森林生态系统服务功能市县联动核算与精度控制

  目的  探讨以市县联动核算体系为手段进行森林生态系统服务功能物质量精度控制的应用方法。  方法  选取浙江省湖州市为研究地，通过设定1个市级总体和5个县级副总体，并依托森林资源连续清查和森林资源规划设计调查体系建立样地核算和小班核算2个体系，形成由同步核算机制、相容机制和修正机制构成的市县联动核算机制，完成森林生态系统水源涵养、土壤保育、固碳、林木养分固持和提供负离子5项指标的物质量核算和精度控制。  结果  在显著性水平a=0.05下，市级总体各指标物质量的样地核算结果估计精度均超过90%；除提供负离子，其他指标物质量的小班核算结果均落入样地核算置信区间。县级副总体中，除长兴县和安吉县的提供负离子，其他指标的小班核算结果均落入样地核算置信区间。采用修正机制，对提供负离子结果予以修正，最后得到2018年湖州市森林生态系统5项服务功能物质量与精度。  结论  市县联动核算体系能够对各层级森林生态系统功能物质量核算结果进行精度控制，可根据小班核算结果是否落入样地核算置信区间来确定区域森林生态系统服务功能物质量最终结果。图1表5参28

City-county synchronized assessing and accuracy control of forest ecosystem services

  Objective  This study is designed to explore the application method of accuracy control of volume of forest ecosystem services (FES) by means of city-county synchronized assessing system.   Method  Huzhou City of Zhejiang Province was selected as the research site. By setting up 1 city-level module (CLM) and 5 county-level sub-modules (CLSM), 2 systems of plot data assessing (PDA) and sub-compartment data assessing (SDA) were established based on the continuous forest inventory and forest management inventory to form a city-county synchronized assessing mechanism composed of synchronous accessing mechanism, compatibility mechanism and correction mechanism, so as to complete the volume calculation and assessing accuracy control of multiple FES indicators (water conservation, soil conservation, carbon sequestration, nutrient retention and negative ions provision).  Result  Under the significance level a=0.05, the accuracy of PDA results of each FES indicators at the city level exceeded 90%. Except for negative ions provision, SDA results of other indicators fell into PDA confidence interval. In county-level sub-modules (a=0.05), except for the negative ions provision in Changxing County and Anji County, SDA results of all other indicators fell into PDA confidence interval. Using the correction mechanism, the results of negative ions provision were corrected, and finally the volume and assessing accuracy of 5 FES in Huzhou City in 2018 were obtained.  Conclusion  The city-county synchronized assessing system can control the accuracy of the quality accounting results of FES at all levels, and the final results of regional FES quality can be determined according to whether SDA results fall into PDA confidence interval. Ch, 1 fig.5 tab. 28 ref.]