干旱地区农业研究2025，Vol.43Issue(3)：22-33,12.DOI:10.7606/j.issn.1000-7601.2025.03.03
柴达木盆地8种高寒禾草耐盐碱性评价
Evaluation of saline-alkali tolerance of eight alpine grasses in the Qaidam Basin
摘要
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 splen-dens(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%,re-spectively,significantly higher than other species(P<0.05).NS and LP had relatively high soil noncapillary poros-ity and capillary porosity with 2.32%,39.18%and 2.00%,41.51%,respectively.NS had the lowest soil bulk den-sity 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 a-vailable 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 anal-ysis 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 indi-cate 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.关键词
高寒禾草/盐碱地/生长特性/理化性质/灰色关联度/柴达木盆地Key words
alpine grass/saline-alkali soil/growth characteristics/physicochemical properties/grey correlation degree/Qaidam Basin分类
农业科技引用本文复制引用
段成伟,杨鑫光,孙华方,张湑泽,王丽蓉,李婷..柴达木盆地8种高寒禾草耐盐碱性评价[J].干旱地区农业研究,2025,43(3):22-33,12.基金项目
青海省青海民族大学理工类科学研究项目(2024XJMD06) （2024XJMD06）
青海省2024年创新平台建设专项项目(2024-SF-J10) （2024-SF-J10）
2023年中央科研创新平台建设项目(30160101141) （30160101141）
青海省青海民族大学理工类科学研究项目(2024XJMD07) （2024XJMD07）
