Summary of Research Project Results under JSPS FY2002
"Research for the Future Program"

1.Research Institution Hokkaido University
2.Research Area Integrated Fields
3.Research Field Environmental Conservation in the Asian Region
4.Term of Project FY 1998 ` FY 2002
5.Project Number 98I00601
6.Title of Project The Comprehensive Development of Ecosystem-Reconstruction and Sustainable Biological Production in the Southwestern China

7.Project Leader
Name Institution,Department Title of Position
Katsuhiko, Demura Hokkaido University, Graduate School of Agriculture Professor

8.Core Members

Name Institution,Department Title of Position
Yutaka, Ishii Hokkaido University, Graduate School of Agriculture Professor
Tadao, Ando Hiroshima University, Faculty of Applied Biological Science Professor
Hisayoshi, Yagi Mie University, Faculty of Bioresources Professor

9.Summary of Research Results

  Project PurposeFThis project was carried out in the Karst mountainous area (Qibainong) in southwest China. The purpose of the project was to discover co-existence principle of the natural ecosystem and human activity in Qibainong, where forest degradation is severe, and the forest ecosystem has low self-recovery power. Furthermore, the study shows an Asian model based on a new co-existence principle that encourages both natural ecosystems and sustainable human activity, by restructuring damaged forest ecosystems and by raising the productivity of cultivated land.
  ResultsFThe weather condition of the monsoon climate (concentrically much rain in the rainy season) in Qibainong area has brought a linkage of (S, N) and a solution of limestone. This has contributed to global warming caused CO2, and also has brought nutrients and water supply, which has an influence on forest biomass and food production. Human activity and a population growth have placed a burden on the forest. If one tries to sustain the ecosystem function, food production capacity is controlled and it becomes difficult to improve the vicious circle of environmental degradation and poverty. Especially, the increased amount of chemical fertilizer from outside will raise the nitrogen loading and bring pollution. The relationship between a rise in food production of animals and plants and nitrogen loading, a forest function's relation, the relation of the cyclic function of biomass supply, water, energy, and nourishment was understood.
  Though nutritive substance in the soil is limited, by making good use of biomass cycling in the system, which made it possible for the closed system community to have human survival for such a long time. However, there is a pollution problem in the nitrogen cycling. The forest ecosystem function such as the lignum resources supply function, head water conservation function (especially a stable supply of near water), soil erosion control, nutritive supply from forest land to arable low land, conservation of biodiversity have been proved.
  "Carrying Capacity" (CC) is a notion of showing a permissible maximum which can be held in the global ecosystem. The relationship between the amount of biomass supply in the global ecosystem and the consumption amount of resources by human activities has to be balanced on the consideration of sustainable human activities. The EF analysis was carried out in (Nongshitun community ) in the Qibainong area and the human carrying capacity was estimated.

10.Key Words
(1)Karst-Doline   (2)Dahuaxian Qibainong (xiang)   (3)Functions of forest ecosystem
(4)Forest biomass   (5)Vegetation change   (6)Material recycling
(7)Nitrogen cycling   (8)Sustainable biomass production   (9)Carrying Capacity