准格尔旗矿区不同植物叶片的生态化学计量学研究

Ecological Stoichiometric Characteristics in Leaf Under Different Vegetation Types of Jungar Banner Opencast Coal Mining Area

以不同恢复年限下煤矿复垦区3种共有植物油松、沙棘、苜蓿的叶片作为研究对象,通过对其碳、氮、磷含量及生态化学计量学特征的研究,探讨退化生态系统植物内稳性、植物养分状况及不同植物与氮磷限制率的关系,以期为该复垦区植物的选择及复垦效果评价提供科学合理的建议与参考。结果表明:矿区植物叶片碳、氮、磷含量平均值分别为488.33,24.87,1.39g/kg,三种植物叶片碳含量随着恢复年限的增加均有所增加,其中油松叶片碳含量显著高于沙棘和苜蓿叶片碳含量(p<0.05),沙棘和苜蓿叶片氮含量显著高于油松叶片氮含量(p<0.05);矿区植物叶片C∶N,C∶P和N∶P平均值分别为26.76,374.72,18.32,在生活型方面三种植物叶片N∶P大小表现为灌木>草本>乔木,油松生长受到氮元素的限制,沙棘和苜蓿生长受到磷元素的限制;植物叶片氮含量与磷含量、C∶N,C∶P和N∶P呈极显著相关(p<0.01)。该研究结果有助于进一步了解准格尔旗矿区碳、氮、磷元素在不同植物间的相互作用规律与机制,对指导矿区植被恢复中树种选择有一定意义。

We characterized the contents and eco-stoichiometric proportions of carbon(C),nitrogen(N)and phosphorus(P)in leaves of three dominant species of plants,i.e.Pinus tabuliformis,Hippophae rhamnoides,Medicago sativa Linn.,at different restoration stages in Jungar Banner colliery reclamation area and further to explore relationships of plant homeostasis of degraded ecosystems with vegetation type and NP limiting rate and plant nutrition status in an attempt to provide some reasonable suggestions and references for selection of plants and evaluation of the effect of reclamation of colliery reclamation area.Results showed that the average contents of carbon,nitrogen and phosphorus in leaves of the plants were 488.33,24.87,1.39g/kg,respectively.The carbon content in the leaves of the three plants increased with the increase of the recovery time,among them,the carbon content of Pinus tabuliformis leaf was significantly higher than that of Hippophae rhamnoides and Medicago sativa Linn.(p<0.05),the nitrogen content of Hippophaerhamnoides and Medicago sativa Linn.leaf was significantly higher than that of Pinus tabuliformis(p<0.05).The average values of C∶N,C∶P and N∶P in leaves of the plants were 26.76,374.72,18.32,respectively.The three types of vegetation followed an order:shrubbery>forest>grass,indicating that N is the major limiting factor for growth of Pinus tabuliformis,P is the major limiting factor for growth of Hippophae rhamnoides and Medicago sativa Linn..The nitrogen contents in leaves of the plants were extremely significantly negatively related with the P content,C∶N,C∶P and N∶P ratio(p<0.01).The findings of this study can help fully further understand rules and mechanisms of the interactions of carbon,nitrogen and phosphorus in different components of the reclamation area in the Jungar Banner colliery.