PDF
Full
Outline
To investigate the effects of different water and nitrogen treatments on photosynthetic characteristics, yield and water-nitrogen use efficiency of drip-irrigated winter wheat during the grain-filling stage, a field experiment was conducted using the cultivar Yinong 22. Three drip irrigation levels 5 250 (W1), 6 000 (W2) and 6 750 (W3) m3·hm-2and three nitrogen application rates 0 (N0), 240 (N1) and 300 (N2) kg·hm-2were established to analyze the impacts of water-nitrogen combinations on chlorophyll relative content (SPAD), photosynthetic parameters, leaf area index (LAI), dry matter accumulation, yield and water-nitrogen use efficiency, and the response of each factor to yield was revealed by path analysis. The results showed that irrigation amount and nitrogen application rate significantly affected SPAD, LAI, photosynthetic parameters (Ci, Gs, Pn and Tr) and dry matter accumulation per plant (leaf sheath, grain and stems) from anthesis to 20 days after anthesis. Under W2N1 treatment, the above indices did not increase significantly with the increase of water and nitrogen supply. Analysis of yield and water-nitrogen use efficiencies revealed that yields under W2N1, W2N2, W3N1 and W3N2 treatments were significantly higher than those under W1N0, W1N1, W1N2, W2N0and W3N0treatments. The highest yield was achieved under W2N2 treatment (8 395.88 kg·hm-2), followed by that under W2N1treatment (8 208.37 kg·hm-2). Irrigation water use efficiency under W2N1 treatment reached 1.37 kg·m-3, significantly surpassing that of the W3N1 (1.22 kg·m-3) and W3N2 (1.23 kg·m-3) treatments. Precipitation use efficiency was highest under W2N2 treatment (33.66 kg·mm-1·hm-2), showing no significant difference from the W2N1 treatment. Both partial factor productivity of nitrogen (34.20 kg·kg-1) and agronomic nitrogen use efficiency (6.08 kg·kg-1) were highest under W2N1 treatment. Path analysis showed that photosynthetic characteristics, dry matter accumulation and agronomic traits direct regulated wheat yield, and the direct effect values were 0.889, 0.334 and 0.137, respectively. Water and nitrogen input mainly affected wheat yield through indirect pathway, and the indirect effect value was 1.27. In summary, photosynthetic characteristics are important factors affecting wheat yield, and water and nitrogen inputs affect yield mainly through the indirect drive of photosynthetic characteristics. Under the condition of drip irrigation in the Ili River Valley, taking yield and water and nitrogen use efficiency into consideration, the recommended drip irrigation amount is 6 000 m3·hm-2, and the nitrogen application rate is 240 kg·hm-2 (W2N1) is the optimal combination.
PDF
26
8
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
