Study On Parasitic Parasitism Of Siberian Mountain And Its Relationship With Host Plant Quercus Liaotungensis

Loranthus tanakae is a deciduous shrub belongs to Loranthus, Loranthaceae, mostly colonizes species of the family Fagaceae plants. Quercus wutaishanica and Pinus tabuliformis, as the dominant and constructive species in areas of Loess Plateau, also is the main host plants of L. tanakae in this study, but we did not find P. tabuliformis individual infected. The objective of this work was to investigate population growth, spatial distribution and spatial association of the population of L. tanakae and host plant Q. wutaishanica, un-host plant P. tabuliformis, also parasitic behavior of L. tanakae was studied.The results showed that (1) the sampled851Q. wutaishanica individuals were found that358individuals (42.1%of the sample population) were infected, the number of L. tanakae individuals per host plant ranged between1and20, the un-host plant137P. tabuliformis individuals were found that none was infected.(2) A clumped pattern of spatial distribution was observed on Q. wutaishanica in0～60m scale and a random pattern of spatial distribution in≥60m scale, and L. tanakae showed a clumped pattern of spatial distribution in0～100m scale. P. tabuliformis, observed a clumped pattern of spatial distribution in0～20m scale and a uniform pattern of spatial distribution in20～100m scale.(3) The comparisons showed anegative relevance between Q.wutaishanic and P. tabulaeformis in0～60m scale, positive relevance in60～85m scale, and no horizontal relevance in85～100m scale. And there are the same trend between L. tanakae and P. tabulaefor, un-infected Q.wutaishanic and P. tabulaefor. That is, they all showed a negative correlation in a certain scale, and then a positive relevance and no horizontal relevance in upper scale. The P. tabulaefor play a protective role on the Q.wutaishanic, maybe it will hinder the diffusion of L. tanakae populations to the host plant. The positive spatial relevance is good for the seed propagation of L. tanakae with scale(0～60m).(4) With increasing altitude plots and the number of Q.wutaishanic, the infection of Q.wutaishanic, seed setting rate andsurvival rate of L. tanakae is also increasing.(5) The Pearson correlation test showed that there is between the parasitic height and the integral parasitic branches have a significant relationship to the seed rate and survival rate of L. tanakae; As time continues, the damage to the host plant Q.wutaishanic is also greater.(6) Q.wutaishanic and L. tanakae are in a relatively stable community successional stages,and there are964L. tanakae growing on the1/2top height of Q. wutaishanica, and the relationship between haustorium size of the hemiparasite and circumference of the infested branch was highly significant (P＜0.01).(7) The Q. wutaishanica most infested with L. tanakae were those reaching greater heights and with larger crowns, with preferred grip height being the uppermost portions of host plants.