摘要
【目的】研究荒漠植物功能性状与生物量之间的关系随土壤水盐梯度的变化规律,为荒漠地区植物恢复和土壤盐渍化治理提供科学依据。【方法】测定植物的叶片形态、生理特征、植物生物量以及土壤的水分和盐分含量,并将水盐分为3个梯度,分析不同水盐梯度下植物生物量对功能性状的响应。【结果】(1)植物冠幅面积(S)在3种土壤水盐梯度下均有显著性差异(P<0.05);植物叶片磷含量(LPC)在低水盐群落中适应性高于中高水盐梯度。(2)植物地下生物量(AGB)低水盐梯度显著低于高水盐梯度(P<0.05);地上生物量在土壤水盐梯度上没有表现出显著性差异(P>0.05)。(3)对植物功能性状和生物量的冗余分析(RDA)在3种梯度下,植物冠幅面积(S)、株高(H)与生物量相关性均较高,植物在生长发育过程中表型性状S、H、SLA会对生物量增长有促进作用。(4)荒漠植物功能性状对生物量的指示能力是随着土壤水盐梯度的升高而逐渐减弱。【结论】艾比湖干旱荒漠地区植物的生物量随土壤水盐的增高而减少。在低水低盐土壤区域,植物的适应性较强;在高水盐土壤区域,植物叶片表型性状比生理性状更明显;在中水盐土壤区域,植物功能性状与生物量差异及联系不明显。干旱荒漠区土壤盐含量的增高已经对植物生长产生了迫害,造成了严重的生态环境问题,在干旱荒漠生态系统中,植物的功能性状及生物量减少会使荒漠土地退化,导致生态系统功能的变化。
【Objective】The purpose of this study is to provide a scientific basis for plant restoration and soil salinization management in desert areas.【Methods】Plant leaf morphology,physiological characteristics,plant biomass and soil moisture and salt content were measured,and water salinity was divided into three gradients to analyze the response of plant biomass to functional traits under different water and salt gradients.【Results】The results showed that:(1)canopy area(S)had significant differences under three soil water and salt gradients(P<0.05);The adaptability of plant leaf phosphorus content(LPC)in low salinity community was higher than that in medium salinity gradient.(2)The underground biomass(AGB)of plants with low salinity gradient was significantly lower than that with high salinity gradient(P<0.05);The aboveground biomass showed no significant difference in soil water and salt gradient(P<0.05).(3)Redundancy analysis(RDA)of plant functional traits and biomass showed that under the three gradients,canopy area(S)and plant height(H)were highly correlated with biomass,indicating that phenotype traits S,H and SLA could promote biomass growth during plant growth and development.(4)Multiple regression model showed that the indicator ability of desert plant function to biomass was gradually weakened with the increase of soil water and salt gradient.【Conclusion】The biomass of plants in the arid desert area of Aibi Lake decreases with the increase in soil water and salt.In the area of low water and low salt soil,plant adaptability is stronger.Phenotypic traits of plant leaves were more obvious than physiological ones in the high water and salt soil regions.The difference and correlation between plant function and biomass are not obvious in the soil area of medium water and salt.The increase of soil salt content in arid desert areas has already persecuted plant growth and caused serious ecological environmental problems.In arid desert ecosystems,the reduction of plant functional properties and biomass wi
作者
陈昱东
吕光辉
张磊
蒋腊梅
王恒方
CHEN Yudong;LV Guanghui;ZHANG Lei;JIANG Lamei;WANG Hengfang(College of Resources and Environmental Sciences,Xinjiang University/Institute of Arid Ecology and Environment,Xinjiang University/Key Laboratory of Oasis Ecology,Ministry of Education,Urumqi 830046,China)
出处
《新疆农业科学》
CAS
CSCD
北大核心
2022年第10期2574-2584,共11页
Xinjiang Agricultural Sciences
基金
国家自然科学基金(31560131)。
