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Evaluation of cultural service value of aquaculture pond ecosystem: A case study in a water conservation area of Shanghai. Analysis of natural landscape value change in recent 20 years of Xiangshan Park in Beijing Measuring recreational value and existence value of agricultural land in Shiliuhong leisure farm in Wuhan Anzlyzing about the assessment of the recreational value of the natural spaces in ecotoruism districts:—applying contingent valuation method and travel cost method to analyze the recreational value of Wulingyuan Scenic Resort Natural landscape valuation of Wulingyuan Scenic Area in Zhangjiajie City Application of count models in estimating recreational values of pond aquaculture