Study And Evaluation On Ecological Service Function Of Different Artificial Shrubbery In The South Foot Of Langshan Mountain

In this paper,four kinds of artificial shrub forests,namely Amygdalus mongolica,Zygophyllum xanthoxylon,Ammopiptanthus mongolicus and Ziziphus jujuba var.spinosa,were investigated at the southern foot of Langshan Mountain.On this basis,The analytic hierarchy process and coefficient of variation method are used to determine the subjective and objective weight of the evaluation index,and the game theory method is used to determine the comprehensive weight.Finally,TOPSIS dynamic comprehensive evaluation method is used to comprehensively evaluate the four ecological service functions of artificial shrub community.The results are as follows:（1）In terms of plant diversity protection function,the diversity of the four artificial shrubs was the best,0.91;The uniformity of overlord is the best,which is 0.99;The dominance and evenness of Ilex mongolica were the best,which were 0.57 and 1.10respectively.（2）In terms of carbon sequestration function,in terms of vegetation carbon sequestration,the carbon reserves of the four kinds of artificial shrub forests are afforestation tree species>understory shrubs>herbs.The total carbon reserves of the four kinds of shrub forests are 659.42 kg C·hm^-2,529.63 kg C·hm^-2,439.25 kg C·hm^-2and1502.00 kg C·hm^-2respectively;In terms of soil carbon fixation,the organic carbon content,total carbon content and organic carbon storage of the four artificial shrubs are the highest in the soil layer at the depth of 0-10cm,and all decrease with the increase of soil depth,and the surface accumulation phenomenon is obvious.The organic carbon storage of the four kinds of artificial shrubs was as follows:wild jujube(4.93 t·hm^-2)>Mongolian almond(4.81 t·hm^-2)>overlord(3.19 t·hm^-2)>sand Holly(2.87 t·hm^-2).（4）In terms of water conservation function,in terms of canopy water holding capacity,the average canopy effective water holding capacity of afforestation tree species is as follows:overlord（40.41%）>wild jujube（30.62%）>sand Holly（27.02%）>Mongolian almond（23.41%）.The average canopy effective water holding capacity of shrub layer and herb layer under the forest is the highest,34.87%and 41.27%respectively.In terms of soil water holding capacity,the average value of 0-50cm soil water content is jujube artificial shrub（3.37%）>overlord artificial shrub（2.46%）>Mongolian almond artificial shrub（2.29%）>sand Holly artificial shrub（1.24%）.The maximum soil water holding capacity and capillary water holding capacity are sand holly,which are 21.26%and 20.59%respectively.（5）The comprehensive weight results showed that the index weights of afforestation tree species carbon storage（0.1454）and soil carbon storage（0.2716）were the most prominent.Through the analysis of TOPSIS comprehensive evaluation method,the ecological service function of four kinds of artificial shrub forests is ranked as sour jujube（0.891）>Mongolian almond（0.473）>overlord（0.296）>sand Holly（0.111）,indicating that the ecological service function of sour jujube artificial shrub forest is the strongest and sand Holly artificial shrub forest is the weakest.