科尔沁沙地退化植被恢复过程中碳氮化学计量特征的变化

doi:10.12118/j.issn.1000-6060.2019.03.17

Abstract

Abstract: In this paper,the carbon and nitrogen stoichiometric amounts of plantsoil system were investigated along with the restoration sequence of degraded vegetation in Horqin Sandy Land,Inner Mongolia,China.This would be helpful to definite the changes of carbonnitrogen stoichiometric amounts of plantsoil system in the restoration of degraded vegetation and quantify the relationship between carbonnitrogen stoichiometric amounts and species richness,which provided the theoretical foundation for the sustainable management and utilization of sandy grassland.A total of 24 plots with the size of 20 m×20 m were set up at four habitats ( mobile dune,semifixed dune,fixed dune and grassland ),each habitat had 6 replicated plots.The distance between each plot was in the range from 0.5 to 8 km.Three quadrats with the size of 1 m×1 m were selected for plant and soil sampling in each plot in midAugust of 2011,2013 and 2015.Then the C and N contents of plantsoil system were analysed by Costech Elemental Combustion System 4010,Italy.The resluts shown as follows: (1) With the restoration of degraded vegetation,the C and N contents and C/N ratios of aboveground plant,litter and root had a fluctuated change trend,while the C and N content and C/N ratio of soil (0～10 cm) was increased significantly (P <0.05).The N content of aboveground plant in mobile dune was the highest,thus the C/N ratio was much lower than other habitats.On the other hand,the N contents of litter and root in semifixed dune were relatively lower than other habitats,which led to the higher C/N ratios of litter and root in semifixed dune. (2) From 2011 to 2015,the average C content of above ground plant changed a little,while the N content was significantly increased (P <0.01).The C and N content and C/N ratio of litter fluctuated smoothly,while there was no significant difference of that for root between years.On the other hand,the C content and C/N ratio of soil changed undulately,but the N content was increased significantly ([WTBX]P[WTBZ]<0.01). (3) The C/N ratio of aboveground plant,litter,soil had positive linear relationship with species richness in the restoration process of degraded vegetation (P <0.01).In conclusion,the succession of dominant vegetation in the restoration process of degraded vegetation led to the changes of C and N stoichiometric amounts of plantsoil system,the N use efficiency was also increased with the restoration of degraded vegetation.Moreover,the increase of fencing time promotes the accumulation of soil N in sandy land.

Key words: C and N contents, C/N ratios, restoration of degraded vegetation, restoration ages, Horqin Sandy Land

LYU Peng ZUO Xiao'an, SUN Shanshan, ZHANG Jing, ZHAO Shenglong, CHENG Qingping, HU Ya.

Changes of carbon and nitrogen stoichiometry in the restoration process of degraded vegetation in Horqin Sandy Land [J].Arid Land Geography, 2019, 42(3): 606-614.

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Changes of carbon and nitrogen stoichiometry in the restoration process of degraded vegetation in Horqin Sandy Land

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