造成された日本シバ草地土壌の経年変化 : 自然生態系と農耕地生態系の土壌学的評価(第1報)

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We investigated the reclaimed Nihon-siba grassland in Kochi, Japan, with respect to geomorphology and duration after reclamation in reference to morphological, physical, chemical, mineralogical and charge properties of the soils. The following is a summary. 1. Grassland reclaimed 11 years ago showed improvement in soil fertility at the surface soil, while the subsoil showed lower fertility close to that of forest soil. However, grassland older than 20 years showed a significant change even in the subsoil. 2. The zero point of charge (ZPC) and σp values of the 11-year grassland soils were close to those of natural forest soils, while for the grassland over 20 years old, the ZPC value was higher and σp value smaller than the 11-year-old grassland. These changes were caused by the neutralization of permanent negative change due to the accumulation of Fe and Al oxides and/or hydroxides transported from the surface horizon by organic acids produced and excreted at the rhizosphere. 3. A "hard pan" layer was formed at the depth of 10 to 15 cm due to continuous tramping by cattle along with the establishment of a root mat layer. These changes occurred over 11 years. Subsequently, an aggregate structure might develop between the root mat and hard pan layers. Thus, the grassland over 20 years old had an excellent drainage system with good aeration. 4. From a pedo-ecological viewpoint, it requires more than 20 years for reclaimed Nihon-siba grasslands to stabilize both pedologically and ecologically and be recognized as a matured grass field, and an 11-year period is insufficient to achieve this stage after reclamation.
社団法人日本土壌肥料学会の論文
1997-10-05

造成された日本シバ草地土壌の経年変化 : 自然生態系と農耕地生態系の土壌学的評価(第1報)

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