摘要
狼毒(Stellera chamaejasme)是分布在我国北方草原地区的主要毒杂草。本研究以祁连山东缘高寒草地狼毒自然种群为研究对象,以狼毒株丛大小代替其定居时间变异,探究了狼毒定居对其根区土壤pH和化学养分的影响。结果表明:随着株丛增大,狼毒贴根土壤速效钾含量显著升高(P<0.01),pH显著降低(P<0.05),全氮、全钾、全磷和速效磷含量无明显变化(P>0.05)。根区外围土壤全氮和速效磷含量随株丛的增大而显著减少(P<0.05),pH、全钾、全磷和速效钾含量无显著变化(P>0.05)。研究结果表明,在高寒草地,狼毒自然种群其种苗定居对生境土壤环境无明显选择性,定居后能通过影响土壤酸碱度和化学养分含量改变其生境土壤环境。
Stellera chamaejasme is a major poisonous weed distributed in northern China and an important indicator of grassland degradation.In this study,a natural population of S.chamaejasme in an alpine grassland located on the eastern edge of the Qilian Mountains was taken as the research object,and the plant sizes(branches)of S.chamaejasme were used to represent the variations in settlement time.We aimed to explore the effect of settlement of S.chamaejasme on soil pH and chemical nutrients in its root microenvironment at different time scales.The results showed that with an increase in plant branches,the content of soil available potassium(AK),which is close to the root of S.chamaejasme,increased significantly(P<0.01),while the pH value decreased significantly(P<0.05).No significant linear relationship was observed between total nitrogen(TN),total potassium(TK),total phosphorus(TP),available phosphorus(AP),and branching number(P>0.05).The contents of TN and AP in the marginal soil of the root zone decreased significantly with an increase in the number of plant branches(P<0.05),and there was no significant linear relationship between the pH,TK,TP,and AK contents in the marginal soil and branching number(P>0.05).In conclusion,the natural population of S.chamaejasme in alpine grasslands has no obvious selectivity for the soil environment of the habitat to be settled,but it can change the soil environment in its habitat by affecting soil pH and chemical nutrients after settlement.
作者
汪睿
黄宗昌
夏建强
李彦宝
李佳欣
张勃
WANG Rui;HUANG Zongchang;XIA Jianqiang;LI Yanbao;LI Jiaxin;ZHANG Bo(College of Grassland Science,Gansu Agricultural University,Lanzhou 730070,Gansu,China)
出处
《草业科学》
CAS
CSCD
北大核心
2023年第7期1720-1728,共9页
Pratacultural Science
基金
国家自然科学基金(31960349、4141014)。
关键词
高寒草甸
狼毒
株丛大小
根区土壤
土壤化学性质
营养空间异质性
空间异质程度
定居生境
alpine meadow
Stellera chamaejasme
plant size
root zone soil
soil chemical properties
nutrient spatial heterogeneity
degree of spatial heterogeneity
settled habitat
