Influence of Cattle Trampling on Persistence of × Festulolium Braunii Pasture among Different Soil Moisture Conditions

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  • 異なる土壌水分条件における放牧牛の踏圧がフェストロリウム(×Festulolium Braunii)草地の植生に与える影響
  • コトナル ドジョウ スイブン ジョウケン ニ オケル ホウボクギュウ ノ トウアツ ガ フェストロリウム(× Festulolium Braunii)クサチ ノ ショクセイ ニ アタエル エイキョウ

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Abstract

Although the utilization of abandoned paddy fields for cattle grazing is increasing in Japan, grasses introduced into abandoned paddy fields cannot survive long in many cases. Therefore, we established ×Festulolium Braunii pasture under three different soil moisture conditions, i.e. high soil moisture condition (79.7%), middle soil moisture condition (70.9%), and low soil moisture condition (66.1%). Grazing treatment and frequent cutting treatment, which imitated grazing without trampling, was prepared under each condition in order to investigate the influence of cattle trampling on vegetation of ×Festulolium Braunii pasture. Because we assumed that high soil moisture deteriorated the physical soil condition and caused the degradation of pasture by the trampling of grazing cattle, we investigated the soil softness under three different soil moisture conditions. Soil softness in the grazing paddy fields was higher than that of a typical pasture. Moreover, it rose as the soil moisture increased. Under grazing, the coverage of ×Festulolium Braunii decreased and bare land area increased rapidly compared with cutting : Especially in the highest soil moisture condition, the area of bare land increased remarkably. Our studies suggested that the trampling of grazing cattle severely damaged the population of ×Festulolium Braunil in a grazing paddy field.

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