平茬对鄂托克旗生态脆弱区柠条叶功能性状的影响OA北大核心CSTPCD

In order to investigate the effects of stumping on leaf functional traits of Caragana korshinskii in the ecologically fragile area of Otog Banner,and screen the optimal height of stumping to promote the growth of Caragana korshinskii,the forest of Caragana korshinskii in the ecologically fragile area of Otog Banner,Ordos,Inner Mongolia,was as materials.The effects of stumping on leaf functional traits of Caragana korshinskii were analyzed by using the unstumping plants as control(CK)and the height of stumping at 0(H1),10(H2),15(H3)and 20 cm(H4).The results showed that the stump had no significant effect on carbon(C)content,and had significant effect on leaf area(SLA),leaf tissue density(LTD),leaf dry matter content(LDMC),leaf nitrogen(N)content,C/N,net photosynthetic rate(Pn),transpiration rate(Tr)and stomatal conductance(Gs).The SLA,LTD,LDMC,N and C/N of H3 were significantly different from those of CK.Compared with CK,the increase of SLA,N,Pn,Tr and Gs after stumping were 7.87%～19.46%,3.81%～18.75%,17.71%～40.86%,14.85%～35.30%and 13.93%～27.68%,respectively.The decrease of LTD,LDMC and C/N were 0.18%～1.20%,1.51%～4.84%and 5.31%～16.82%,respectively.The Pn and Tr showed"double peak"trend and Gs showed a"single peak"trend.The SLA,N,Pn,Tr and Gs were positively correlated with each other,and negatively correlated with LTD,LDMC and C/N,respectively.After stumping,Caragana korshinskii showed the"fast investment-return type"resource tradeoff strategy.The leaf functional traits of different stumping height treatments were showed H3＞H2＞H1＞H4＞CK,and the best treatment was H3,which indicated that 15 cm stump height should be adopted for improving the growth rate of Caragana korshinskii in Otog Otog Banner.