Intending to clear up scope of carrying capacity of lawns, it is recorded, at first, that result brought about some experimental investigation on relation ship of soil hardness owing to trampling, as follows.
(1) The experimental results which were obtained in the way described above are summerized in Fig.13.
(2) Floristic composition of lawns is influenced by the extent of soil hardness owing to frequency of trampling.
(3) Principal kind of pastures and wild grasses composed mix lawns were found to be limited a species.
There grasses are as follows:
Zoysia japonica Steud, Zoysia matrella Merr, Trifolium repens L., Poa pratensis L., Poa annua L., Platago asiatica L., Eleusine indica Gaerth, Digitaria genus and Eragrosis ferruginea P. Beau V. It showed results appoximately similar to those of other studies.
(4) Principal kind of pastures and wild grasses are stronger at trampling resistant properties are ordered as follows:
Eleusine indica Gaerth>Digitaria genus>Zoysia japonica Steud Zoysia matrella Merr>Platago asiatica L≅aEragrostis ferruginea P. Beau V. >Poa pratensis L.≅Poa annua L≅Trifolium repens L.
The order is guessed more physical trampling resistant properties than ecological resistance. It close agreement between observed and experimented values was obtained.
(5) The stronger corelation was observed between trampling and soil hardness (a coefficient of correlation 0.899).
(6) Zoysia genus become bare by trampling the method of trading on barley plants 15th of every day. Other kind of pastures and wild grasses become bare less than trampling 15th of every day except Eleusine indica Gaerth. and Digitaria genus. It seems that Eleusine indica Gaerth. and Digitaria genus invade bare ground as suplementary phenomena.
(7) All kind of pastures and wild grasses composed lawns become bare limit of soil hardness is 27mm indicative graduations of Yamanaka's soil hardness meter, and become bare ground completely is more than 29mm indicative graduations.
(8) The state of growth of Zoysia genus do not become bare but canopy is less than 25mm indicative graduations of Yamanaka's soil hardness Meter. Good growing conditions of Zoysia genus is less than 23mm indicative graduations.
(9) The limits of carrying capacity of lawns is expressed from the result of this study with some values are as follows, the number of times of trampling is 15th of every day, soil hardness is 27mm indicative graduations of Yamanaka's soil hardness Meter, ground contact pressure is 6.0kg/cm
2. A proper carrying capacity are as follows, the number of times of trampling is 7th of every day, soil hardness is 23mm indicative graduations, ground contact pressure is 2.8kg/cm
2.
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