Research On Leaf C?N?P?K Stoichiometry Of Recovered Vegetation In Haizhou Opencast Coalmine Dump

In this paper,through investigating the growth conditions of recovered vegetation in Haizhou Opencast Coalmine Dump,choosing 4 kinds of recovered vegetation:Robinia pseudoacacia Linn.,Periploca sepium Bunge,Ulmus pumila and Vitex chinensis var.Heterophylla.We have sampled the leaves of different recovered vegetation type then respectively test the Leaf N,P,K,C,water content,and soil total N,available N,water content.At the same time,the determination of all day and record the environmental factors: temperature,humidity,illumination and wind speed.Using SPSS16.0 software processing analysis of the relationship between leaf element,the influence of soil factors on leaf N content.Site reveal restore vegetation blade element change rule,ensure mine limit factor of vegetation restoration.It is showed that:(1)Leaf N,P,K content presented downtrend with the seasons change,leaf C content changed relatively stable.(2)Shrubs of C/N value slightly higher than the trees,and trees of N/P,N/K value was higher than shrub.(3)Leaf N content and leaf P,K,C/N,N/K value of 4 kinds of recovered vegetation has good correlation:Leaf N,P content of trees(Ulmus pumila and Robinia pseudoacacia Linn.)has a very significant positive correlation(P<0.01).Leaf N,P content of shrubs(Periploca sepium Bunge and Vitex chinensis var.Heterophylla)was significantly positive correlation(P<0.05).Leaf N,K content of Periploca sepium Bunge and Robinia pseudoacacia Linn.was significantly positive correlation(P<0.05).Leaf N,K content of Ulmus pumila and Vitex chinensis var.Heterophylla has a very significant positive correlation(P <0.01).Leaf N,C/N of 4 kinds kinds of recovered vegetation significant negative correlation(P<0.01).(4)Soil total N content,soil available N content,soil water content were the important soil factors affect leaf N content.Leaf N and soil total N content,soil available N content,soil water content of 4 kinds kinds of recovered vegetation was significantly positive correlation(P < 0.05).Leaf N content of shrubs were greatly influenced by 10-20 cm soil available N content and soil water content.The trees were greatly influenced by 10-20 cm soil water content.