Effect of micro-reclamation on different planted forest on the vegetation self-succession in the western mining subsidence area

Mycorrhizal fungi can form mycorrhizal symbiote with more than 80% of the plants on land,which is benefi- cial to the growth of plants in adversity. In order to explore the self-evolution law of reclaimed vegetation population af- ter the artificial inoculation of mycorrhizal fungi in coal mining subsidence,the experiment of artificial inoculation of mycorrhizal fungi is carried out on the reclaimed plants of coal mining subsidence. Pinus sylvestris var. mongolica Litv, Hippophaer hamnoides and Xanthoceras sorbifolia Bunge are the research object in Shendong coal mining subsidence. The species,life type composition and vegetation diversity index of vegetation were monitored by field in-situ monitoring method. The kriging interpolation was carried out by geostatistics method to obtain the difference of the vegetation species number and diversity index between the inoculation with mycorrhizal fungi after four years and the same period grown under natural conditions. The plantations can make a difference on the individual species,quality and communi- ty diversity of other species in the region between the two conditions. The results show that the species diversity of shrub layer in Pinus sylvestris var. mongolica Litv plantation that inoculated with mycorrhizal fungi is bigger than the natural condition. The species diversity of herb layer in Pinus sylvestris var. mongolica Litv plantation that inoculated with mycorrhizal fungi is smaller than the natural condition. The species diversity of shrub layer in Hippophaer ham-noides and Xanthoceras sorbifolia Bunge plantation that inoculated with AM fungi is smaller than the natural condition. The species diversity of herb layer in Hippophaer hamnoides and Xanthoceras sorbifolia Bunge plantation that inocula- ted with AM fungi is bigger than the natural condition. The perennial herb took over the dominant position in three planted forests. The sites that inoculated with mycorrhizal fungi is on the perennial herb+shrubsstage,while the natural sites is one-year herb+perennial herb+shrubswhich,which is relatively lagged. The comprehensive analysis of the char- acteristics of plant distribution found that the best fitting model of plants is Gauss model. In terms of predictive value accuracy,Heteropappus hispidus (Thunb. ) Less,Cynanchum thesiodes (Freyn). K. Schum,Artemisia scoparia Waldst. et Kit,Melilotus albus Medic. ex Desr,Cynanchum hancockianum ( Maxim. ) Al. Iljinski,Caragana intermedia,Artemis-iaordosica,Caragana intermediaa and Cornus chinensis Wanger are better than others. Inoculated with mycorrhizal fun- gi can increase the frequency and quality of Cynanchum thesiodes ( Freyn ). K. Schum, Heteropappus hispidus (Thunb. ) Less,Cynanchum hancockianum ( Maxim. ) Al. Iljinski,Lespedeza davurica and Caragana intermedia. The frequency and quality of Corispermum declinatum, Cleistogenes squarrosa ( Trin. ) Keng, Sonchus oleraceus L. and Hedysarum scoparium will decrease because of inoculating with mycorrhizal fungi. The study provides an important ba- sis on revealing the ecological self-succession after artificial plantation by micro-reclamation.