Study On Distribution And Anatomical Structure Of Ambrosia Artemisiifolia L. And Ambrosia Triifda L. In Jilin Province

Ambrosia artemisiifolia L. and Ambrosia trifida L. was typical annual, short-day, hi-lightplant of Ambrosia in Compositae; which had characteristics such as cold and droughtresistance, poor soil-resistance, pest resistance. Both of them were scattered all over theworld, China also had a wide distribution area of them, which brought great harm. Therefore,scholars come to emphasis on the Ambrosia artemisiifolia L. and Ambrosia trifida L.increasingly in recent years.This paper concentrated on the distribution of both ragweed in the Jilin province, andstudied on use of observation, description and comparison by using the method of paraffinsectioning of its vegetative organs root, stem and leaf morphology and anatomy. The resultsshowed that:Ambrosia artemisiifolia L. distributed more widely than Ambrosia trifida L. in the Jilinprovince. Because the Ambrosia artemisiifolia L. more vital and adaptable than Ambrosiatrifida L. on some areas between those cities, like Tongyu train road, both sides of thehighway of Songyuan, the both sides of highway of Jiaohe had relative fewer distributions,probably due to no invasion time. The Ambrosia artemisiifolia L. and Ambrosia trifida L. hadnot been found on the grassland or meadow of Eastern Mountain of Jilin Province and westof the Songliao Plain. It was possible that Ambrosia artemisiifolia L. and Ambrosia trifida L.were hi-light, intolerant of low-light, can not growth and development normally in the canopydensity of the undergrowth. On the grasslands, they cannot win against roots huge,deep-rooted perennial grasses of plants.The leaves of Ambrosia artemisiifolia L. and Ambrosia trifida L. was dorsi—ventraltype. The surface of leaves had cuticle and a lot of white trichomes; they all had a "rosettestructure". Ambrosia artemisiifolia L. palisade tissue/spongy tissue was1.4:1, Ambrosiatrifida L. palisade tissue/spongy tissue was1.2:1.The stem of Ambrosia artemisiifolia L. andAmbrosia trifida L. had contain fully developed marrow, Ambrosia artemisiifolia L. occupysthe3/5area of stem cross-section and Ambrosia trifida L. almost comes to2/5, both themhave developed stem vascular bundles. The casparian band of primary root structures ofAmbrosia artemisiifolia L. was not clear in the eortex, while the Ambrosia trifida L.’s wasclear. The adventitious root of Ambrosia artemisiifolia L. was hexach, and Ambrosia trifida L.was heptareh prototype. The primary xylem of them were exarch, and the under-developedmarrow was located in the central. Although the basic structure of the stems and roots ofAmbrosia artemisiifolia L. and Ambrosia trifida L. were similar, there were some differencesbetween them. Roots and stems of xylem vessels were developed, they can transport water, conduct the function of mechanical support function and food’s storage. The averagediameters of vessel in the root of Ambrosia artemisiifolia L. were large than that of Ambrosiatrifida L.’s. Both of their vessel’s average diameters in their roots were bigger than that ofstems, so it will help them to obtain enough water from the surrounding soil to meet the needsof the aerial parts, and enhance the ability to obtain water, increase drought resistance. Theleaves and stems of both them contain crystal. The roots, stems, leaves of Ambrosiaartemisiifolia L. and Ambrosia trifida L. have secretory structures. Ambrosia artemisiifolia L.palisade tissue/spongy tissue was bigger（1.4>1.2）. This also demonstrated that Ambrosiaartemisiifolia L. was more drought-tolerant, and its leaves use light energy more efficiently.The spongy tissue of Ambrosia artemisiifolia L. and Ambrosia trifida L. was different. Thespongy tissue of Ambrosia artemisiifolia L. was more developed, invade to both sides of mainvein, while Ambrosia trifida L. was the opposite.