Studies On Endomycorrhiza And Ectomycorrhiza Of Abies Faxoniana And Betula Albo-sinensis Response To Temperature And CO₂ Concentration And Cultivated Density

This studies is the part of the important project environment-ecology science in west china> the project of interracial cooperation on China-finland and the selected person of Hundred Plan of Chinese Academy of Science. In the condition of simulative domino offect of green house, we studied that endomycorrhiza and ectomycorrhiza of Abies faxoniana and Betula albo-sinensis response to temperature rising,carbon dioxide concentration doubling and cultivated density with growth chamber system and Phillings&Hayman dyeing ,electron microscope technique and paraffin slice up technique. The results showed:1. AMF isn't able to colonize Abies faxoniana; AMF is able to colonize Betula albo-sinensis. The effect of temperature rising and carbon dioxide concentration doubling turns inhibiting action into promoting action to the percentage of vesicle, arbuscule and colonization from summer to autumn. Temperature rising and CO₂ concentration doubling enhances colonization intensity of AMF, but its interact decreases colonization of vesicle and arbuscule. In the late of colonizing, AMF mostly uses the form of vesicle to colonize rootlet of Betula albo-sinensis. Low cultivated density is propitious to form vesicle and arbuscule and to increase colonization of AMF and to enhance colonization intensity. From summer to autumn, the percentage of vesicle, arbuscular and colonization gradually decreases, but temperature rising and carbon dioxide concentration doubling inhibites trend of decreasing and indeed increased its percentage. From summer to autumn, under the condition of temperature rising, colonization intensity changes strong into week, in the condition of carbon dioxide concentration doubling, colonization intensity changes week into strong.2. The change of the ray will affects quantity of Basidiocarp; Temperature rising restrains ectomycorrhizal Basidiocarp of Abies faxoniana and Betula albo-sinensis forming; carbon dioxide concentration doubling advances ectomycorrhizal Basidiocarp of Abies faxoniana and restrains ectomycorrhizal Basidiocarp of Betula albo-sinensis forming. And its interact intensively restrains ectomycorrhizal Basidiocarp forming, too. In the mixed forest of two tree species, quantity of ectomycorrhizal Basidiocarp of Abies faxoniana is in the ascendant for the total. Temperature rising and carbon dioxide concentration doubling don't change the forming time of ectomycorrhizal Basidiocarp. The...