Annual net primary production and efficiency of solar energy utilization in three double-cropping agro-ecosystems in Japan

Hiroshi Koizumi*, Youzou Usami, Mitsumasa Satoh

*この研究の対応する著者

研究成果: Article査読

6 被引用数 (Scopus)

抄録

Annual net production and utilization efficiency of solar energy conversion were studied in three double-cropping agro-ecosystems: upland rice-barley (R-B), peanut-wheat (P-W) and dentcorn-Italian ryegrass (C-I). The investigations were carried out in upland fields in Ibaraki Prefecture, central Japan, from June 1985 to May 1988. The average annual global solar radiation (GSR) recorded was 44-55 × 102 MJ m-2 during the 3 years. Annual net primary production was 24.4-25.3 MJ m-2 for the food crops (R-B, P-W) and 53.3 MJ m-2 for the forage crop (C-I), which was equivalent to 0.54 (R-B), 0.50 (P-W) and 1.20% (C-I) of GSR for the year including the fallow period. Of the total net energy fixed by the crops, ∼ 90% was harvested materials (H). The rest comprised litter (L), stubble and roots (SR), which may be utilized later after decomposition by soil microorganisms. Dry matter production for every 1.0 MJ of GSR absorbed is ∼ 1.0g dry matter for peanut, 1.3-1.5 g for cereal crops (R, B and W) and 2.0-2.3 g for forage crops (C and I). The annual net production and the efficiency of solar energy utilization were compared with various types of terrestrial ecosystems. Fertile, double-cropping fields in Japan were comparable to or higher in net production than a forest ecosystem.

本文言語English
ページ(範囲)241-255
ページ数15
ジャーナルAgriculture, Ecosystems and Environment
32
3-4
DOI
出版ステータスPublished - 1990
外部発表はい

ASJC Scopus subject areas

  • 農業および作物学
  • 生態、進化、行動および分類学
  • 生態学
  • 地球惑星科学(全般)
  • 環境科学(全般)

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