| Co-Investigator(Kenkyū-buntansha) |
劉 忠民 中国科学院, 西北水土保持研究所, 高級実験師
〓 厚遠 中国科学院, 西北水土保持研究所, 副研究員
陳 国良 中国科学院, 西北水土保持研究所, 研究員
山 侖 中国科学院, 西北水土保持研究所, 研究員
SUGIMOTO Yukihiro Associate Prof., Arid Land Research, Tottori Univ., 乾燥地研究センター, 助教授 (10243411)
HONGOU Akio Associate Prof., Obihiro Univ.of Agri.and Veterinary Medicine, 畜産学部, 助教授 (30091549)
TAKAHASHI Hidenori Associate Prof., Graduate School of Environmental Earth Sci., Hokkaidou Univ., 大学院地球環境科学研究科, 助教授 (20001472)
INANAGA Shinobu prof., Arid Land Research, Tottori Univ., 乾燥地研究センター, 教授 (40124664)
ICHIZEN Nobumasa prof., Weed Science Center, 雑草科学研究センター, 教授 (50008067)
TAKEDA Kazuyoshi prof., Research Institute for Bioresuurces, Okayama Univ., 資源生物科学研究所, 教授 (90003516)
TAMURA Saburou prof.emeritus, Univ.of Tokyo, 名誉教授 (50011771)
ZHOU Hou Yuan Research Associate Prof., Northwestern Institute of Soil and Water Conservation,
CHEN Gou Liang Research Prof., Northwestern Institute of Soil and Water Cunservation, Academia
SHAN Lun Research Prof., Northwestern Institute of Soil and Water Conservation, Academia
LIU Zhong Min Research Asistant prof., Northwestern Institute of Soil and Water Conservation,
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| Research Abstract |
On the Loess plateau of China, very severe soil erosion and destruction of land resources are occurring, mainly, due to overgrazing and overcultivation. To prevent such a desertification, actions should be applied as : a) introduce herbs, including pasture plants, which can survive and gain high biomass production on steep slopes, b) establish the suitable way of grazing stock management for actual biomass production on the slopes, and c) increase the productivity of the crops on the flatlands and gentle slopes for establishing natural and artificial grassland instead of cultivated land on steeply sloping terrain. The following results concerning a), b) and c) were obtained. Of more than 400 species of herbage collected from other location in China, Japan and abroad were examined, 28 species belonging to 4 families showed good growth under severe conditions of the Loess plareau, without irrigation and manuring. In the pasture sowing Bromus inermis, one of the good species, the plant coverage in the paddock prevented sheep grazing for 3 years was 88%. On the other hand, that in the paddock opened sheep grazing was 32%. Surface water runoff and soil erosion from the not grazed paddock were 46 and 24% of those from the grazed one respectively. Of 717 wheat lines, 387 barley lines and 25 triticale lines collected from Japan and abroad were tested, triticale lines, durum wheat and pilose spring wheat lines showed good growth and yield. It was found that the most important limiting factor for the yield of spring wheat was soil moisture content and keeping it high during jointing stage increased the yield markedly. Deep plowing (30cm depth) during summer season increased moisture content in 60-100cm soil layer. Of three major nutrients, superphoshate caused a remarkable increase in the yield of the spring wheat.
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