草原固碳量估算方法及其敏感性分析

doi:10.3773/j.issn.1005-264x.2008.04.009

摘要/Abstract

摘要：

通过提高草地管理水平来增加草地生态系统的碳储量, 是一种低成本的固碳减排途径。固碳量的确定是固碳成本估算中的重要组成部分, 目前国际上通用的草地固碳量估算方法有两种: 碳储量变化法和碳通量法。该文以禁牧为固碳措施, 通过敏感性分析讨论了这两种方法对草原固碳成本估算的适宜性。结论得出: 在一定牧压强度范围和一定面积研究区内, 固碳成本与牧压强度成线性增长关系, 与研究区面积成非线性关系, 表现出“饱和增长”的趋势; 与碳通量法相比, 碳储量变化法对牧压强度和研究区面积都较不敏感。造成这种差异的主要原因是不同方法选取的研究区及其放牧强度背景不同。从草地生态系统过程看, 碳储量变化法与碳通量法在本质上是一致的, 二者都较适于草原禁牧措施下的固碳量和固碳成本的估算, 可根据获取数据类型的不同而采用不同的方法。

关键词: 碳储量变化法, 碳通量法, 禁牧措施, 固碳成本, 羊草草原

Abstract:

Aims Improved rangeland management activities, such as prohibiting grazing, contribute significantly to increased carbon storage in grassland at low cost. Estimating carbon sequestration is important to evaluating cost and potential of carbon sequestration in grassland. We described and compared two methods for estimating carbon sequestration, stock-difference and gain-loss, in order to assess their suitability and accuracy for estimating cost of carbon sequestration in grassland.

Methods Using the grassland in Xilin River Basin of Inner Mongolia as a case study, we estimated the amount and cost of carbon sequestration by the stock-difference and gain-loss methods and compared results through sensitivity analysis.

Important findings There are significant differences in the amount and cost of carbon sequestration between the two methods, because of different grazing intensities. The cost of carbon sequestration is a function of grazing intensity and size of study area, with a linear relationship between cost and grazing intensity and a nonlinear relationship between cost and size of study area. The gain-loss method is more sensitive to grazing intensity and size of study area. The stock-difference method is more accurate and suitable for estimating cost of grassland carbon sequestration. However, the main reason for the difference between the two methods is different conditions of study areas. The two methods are essentially the same with regard to grassland succession. With sufficient data, both methods to estimate the amount and cost of carbon sequestration in grassland will give similar results.

Key words: Stock-difference method, Gain-loss method, prohibited grazing, cost of carbon-sequestration, Leymus chinensisgrassland

常瑞英, 唐海萍. 草原固碳量估算方法及其敏感性分析. 植物生态学报, 2008, 32(4): 810-814. DOI: 10.3773/j.issn.1005-264x.2008.04.009

CHANG Rui-Ying, TANG Hai-Ping. SENSITIVITY ANALYSIS ON METHODS OF ESTIMATING CARBON SEQUESTRATION IN GRASSLAND ECOSYSTEM OF INNER MONGOLIA, CHINA. Chinese Journal of Plant Ecology, 2008, 32(4): 810-814. DOI: 10.3773/j.issn.1005-264x.2008.04.009

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链接本文: https://www.plant-ecology.com/CN/10.3773/j.issn.1005-264x.2008.04.009

https://www.plant-ecology.com/CN/Y2008/V32/I4/810

图/表 4

参考文献 14

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固碳量估算方法 Methods	研究区 Study area	土壤碳储量* Soil carbon storage (kg C·hm^-2)(0~100 cm)	碳通量** Carbon flux (kg C·hm^-2·a^-1)	取样时间 Time	放牧状况 Grazing condition	引用文献 References
碳储量变化法Stock-difference method	退化样地围栏内 Nongrazed exclosure plot	539 084.8	—	1989	禁牧6年 Grazing excluded for 6 years	吕贻忠等, 1992
碳储量变化法Stock-difference method	退化样地围栏外 Heavy grazed plot	501 492.4	—	1989	过度放牧 Heavy grazing	吕贻忠等, 1992
碳通量法Gain-loss method	羊草样地 Aneurolepidium chinese sample plot (ACSP)	—	269.0	1998 and 1999	禁牧20年 Grazing excluded for 20 years	Li et al., 2002
碳通量法Gain-loss method	放牧样地 Moderated grazed plot	—	-106.0	1998 and 1999	中等强度放牧 Moderated grazing	李凌浩等, 2004

固碳量估算方法 Methods	研究区 Study area	土壤碳储量* Soil carbon storage (kg C·hm^-2)(0~100 cm)	碳通量** Carbon flux (kg C·hm^-2·a^-1)	取样时间 Time	放牧状况 Grazing condition	引用文献 References
碳储量变化法Stock-difference method	退化样地围栏内 Nongrazed exclosure plot	539 084.8	—	1989	禁牧6年 Grazing excluded for 6 years	吕贻忠等, 1992
碳储量变化法Stock-difference method	退化样地围栏外 Heavy grazed plot	501 492.4	—	1989	过度放牧 Heavy grazing	吕贻忠等, 1992
碳通量法Gain-loss method	羊草样地 Aneurolepidium chinese sample plot (ACSP)	—	269.0	1998 and 1999	禁牧20年 Grazing excluded for 20 years	Li et al., 2002
碳通量法Gain-loss method	放牧样地 Moderated grazed plot	—	-106.0	1998 and 1999	中等强度放牧 Moderated grazing	李凌浩等, 2004

结论 Conclusions 方法 Methods	固碳量(△C) Amount of carbon (Mg C)	总固碳成本(C_T) Total cost (元, RMB)	固碳成本(Cs) Cost (RMB·Mg^-1 C)
碳储量变化法 Stock-difference method	1879.6	105 750.0	56.3
碳通量法 Gain-loss method	375.0	55 000.0	146.7

结论 Conclusions 方法 Methods	固碳量(△C) Amount of carbon (Mg C)	总固碳成本(C_T) Total cost (元, RMB)	固碳成本(Cs) Cost (RMB·Mg^-1 C)
碳储量变化法 Stock-difference method	1879.6	105 750.0	56.3
碳通量法 Gain-loss method	375.0	55 000.0	146.7