Impact of Defoliation Intensity on Net Primary Productivity of <I>Zoysia japonica</I>-dominated Pasture under Grazing Conditions
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概要
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<I>Zoysia japonica </I>Steud. is unique among Japanese native grasses due to its adaptation for grazing and has been re-evaluated by smallholders of beef calf production in Japan, because of its sustainability without any fertilizer. The relationship between stocking density and herbage production is a key factor for the sustainable management of grazing pastures. Moreover, net primary productivity including both above- and below-ground parts is a parameter used to quantify the net carbon absorption rate by living plants. Generally, stocking density levels affect plant production of pastures. Therefore, to determine the impact of defoliation intensity on net primary productivity of a <I>Z. japonica</I>-dominated pasture, the plant mass including below-ground parts was determined for three years under the stocking densities averaging 3.9, 2.7 and 1.6 animal units ha<SUP>-1</SUP> y<SUP>-1</SUP> at the start of the grazing season under set-grazing of beef cattle from June to September. The net primary productivity ranged from 291 to 421 g DM m<SUP>-2</SUP> y<SUP>-1</SUP> for above-ground (ANPP) and from -38 to 51 g DM m<SUP>-2</SUP> y<SUP>-1</SUP> for below-ground parts. The ANPP was found to be affected by defoliation intensity, defined as the ratio of ANPP that was grazed, and attained a maximum when the defoliation intensity was about 40%. As for cattle performance, they maintained their weight during the grazing season below 35% of annual defoliation intensity.
- 独立行政法人 国際農林水産業研究センターの論文
著者
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TAKAHASHI Shigeo
Nasu Campus, National Institute of Livestock and Grassland Science
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Nakagami Koji
Nasu Research Station National Institute Of Livestock And Grassland Science
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Sakanoue Seiichi
Nasu Research Station National Institute Of Livestock And Grassland Science
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TAKAHASHI Shigeo
Nasu Research Station, National Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization (NARO)
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NAKAGAMI Koji
Nasu Research Station, National Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization (NARO)
関連論文
- Soil carbon stock in typical grasslands in Japan
- Soil organic carbon storage in grazing pasture converted from forest on Andosol soil
- Variant of estimation method of aboveground plant biomass in grassland with the gamma model. 2. Proposal of a modified method with visual observation and tests in Zoysia pastures
- Estimation of nitrogen release from decomposing Zoysia japonica litter using its relationship to mass loss
- Impact of Defoliation Intensity on Net Primary Productivity of Zoysia japonica-dominated Pasture under Grazing Conditions