干旱区研究2024，Vol.41Issue(5)：830-842,13.DOI:10.13866/j.azr.2024.05.11
典型固沙植物种子萌发和幼苗生长对土壤水分的响应
Seed germination and seedling growth of typical sand-fixing plants in response to soil moisture
摘要
Abstract
Seed germination and the seedling growth of sand-fixing plants are decisive aspects of land desertifica-tion management,and soil moisture is the main limiting factor affecting these aspects.In this study,we compared and analyzed the seed germination of three sand-fixing plants under different moisture gradients(4%,6%,8%,10%,15%,20%,and 25%)in an indoor potting experiment using Hedysarum scoparium,Caragana korshinskii,and Artemisia desertorum to investigate the response of seed germination and seedling growth of sand-fixing plants to changes soil in moisture.The results showed that:(1)significant differences(P<0.05)were observed in the seed germination characteristics of the three sand-fixing plants as the soil moisture increased.The germina-tion rates tended to increase and then decrease as the soil moisture increased.C.scoparium had the highest germi-nation rate at 15%and 20%soil moisture(83.00%in both);C.korshinskii had the highest germination rate at 10%soil moisture(73.00%);and the seed germination rate of A.desertorum reached the maximum value of 77.50%at 15%soil moisture,and then slowly decreased,although the change was not significant.(2)The leaf ar-ea and root length of the three plants showed tended to first increase and then decrease as the soil moisture in-creased,and the specific leaf area and root:crown ratio tended to decrease and then increase.(3)The highest bio-mass of C.scoparium,C.korshinski,and A.desertorum seedlings was 0.0733 g,0.1142 g,and 0.0363 g at 10%,8%,and 20%soil moisture,respectively,and the aboveground biomass was significantly higher than the below-ground biomass(P<0.05),although the allocation of belowground biomass by C.korshinski seedlings was higher than that of C.scoparium and A.desertorum.(4)The SOD activity,POD activity,CAT activity,Pro content,SS content,and Chl content of the three sand-fixing plants tended to increase and then decrease as the soil moisture increased,whereas the MDA content,membrane permeability,and relative water content tended to decrease and then increase.Based on the above results,it was concluded that the three sand-fixing plants of C.scoparium,C.korshinski,and A.desertorum had the best seedling growth at 15%,8%and 8%soil moisture,respectively,through the analysis of the affiliation function method.Therefore,when these three sand-fixing plants are used for vegetation restoration,the changes in soil moisture caused by rainfall conditions should be fully considered in addition to the seeds'own traits to improve the seedling emergence rate and the success of seedling growth.关键词
土壤水分胁迫/盆栽试验/种子萌发/幼苗生长/表型Key words
soil moisture stress/pot experiment/seed germination/seedling growth/phenotype引用本文复制引用
杨竹青,王磊,张雪,申建香,张伊婧,李欣宇,张波,牛金帅..典型固沙植物种子萌发和幼苗生长对土壤水分的响应[J].干旱区研究,2024,41(5):830-842,13.基金项目
宁夏科技创新领军人才项目(2021GKLRLX13) （2021GKLRLX13）
宁夏重点研发计划项目(2022BEG02012) （2022BEG02012）
自治区重点研发项目(2021BEG030-08) （2021BEG030-08）
宁夏自然科学基金项目(2020AAC03108) （2020AAC03108）
