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Owing to high-cost concerns, contractors dispose the construction spoils predominantly through landfilling or dumping at present. How to motivate them to adopt recycling is a challenge. A novel contingent valuation method named HCVM was proposed in this study. Taking the survey data of 585 construction employees in Changsha City, Hunan Province as a sample, the contractors’willingness to pay (WTP) and their influencing factors were analyzed. The unclear pricing principle of non-recycling disposal charge was clarified, and the incentive mechanism for contractor's construction spoils recycling was proposed accordingly. The results show that: 1) the average WTP of contractors is 73.69 yuan/t, which is higher than the current landfilling charge of 20 yuan/t, and the expected penalty cost for dumping of 16.70~25 yuan/t. It is suggested that the government should increase the landfilling cost over 73.69 yuan/t by pricing or tax, and raising the penalty for dumping from 5000 to 15000 yuan per truck. 2) The average disposal cost for construction spoils recycling is 137 yuan/t, and the average price of recycling products selling is 40 yuan/t. Even if including contractors' WTP, it remains lower than the total recycling cost. The government can address this discrepancy with direct monetary subsidies, rewards developing new technologies to reduce the recycling costs or issuing policies to promote the market demand and selling price of recycling products.3) 74.35% of the respondents were willing to pay for the construction spoils recycling. Factors such as the ownership attribute of contractors, pressure from the public, awareness of environmental protection, and satisfaction with current disposal method positively influence their WTP. However, the respondents' construction project experience negatively affected their WTP. The government's guidance, the higher subsidies, rewards of construction spoils recycling and stricter penalties for dumping can also effectively motivate contractors to adopt recycling behaviour.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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