Abstract:

Valuating ecosystem services is important to the public and decision makers as well as scientists.Investigations of the value of agricultural ecosystems have focused mainly on value food and neglected the value of regulation services,supporting services and cultural services of an ecosystem.Gas regulation service,a kind of regulation service of a pond aquaculture ecosystem,is calculated in this paper.Through Chlorophyll a measured in an aquaculture pond each season,the primary production of the aquaculture pond is calculated,and then the value of gas regulation service of common fish pond aquaculture ecosystem is estimated by using the price of industrial O2,the Sweden carbon tax and the cost of forestation.The result of the study shows that the total value of gas regulation service of pond aquaculture ecosystem is about 63 42248 yuan/a〖DK1〗·hm2.Considering the value loss of oxygen consumption and the release of carboncontaining gas,the total net value of gas regulation service of pond aquaculture is about 28 886.74 yuan/a〖DK1〗·hm2,including the value of carbon fixation,which is about 25 46328 yuan/a〖DK1〗·hm2,the value of O2 emission is about 3 42346 yuan/a〖DK1〗·hm2.The value of gas regulation service of pond aquaculture is above half of market value of fish production in the pond,which is about 44 022.1 yuan/a〖DK1〗·hm2.It is concluded that the contribution of aquaculture to society and economy is underestimated in view of the ecosystem service of aquaculture.The result of this study shows that the value of the gas regulation service of pond aquaculture is more than that of the farming in other research;this may be resulted from the rapid growth rate of algae.Though many methods have been used to evaluate the gas regulation service of agriculture,the method through Chlorophyll a may be an effective method to value gas regulation service in pond aquaculture.

Key words: aquaculture/ecosystem service/valuation/gas regulation