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Bamboo vs. crops: An integrated emergy and economic evaluation of using bamboo to replace crops in south Sichuan Province, China
Citation:
Lu, H., C. Cai, X. Zeng, Dan Campbell, S. Fan, AND G. Liu. Bamboo vs. crops: An integrated emergy and economic evaluation of using bamboo to replace crops in south Sichuan Province, China. JOURNAL OF CLEANER PRODUCTION. Elsevier Science Ltd, New York, NY, 177:464-473, (2018).
Impact/Purpose:
The purpose of this study was to evaluate the ecological and economic costs and benefits of planting bamboo to replace crops on sloping land in Chang-ning County, Sichuan Province, China. The government is subsidizing the replacement of crops on sloping land in this region for conservation purposes as part of the “Grain for Green Program” GRFG. The study showed that substituting bamboo for crops resulted in substantial benefits in the form of water conservation and in controlling soil erosion, which were documented through an emergy analysis and expressed in Emyuan, a combined emergy-money unit. These documented benefits were compared to the government mandated subsidy given to farmer’s for planting bamboo as an independent and objective way to assess the appropriate level of benefits to be paid. However, the economic benefits gained from planting bamboo were much lower than those gained from crops during the first 3 to 8 years after planting. The authors recommend planting edible fungi and medicinal herbs as intercrops during the early years after conversion of cropland to bamboo to enhance its economic viability before the bamboo reaches harvestable age.
Description:
Based on long-term monitoring conducted in Chang-ning county, a pilot site of the ‘Grain for Green Program’ (GFGP), an integrated emergy and economic method was applied to evaluate the dynamic ecological-economic performance of 3 kinds of bamboo systems planted on sloping farmland. The results confirmed the positive effects of all 3 kinds of bamboo systems on water conservation and soil erosion control. The benefits gained progressively increased during the first 8 years after conversion, going from 4639 to 16127 EMyuan/ha/yr on average. All three bamboo plantations were much more sustainable than common sloping cropland (CP) at both the short and long-term scales with their Emergy Sustainability Index (ESI) and Emergy Index for Sustainable Development (EISD), respectively, being 14.07-325.71 and 80.35-265.80 times that of CP. However, all three bamboo plantations had a Net Economic Benefit (NEB) less than that of CP during the first 8 years after conversion. Even with the government mandated ecological compensation applied, the annual NEBEC of the Bambusa rigida (BR) and Phyllostachys pubescense (PP) plantations was, respectively, 3922.03 and 7422.77yuan/ha/yr lower than the NEB of CP. Emergy-based evaluation of ecosystem services provides an objective reference for applying ecological compensation in strategy making, but it cannot wholly solve the economic viability problem faced by all bamboo plantations. Inter-planting annual herbs or edible fungus, such as Dictyophora echinovolvata, within bamboo forests, especially in young bamboo plantations, might be a direction for optimizing bamboo cultivation that would improve its economic viability.
