Ulaanbaatar(ウランバートル)市を起点とした調査地域における植物種は39科122属207種であった。優占種はキク科,イネ科,バラ科,アカザ科であった。採草地では多様な植生が認められた北西地域では12科21種の種類が観察された。放牧地では,9科16種の多様な例やイネ科とキク科に偏った2科11種の例など地域によって植生は異なっていた。放棄畑地では,1科1種や2科3~4種から4科11種など放棄後の年数や年次により植生は変化していた。植物種は採食嗜好性の低いキク科やアカザ科が優占種であった。北西地域の放棄畑地においては,2004年の2科6種から2006年の8科14種に変化していたが,家畜放牧に適した草原植生には回復していなかった。北西地域草原の乾物草量(165.44±11.71g/m^2)は南西地域および南東地域に比べ有意に高く(p
maintained or produced by grazing livestock. However, desertification caused by the development for arable land as well as over-grazing has recently become a concern. Therefore, to clarify the present conditions of plant resources in each region around Ulaanbaatar, we studied the relationships among vegetation and standing crop (DM), species, palatability and distances of nomadic movement of livestock. Plant species observed in each region around Ulaanbaatar were 207 species of 122 genera from 39 families. Dominant plant species were Asteraceae and Poacaee. In the northwest region (plot C-1, S), meadows showed diverse vegetation in general, and we could observe 21 species of 12 families. Pasture had a variety of vegetation in each region (plot B-1, C-2, Q, T) including 16 species of 9 families or 11 species of two families biased towards Asteraceae and Poacae. Regarding the abandoned cultivated land (plot B-2, B-3, R), the vegetation varied remarkably from 1 species of 1 family and 3 or 4 species of 2 families to 11 species of 4 families with time and rainfall after abandonment. Asteraceae plant, which has low palatability, was the dominant species in these areas. In the abandoned cultivated land (plot R) in the northwest region, plants of 6 species of 2 families were observed in 2004, and in 2006 14 species of 8 families, but the region had not yet recovered as good pasture for grazing livestock. Standing crops (DM) (165.44±11.71g/m^2) in the northwest region were signicantly greater than in the southwest and southeast regions (p