| Comprehensive evaluation and screening of saline\|alkali tolerance of cereal crop in saline\|alkali soil of Qaidam Basin |
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| DOI：10.7606/j.issn.1000-7601.2025.06.03 |
| Key Words: cereal crops saline\|alkali tolerance comprehensive evaluation grey relational analysis Qaidam Basin |
| Author Name | Affiliation | | DUAN Chengwei | College of Eco\|Environment and Resources, Qinghai Minzu University, Xining, Qinghai 810007, China
Qinghai Provincial Key Laboratory of High Value Utilization of Characteristic Economic Plants, Xining, Qinghai 810007, China | | YANG Xinguang | College of Politics and Public Administration, Qinghai Minzu University, Xining, Qinghai 810007, China | | SUN Huafang | College of Eco\|Environment and Resources, Qinghai Minzu University, Xining, Qinghai 810007, China
Qinghai Provincial Key Laboratory of High Value Utilization of Characteristic Economic Plants, Xining, Qinghai 810007, China | | ZHANG Xuze | College of Eco\|Environment and Resources, Qinghai Minzu University, Xining, Qinghai 810007, China
Qinghai Provincial Key Laboratory of High Value Utilization of Characteristic Economic Plants, Xining, Qinghai 810007, China | | WANG Lirong | College of Eco\|Environment and Resources, Qinghai Minzu University, Xining, Qinghai 810007, China
Qinghai Provincial Key Laboratory of High Value Utilization of Characteristic Economic Plants, Xining, Qinghai 810007, China | | LI Ting | College of Eco\|Environment and Resources, Qinghai Minzu University, Xining, Qinghai 810007, China |
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| Abstract: |
| This study aimed to clarify the saline\|alkali tolerance of different cereal crop species and screen out cereal crop species with strong adaptability suitable for planting in Qaidam basin saline\|alkali soil. The dynamic changes of cereal crop growth characteristics, yield traits, soil physicochemical properties, and their correlations during a complete growing season (May to September) using six cereal crops (Hordeum vulgare var. nudum(HVN), Sorghum bicolor (SB), Triticum aestivum (TA), Hordeum vulgare (HV), Triticosecale wittmack (TW), and Avena sativa (AS)) were investigated by field investigation and laboratory studies. The results showed that the coverage and adult plant density of HV under saline\|alkali stress were 83.25% and 68.25 plants·m-2, respectively. AS had the highest aboveground biomass (fresh weight), which was 639.90 g·m-2, significantly higher than other cereal crops (P<0.05). The aboveground biomass (dry weight) of HVN, TW, and AS were 119.00 g·m-2, 126.00 g·m-2, and 139.40 g·m-2, respectively, significantly higher than other cereal crops (P<0.05). The spike number, thousand grains weight, and grain yield of HV were 7 311.15 spike·hm-2, 42.28 g, and 3 152.00 kg·hm-2, respectively. TW had the highest grain number per spike, which was 4.32 grain number·spike-1, significantly higher than other cereal crops (P<0.05). The soil initial gravimetric water content, saturated water\|holding capacity, capillary capacity, and field capacity of HV were 8.21%, 33.12%, 32.81%, and 31.22%, respectively, significantly higher than other cereal crops (P<0.05). The soil noncapillary porosity of TA and the capillary porosity of HV were the highest, at 4.53% and 46.77%, respectively. AS had the lowest soil bulk density, and HV had the lowest pH, which were 1.17g·cm-3 and 8.71. HV had the highest soil organic matter content, which was 17.49 g·kg-1. The soil available nitrogen and phosphorus content of AS were the highest, at 40.83 mg·kg-1 and 19.93 mg·kg-1, respectively, both significantly higher than other cereal crops (P<0.05). AS had the highest soil available potassium content, which was 403.98 mg·kg-1, significantly higher than HVN, SB, and TA (P<0.05). The Spearman correlation test and Mantel test showed that there is a significant relationship between the growth characteristics and yield traits of cereal crops and soil variables under saline\|alkali stress, and there was also a significant relationship among soil variables. Variance partitioning analysis showed that soil moisture, soil nutrients, and their interaction are important factors in explaining the changes of growth characteristics and yield traits of cereal crops under saline\|alkali stress;the explanatory rates were 28.0%, 5.8%, 28.1%, and 27.2%, 9.8%, 10.6%, respectively. Random forest analysis further determined the main soil characteristic predictors of growth characteristics and yield traits of six cereal crops. Initial gravimetric water content was the most important variable for predicting the growth characteristics and yield traits of six cereal crops. The comprehensive evaluation results of grey relational analysis showed that HV,AS, and TW perform excellently and are suitable for popularization and planting in saline\|alkali areas of the Qaidam Basin. |
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