摘要
植物对营养元素的吸收利用是生态系统物质循环的关键过程,同时也是退化草地生态系统恢复和重建的重要问题。为探讨草原生态系统植物对元素的吸收利用规律,在内蒙古锡林河流域的羊草草原选取羊草(Leymus chinensis、冰草(Agropyron cristatum)、大针茅(Stipa grandis)、西伯利亚羽茅(Achnatherum.sibirica)、芯芭(Cymbaria dahurica.)、洽草(Koeleria cristata)等11种主要植物为研究对象,分析比较了10种营养元素的含量特征。结果表明,(1)研究区主要植物各元素含量特征属于w(K)>w(Ca)>w(Mg)型。元素的变异系数均小于1,元素种间差异不显著。(2)相关性分析表明,C和Fe、C和Cu、N和K、N和Mg、P和K、P和Mg、Ca和Mg、Fe和Cu均为极显著相关(P≤0.01),C和Fe、C和Cu是负相关,其它均为正相关;N和P、N和Ca、K和Mg显著正相关(P≤0.05)。(3)禾本科植物具有低N-P-K-Ca特征,Fe、Cu元素含量较高,非禾本科物种Mn、Zn、P、Mg、Ca、K、N、C元素含量较高,其中Ca、K、Mg元素达到极显著差异(P≤0.01),N达到显著差异(P≤0.05)。(4)利用主成分分析法对植物营养元素水平进行综合评价,表明芯芭、洽草、菊叶委陵菜的营养元素含量水平较高,吸收营养元素的能力较强。
The absorption and utilization of plant nutrients is the key process of ecosystem material cycle, and it’s also a important issue for the restoration and reconstruction of degraded ecosystem. To explore the absorption and utilization regularities on nutrients in the grassland ecosystem plants, the characteristics of 10 elements in 11 main species such asLeymus Chinensis, Agropyron c ristatum, Stipa grandis, Achnatherum. sibirica, Cymbaria dahurica., Koeleria cristata, etc., collected in the Xilin River Basin, were investigated. The results showed that： （1） The contents of plant elements in the study area belongs to （K） 〉 （Ca） 〉 （Mg） type. The coefficients of variation of elements contents were less than 1, indicated there were no obvious differences among plant elements of different species. （2） Correlation analysis among plant elements indicated N and K, N and Mg, P and K, P and Mg, Ca and Mg, Fe and Cu were of markedly positive correlation （P≤0.01）, but C and Fe, C and Cu were of negative correlation; N and P, N and Ca, K and Mg were statistically significant （P≤0.05）. （3） Gramineous plants have lower N、P、K、Ca and higher Fe, Cu content, but Mn, Zn, P, Mg, Ca, K, N, C in non-gramineous plants were higher, while Ca, K, Mg were statistically most significant difference （P≤0.01）, as well as N （P≤0.05）. And （4） we used principal component analysis to evaluate the level of plant nutrients, as a result,Cymbaria dahurica L.,Koeleria cristata andPotentilla tanacetiflolia had higher nutrients content, so they had a better ability to absorb nutrients.
出处
《生态环境学报》
CSCD
北大核心
2015年第7期1118-1124,共7页
Ecology and Environmental Sciences
基金
国家自然科学基金项目(41071138)
关键词
羊草草原
主要植物
元素含量
Leymus Chinensis grassland
main species
element contents
