草业学报2017，Vol.26Issue(5)：81-91,11.DOI:10.11686/cyxb2016242
养分添加对贝加尔针茅草原6种植物叶片性状的影响
Effects of nutrient addition on leaf traits of six plant species in a Stipa baicalensis grassland in Inner Mongolia,China
摘要
Abstract
Nutrient addition is an effective management measure for recovery of degraded grassland.Stipaba-icalensisgrassland is a type of meadow steppe that plays an important role in livestock husbandry in China.We conducted a field experiment to explore the mechanisms underlying variation in plant leaf traits in a mature typ-ical steppe ecosystem in Inner Mongolia where nutrients have been added since 2010.The experiment had a randomized block design with six blocks of eight treatments:CK (control,no nutrient addition),N (N addi-tion only,100 kg/ha),P (P addition only,100 kg/ha),K (K addition only,100 kg/ha),NP (mixed N and P addition,100 kg/ha each),NK (mixed N and K addition,100 kg/ha each),PK (mixed P and K addition,100 kg/ha each),and NPK (mixed N,P,and K addition,100 kg/ha each).We selected six dominant and sub-dominant plant species for analyses:S.baicalensis,Leymuschinensis,Achnatherumsibiricum,Melissitusru-thenica,Serratulayamatsutanna,and Filifoliumsibicum.Together,these species account for >90% of the total community aboveground biomass.We investigated variations in specific leaf area (SLA),leaf chlorophyll content,leaf N content,and leaf P content of the six plants under different nutrient treatments,to determine their responses to variations in soil physical and chemical properties.In all six plant species,the SLA,chloro-phyll content,and leaf nutrient contents varied among different nutrient treatments,but the scope and direc-tion of changes differed among plant species.A correlation analysis demonstrated that leaf SLA was positively correlated with leaf chlorophyll content and leaf N content (P<0.01),and with leaf P content (P<0.05). Leaf chlorophyll content was positively correlated with leaf N content and soil NH4 +-N (P<0.01 ).Leaf N content was positively correlated with soil pH (P<0.01).Leaf P content was positively correlated with soil P, soil available P,and soil pH (P<0.01).Our results indicate that there is a very low leaf N content,and that plant growth is N-limited in theS.baicalensisgrassland in Inner Mongolia,China.Different species had differ-ent responses to N addition.Differences in soil nutrients may be one important reason for the observed varia-tions in leaf structure and leaf nutrient contents.关键词
贝加尔针茅草原/养分添加/叶片性状/土壤理化性质Key words
Stipabaicalensisgrassland/nutrient addition/leaf trait/soil physic-chemical properties引用本文复制引用
刘红梅,李洁,于丽,皇甫超河,杨殿林..养分添加对贝加尔针茅草原6种植物叶片性状的影响[J].草业学报,2017,26(5):81-91,11.基金项目
国家自然科学基金项目(31170435)资助. （31170435）
