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Young-Nam Kim,Nicholas Dickinson,Keum-Ah Lee,Yong Bok Lee 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Conversion of lowland New Zealand to agriculture has declined biodiversity of native earthworms. It has been well known that introduced earthworms improve soil fertility and crops yield in the NZ agricultural system, but there is lack knowledge about functional roles of native species in the agricultural soils. The present study was conducted to compare the burrowing effects of native and exotic earthworms on soil biological and chemical properties as well as pasture production in different soil types including native forest (NF), sheep farmland (SF), and dairy farmland (DF) through a pot experiment. During the incubation period, the native species Maoridrilus transalpinus represented low mortality (<10 %) in all soil types, but the invasive species Octolasion cyaneum did not survive in NF soil. Root structure also appeared to be better in the presence of native species than exotic species and control with no earthworms. In addition, M. transalpinus considerably improved soil biogeochemical properties and ryegrass yields compared to O. cyaneum. These improvements by the native species included increase in availability of key nutrients (N and P) in the rhizosphere and also greater plant biomass and photosynthetic pigments. Moreover, the rhizosphere, particularly of DF soil, had greatly stimulated microbial abundance and activity by the presence of M. transalpinus, with double increases of microbial biomass C and dehydrogenase enzyme activity, compared to the control. These results suggest that, like Lumbricids, this native species of earthworm is likely to play functional roles in the NZ pasture lands, leading to improvement of soil fertility and crop productivity.