摘要
利用CASA模型测算净初级生产力(NPP),在碳循环过程模型的基础上估算2000—2017年秦巴山区土壤有机碳储量,使用净现值(NPV)法估算出2015年、2017年土壤有机碳的经济价值,并分析不同土地利用形式下土壤碳价值的差异性。结果表明:在时间尺度上,秦巴山区植被NPP呈现先增加、后减少的趋势,2015年植被NPP均值达到峰值;在空间尺度上,秦巴山区植被NPP呈现中间高、四周低,山区高于平原的整体趋势。土壤有机碳含量受植被净初级生产力和土壤矿质化强度的影响,空间分布呈现西北高、东南低的格局,高值区主要集中在秦岭山脉中段和大巴山区部分区域。采用净现值法估算秦巴山区2015年、2017年不同情景下土壤有机碳的价值量发现:在不同碳价和贴现率情形下,有机碳的价值量有很大差异,并且贴现率和碳价越高,价值量就越高;在不同土地利用形式下,单位面积价值量和价值总量也会不同,林地、草地的总价值量较高,而未利用地的单位面积价值量较高。将贴现率和碳价纳入到土壤有机碳价值量的估算中,不仅更切合实际情况,而且可在一定程度上为政府设置合理碳价提供理论依据。
The CASA model was used to calculate the net primary production(NPP).Based on the carbon cycle process model,the soil organic carbon storage in Qinling-Daba Mountain area was estimated from 2000 to 2017,and the net present value(NPV)method was used to estimate the economic value of soil organic carbon in 2015 and 2017,and the differences in soil carbon values under different land use forms were analyzed.The results indicated that on the time scale,the NPP of vegetation in Qinling-Daba Mountain area showed a trend of increasing firstly and then decreasing.The average NPP value of vegetation reached its peak in 2015.On the spatial scale,the NPP of vegetation in Qinling-Daba Mountain area was different in space.The overall trend of high in the middle and low on all sides,mountain area higher than plain is presented.The spatial distribution of[HJ2.2mm]soil organic carbon content is affected by the net primary productivity of vegetation and the mineralization intensity of soil.In the pattern of low southeast,the high value area is mainly concentrated in the middle part of the Qinling Mountains and parts of the Daba Mountain area.The net present value method is used to estimate the value of soil organic carbon in different scenarios of Qinling-Daba Mountain area in 2015 and 2017.Under different carbon prices and discount rates,the value of organic carbon varies greatly,and the higher the discount rate and carbon price,the higher the value.The value per unit area under different land use types was also obtained.The total value of the forest and grassland is higher,and the value of the unit area of the unused land is higher.Incorporating the discount rate and carbon price into the estimation of the value of soil organic carbon can be more realistic,and also provides a certain theoretical basis for the government to set a reasonable carbon price.
作者
余玉洋
李晶
曾莉
YU Yuyang;LI Jing;ZENG Li(School of Geography and Tourism,Shaanxi Normal University,Xi′an 710119,Shaanxi,China)
出处
《陕西师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第1期11-20,共10页
Journal of Shaanxi Normal University：Natural Science Edition
基金
国家自然科学基金(41771198,41771576)
国家科技基础资源调查专项(2017FY100905)
