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[G-1.1 Land Evaluation of Prevention and Remedies for Desertification]

[Contact Person]

Toshiaki IMAGAWA
Head of Laboratory of Land Evaluation
Department of Environmental Management
National Institute of Agro-Environmental Sciences
Ministry of Agriculture, Forestry, and Fisheries
3-1-1 Kannondai, Tsukuba, Ibaraki 305-8604, Japan
Tel:+81-298-38-8277 Fax:+81-298-38-8199
E-mail:imagawa@niaes.affrc.go.jp

[Total Budget for FY1995-FY1997]

45,315,000 Yen (FY1997;14,579,000 Yen)

[Abstract]

To evaluate the effects of measures to prevent and reverse desertification with respect to natural environmental and socioeconomic conditions, we conducted a field survey in Naiman, Inner Mongolian Autonomous Region, with the following results: 1) Three types of soil were broken down into 5 subtypes based on physicochemical properties. Naiman vegetation was also classified into main 3 types corresponding to these soil types. 2) The optimal stocking rate in the surveyed region is about 4 sheep per hectare. Because continuous grazing eventually adversely affects grassland vegetation, rotation is advisable in sustainable grazing management. 3) The high correlation between red-band reflectance of Landsat TM (TM3) and measured biomass enabled us to estimate grassland biomass and to determine most districts in northern to central Naiman were overgrazed. 4) Nitrogen fertilizer is improves biomass production in this grassland most effectively. 5) After investigating a local farming system to reduce grazing intensity and restore grassland productivity in !! two villages, we confirmed that overgrazing could be remedied without reducing the present number of livestock with bare feeding. 6) Desertification and its prevention and recovery depend on natural environmental and socioeconomic conditions.

[Key Words]

China, Desertification, Preventive Technology, Grazing Intensity, Land Use