Present Condition of Plant Vegetation and Soil Chemical Properties of Public Grasslands in the North Tohoku Region - Predominance of Kentucky Bluegrass (Poa pratensis L.) in Deteriorated Pastures

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  • KANNO Tsutomu
    National Agricultural Research Center for Tohoku Region:(Present address)Ministry of Agriculture, Forestry and Fisheries, Agriculture, Forestry and Fisheries Research Council Secretariat
  • NASHIKI Mamoru
    National Agricultural Research Center for Tohoku Region
  • HIGASHIYAMA Yumi
    National Agricultural Research Center for Tohoku Region
  • DEGUCHI Shin
    National Agricultural Research Center for Tohoku Region
  • MEGURO Ryohei
    National Agricultural Research Center for Tohoku Region:(Present address)Takizawa, Iwate-gun, Iwate

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Other Title
  • 北東北地域における公共草地の植生及び土壌の現状 : 経年化放牧草地におけるケンタッキーブルーグラスの優占
  • 北東北地域における公共草地の植性及び土壌の現状--経年化放牧草地におけるケンタッキーブルーグラスの優占
  • キタトウホク チイキ ニ オケル コウキョウ ソウチ ノ ショクセイ オヨビ ドジョウ ノ ゲンジョウ ケイネンカ ホウボク ソウチ ニ オケル ケンタッキーブルーグラス ノ ユウセン

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Purposes of this study are to investigate the present status of public grasslands in the north Tohoku region, and to obtain basic information for establishing precise grass-land management for them. Utilization purpose, plant vegetation, soil chemical properties, and forage mineral composition were investigated for 2-4 swards in seven public grasslands. Dominant plant species were orchardgrass (Dactylis glomerata L.), timothy (Phleumpratense L.), and perennial ryegrass (Lolium perenne L.) in the meadows, while Kentucky bluegrass (Poa pratensis L.), orchardgrass, perennial ryegrass, and white clover (Tolifolium repens L.) dominated in the pastures. Average soil pH (H_2O) of the seven public grasslands was 5.15, and it appeared that soil acidification was going on in the public grasslands. However, the content of exchangeable Mg in the soils and Mg content of the forages of the grasslands examined were higher than those in the previous investigations done in 1970^<th> or 1980^<th> -90^<th>. Between the meadows and the pastures, there was no significant difference in soil chemical properties, except for organic nitrogen content in the soils. The Kentucky bluegrass-dominant swards showed lower soil pH, higher soil organic nitrogen content, and higher forage nitrogen content than the swards predominated by the other forage species. Since the Kentucky bluegrass-dominant swards were significantly older than the other swards, litter layer and root mat developed in their soil surface layer. It was considered that the organic matter accumulation on the soil surface layer affected the soil fertility of the Kentucky bluegrass-dominant swards.

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