草业学报2026，Vol.35Issue(8)：1-13,13.DOI:10.11686/cyxb2025329
毛乌素沙地不同年限柠条固沙林林下草本土壤种子库特征研究
Characteristics of understory herbaceous soil seed banks in Caragana korshinskii sand-fixation thickets of different ages in the Mu Us Sandy Land
摘要
Abstract
The soil seed bank serves as a crucial seed source for vegetation restoration in sandy areas.Investigating how it changes during prolonged periods of sand fixation holds significant scientific importance for combating desertification.This study focused on Caragana korshinskii sand-fixing thickets of different ages(10,30,50,and 70 years)in the Mu Us Sandy Land.By integrating field surveys,seed bank germination experiments,and soil physicochemical property analysis,we systematically analyzed the evolution of the soil seed bank and its driving factors across different periods of sand fixation.The results show that 28 plant species germinated from the soil seed bank.These 28 species belonged to 22 genera and 8 families,predominantly Asteraceae,Poaceae,and Amaranthaceae.As the period of sand fixation increased,the proportion of annual herbaceous plants gradually decreased,while that of perennial herbaceous plants progressively rose.The Shannon-Wiener diversity index,Margalef richness index,and Simpson dominance index all exhibited increasing trends with prolonged sand fixation,whereas the Pielou evenness index gradually declined.The soil seed bank density increased significantly as the period of sand fixation increased,from 303.31 to 5719.72 seeds·m⁻².The seed bank was primarily concentrated in the 0-2 cm and 2-5 cm soil layers,and decreased progressively with increasing soil depth.The similarity between the soil seed bank and aboveground vegetation exhibited moderate levels across all sites,except in the 30-year-old thicket,and showed a fluctuating increase with prolonged sand fixation.A redundancy analysis revealed that aboveground vegetation species evenness(F=4.0,P=0.016)was the significant vegetation factor affecting the seed bank,while soil available nitrogen(F=13.7,P=0.002)was the primary soil factor driving the seed bank.In conclusion,as the duration of sand fixation increased,the soil seed bank exhibited a successional trend characterized by enhanced diversity and increased density.This study provides a scientific basis for vegetation restoration and potential ecological enhancement in the Mu Us Sandy Land.关键词
毛乌素沙地/柠条/土壤种子库/生态恢复Key words
Mu Us Sandy Land/Caragana korshinskii/soil seed bank/ecological restoration引用本文复制引用
石文杰,李小伟,任振强,刘吉德,刘玲,郝淑香,李云霞..毛乌素沙地不同年限柠条固沙林林下草本土壤种子库特征研究[J].草业学报,2026,35(8):1-13,13.基金项目
宁夏回族自治区自然科学基金项目(2024AAC03102)资助. （2024AAC03102）
