Ecological Studies on Establishment and Development of Zoysia japonica STEUD. -Dactylis glomerata L. Association from Cut-over Land of Deciduous Broad-leaved Forest : II. Effect of fertilization on vegetation changes in the pasture established by the oversowing of Z. japonica, D. glomerata and several weed species

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  • 落葉広葉樹伐採跡地におけるシバ・オーチャードグラス型草地の成立過程に関する生態学的研究 : II.シバ(Zoysia japonica STEUD),オーチャードグラス(Dactylis glomerata L.)および数草種を表面播種した混播草地の植生変化に及ぼす施肥の影響
  • 落葉広葉樹伐採跡地におけるシバ・オーチャードグラス型草地の成立過程に関する生態学的研究-2-シバ(Zoysia japonica Steud),オーチャードグラス(Dactylis glomerata L.)および数草種を表面播種した混播草地の植生変化に及ぼす施肥の影響
  • ラクヨウ コウヨウジュ バッサイ アトチ ニ オケル シバ オーチャードグラス

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Abstract

The association of Z. japonica and D. glomerata is useful for a low-input and stable pasture for beef cattle grazing in the mountaneous area of Japan. The methods of the association establishment and management were studied from an ecological view point. Seeds of Z. japonica, D. glomerata and several weed species which generally appeare on a secondary sere in Japan were oversown without tillage on the cutover land of deciduous broad-leaved forest in Sep., 1980. The three different amounts of chemical fertilizers were applied to the treatment plots (the non, low and high fertilized plots) every year. The vegetations in each of three treatment plots were grazed by beef cattle for 5 years. This report presents the effect of fertilization on vegetation changes under the grazing condition. The results obtained are summarized as follows : 1) D. glomerata established well and grew vigorously in the all plots. The dominancy of D. glomerata lasted for 5 years under grazing condition, although it declined slightly in the non fertilized plot in the last year. 2) Z. japonica expanded the plant cover year by year in the non fertilized plot. However, it stopped expanding the cover in the low fertilzed plot, and disappeared in the high fertilized plot in the second year. Thus the favorable association, which had the equilibrium of coveage between Z. japonica and D. glomerata, was constructed only in the non fertilized plot. 3) The sown weed species which occured frequently in the non fertilized plot were Setaria lutecens and Echinochloa Crus-galli in the first year after start of grazing, and Miscanthus sinensis after the second year. These species were capable to use the indicator plants to succeed in the establishment of the favorable association, because their occurences were not evident in the other plots. 4) Both of the stability in vegetational composition and the high diversity in plant species were shown in the low fertilized plot. The importance of this result was emphasized concerning with the possibility to increase the herbage production of Z. japonica -D. glomerata association in the non fertilized plot by the low fertilization.

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