI：10.13522/j.cnki.ggps.2026001 |
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| Effects of subsurface drip-tape spacing on physiological traits and yield of winter wheat |
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Feng Pancen, Hu Xinlong, Zhao Shuanghui, Cheng Gaoshuai, Zhao Luying,
Sun Pu, Su Xinru, Mo Yan, Li Hao, Zhang Yanqun
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1. Department of Irrigation and Drainage, China Institute of Water Resources and Hydropower Research, Beijing 100048, China;
2. State Key Laboratory of Watershed Water Cycle and Water Safety, China Institute of Water Resources and Hydropower Research, Beijing 100048, China; 3. Tarim University School of Water Conservancy and Civil Engineering, Alaer 843300, China;
4. Agricultural College of Shanxi Agricultural University, Jinzhong 030801, China
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| Abstract: |
| 【Objective】Subsurface drip irrigation can reduce irrigation water use and improve water-use efficiency, but appropriate drip-tape spacing is critical for achieving these benefits. Here, we investigated the effects of subsurface drip-tape spacing on soil water distribution, photosynthesis, plant water status, SPAD value, and the yield of winter wheat.【Method】The field experiment was conducted using winter wheat cultivar Keyi 6259 as the test crop. There were two treatments: drip-tape spacing of 60 cm (D60) and 120 cm (D120), with the tapes buried at the depth of 30 cm. During the experiment, we measured soil water content, net photosynthetic rate [An], transpiration rate [Tr], stomatal conductance [gs], leaf water potential, SPAD value, and yield at different growth stages. Under D120, these were measured right above the drip tape (P1) and midway between two adjacent drip tapes (P2), while soil water content was measured at locations 30 cm (S1) and 60 cm (S2) horizontally away from the drip tape.【Result】①The vertical distribution of soil water content showed similar trends under D60 and D120, increasing first and then decreasing with increasing soil depth, before increasing again in deeper soil. ②At the flowering stage in 2024, D120 did not significantly affect An, Tr, or gs at P1, but significantly reduced Tr and gs at P2 by 33.15% and 30.71%, respectively, compared with D60. At the jointing and flowering stages in 2025, An, Tr, and gs followed the order D120-P1＞D60＞D120-P2; at the flowering stage, Tr and gs at D120-P1 were 17.96% and 19.67% higher, respectively, whereas An at D120-P2 was 11.19% lower than that under D60. ③In 2025, leaf water potential and SPAD value at the flowering stage showed the same spatial pattern (D120-P1＞D60＞D120-P2), and the physiological traits were positively correlated in both 2024 and 2025. ④D120 enhanced tillering, grains per spike, and thousand-grain weight at P1, which offset the yield reduction at P2, resulting in approximately same yield in D120 and D60.【Conclusion】Wide-spaced subsurface drip irrigation can maintain winter wheat yield, despite spatial variation in physiological performance, by enhancing photosynthetic capacity and yield components of plants located near the drip tapes, thereby compensating for the reduced photosynthetic performance of plants farther from the tapes. |
| Key words: drip tape spacing leaf water potential SPAD photosynthetic physiology yield |
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