| Evaluation of saline\|alkali tolerance of eight alpine grasses in the Qaidam Basin |
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| DOI：10.7606/j.issn.1000-7601.2025.03.03 |
| Key Words: alpine grass saline\|alkali soil growth characteristics physicochemical properties grey correlation degree 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 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 | | 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: |
| In this study, the dynamic changes in grass growth characteristics, soil physicochemical properties, and their correlations were analyzed using eight alpine grass species — Puccinellia distans (PD), Neotrinia splendens (NS), Leymus chinensis (LC), Lolium perenne (LP), Festuca rubra (FR), Elymus nutans (EN), Poa pratensis (PP), and Puccinellia tenuiflora (PT) — which are primarily promoted for grassland restoration on the Qinghai\|Xizang (Tibetan) Plateau. These species were cultivated for three years, and their saline\|alkali tolerance was comprehensively evaluated using the grey correlation degree method based on field investigations and laboratory studies. The aim was to select suitable and adaptable pioneer grass species for planting in the saline\|alkali soil of the Qaidam Basin. The results showed that under saline\|alkali stress, the coverage and aboveground biomass of NS, LP, and PP were 63.00%, 60.75%, 58.50%, and 16.05, 16.50, 10.05 g·m-2, respectively, significantly higher than other species (P<0.05). NS had the highest soil initial gravimetric water content, which was 11.16%, significantly higher than PD, LC, FR, EN and PT (P<0.05). The soil saturated water\|holding capacity, capillary capacity and field capacity of NS and LP were 28.63%, 27.09%, 26.53% and 27.98%, 26.61%, 26.01%, respectively, significantly higher than other species (P<0.05). NS and LP had relatively high soil noncapillary porosity and capillary porosity with 2.32%, 39.18% and 2.00%, 41.51%, respectively. NS had the lowest soil bulk density and pH, which were 1.18 g·cm-3 and 8.53, respectively. FR had the highest soil organic matter content, which was 11.04 g·kg-1. The soil available nitrogen content of PD, LC and FR were 38.90, 39.85, 39.00 mg·kg-1, respectively, significantly higher than other species (P<0.05); The soil available phosphorus content and available potassium content of LC were 19.73 mg·kg-1 and 398.98 mg·kg-1, respectively, significantly higher than other species (P<0.05). Linear regression analysis revealed a highly significant correlation between the aboveground biomass of grasses and soil physical properties, as well as available nutrient content. Redundancy analysis identified soil non\|capillary porosity, capillary capacity, and capillary porosity as the most significant factors influencing the growth characteristics of eight alpine grasses (P<0.05), with interpretation rates of 72.30%, 4.30%, and 2.50%, respectively. The comprehensive evaluation results based on the grey correlation degree indicate that NS, LP, PP, and EN exhibit excellent performance and are more suitable for promotion and cultivation in the saline\|alkali soil of the Qaidam Basin. |
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