内蒙古草地生态系统碳源/汇时空格局及其与气候因子的关系

doi:10.11821/dlxb201601002

地理学报 ›› 2016, Vol. 71 ›› Issue (1): 21-34.doi: 10.11821/dlxb201601002

内蒙古草地生态系统碳源/汇时空格局及其与气候因子的关系

戴尔阜^1,²(), 黄宇³, 吴卓^1,^2,⁴, 赵东升^1,²

1. 中国科学院地理科学与资源研究所,北京 100101
2. 中国科学院陆地表层格局与模拟重点实验室,北京 100101
3. 滑铁卢大学环境学院规划学院,加拿大滑铁卢 ON N2L 3G1
4. 中国科学院大学,北京 100049

收稿日期:2015-06-23 修回日期:2015-10-18 出版日期:2016-01-31 发布日期:2016-01-15
作者简介:
作者简介:戴尔阜(1972-), 男, 博士, 研究员, 博士生导师, 中国地理学会会员(S110004569M), 主要研究方向为土地利用和气候变化对生态系统影响.E-mail:
基金资助:
国家重点基础研究发展计划(973项目) (2015CB452702, 2012CB416906);国家自然科学基金项目(41571098, 41371196);国家科技支撑计划(2013BAC03B04)

Spatial-temporal features of carbon source-sink and its relationship with climate factors in Inner Mongolia grassland ecosystem

DAI Erfu^1,²(), HUANG Yu³, WU Zhuo^1,^2,⁴, ZHAO Dongsheng^1,²

1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
2. Key Laboratory of Land Surface Pattern and Simulation, CAS, Beijing 100101, China
3. School of Planning, Faculty of Environment, University of Waterloo, Waterloo ON N2L 3G1, Canada
4. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2015-06-23 Revised:2015-10-18 Published:2016-01-31 Online:2016-01-15
Supported by:
National Basic Research Program of China (973 Program), No.2015CB452702, No.2012CB416906;National Natural Science Foundation of China, No.41571098, No.41371196;National Key Technology R&D Program, No.2013BAC03B04

摘要/Abstract

摘要：

草地净生态系统生产力(NEP)能够表征草地生态系统的固碳能力,直接定性定量地描述草地生态系统的碳源/汇性质和大小.因此,研究区域尺度草地生态系统NEP具有重要的实践意义.基于卫星遥感资料,地面气象观测资料及实地采样数据,结合光能利用率模型估算了2001-2012年内蒙古草地生态系统净初级生产力(NPP).同时,应用土壤呼吸模型估算了逐月平均土壤呼吸量(Rs),进而估算内蒙古草地净生态系统生产力(NEP).研究揭示了2001-2012年内蒙古草地生态系统NPP,NEP年际变化规律,气候因子的年际变化规律,以及草地NPP,NEP与主要气候因子的关系.结果表明:2001年以来,内蒙古草地生态系统整体发挥碳汇效应,净碳汇总量达到0.55 Pg C,年均固碳率约为0.046 Pg C/a;研究区大部分草地NPP,NEP与降水均呈正相关关系,与温度相关性不显著,内蒙古草地生态系统仍有巨大的固碳潜力.

关键词: 草地生态系统, NPP, NEP, 碳源/碳汇, 内蒙古

Abstract:

In this paper, field sampling data, remote sensing data, and ground meteorological observation data were used to estimate the net primary productivity (NPP) in the grassland ecosystem in Inner Mongolia from 2001 to 2012 based on a light use efficiency model. The spatiotemporal distribution of the NEP in the Inner Mongolia grassland ecosystem was then analyzed by estimation of the NPP and soil respiration from 2001 to 2012. This paper also investigated the response of the NPP and NEP to main climatic variables on the spatial and temporal scales from 2001 to 2012. Results showed that most of the grassland area in Inner Mongolia has functioned as a carbon sink since 2001 and that the annual carbon sequestration rate amounts to 0.046 Pg C·yr^-1. The total net carbon sink of the Inner Mongolia grassland ecosystem over the 12-year period reached 0.557 Pg C. The carbon sink area accounted for 60.28% of the total grassland area and sequestered 0.692 Pg C, whereas the C source area accounted for 39.72% of the total grassland area and released 0.135 Pg C. The NPP and NEP of the Inner Mongolia grassland ecosystem have more significant correlations with precipitation than with temperature, and the Inner Mongolia grassland ecosystem has great potential for carbon sequestration.

Key words: grassland ecosystem, NPP, NEP, carbon source-sink, Inner Mongolia

戴尔阜, 黄宇, 吴卓, 赵东升. 内蒙古草地生态系统碳源/汇时空格局及其与气候因子的关系[J]. 地理学报, 2016, 71(1): 21-34.

DAI Erfu,HUANG Yu,WU Zhuo,ZHAO Dongsheng. Spatial-temporal features of carbon source-sink and its relationship with climate factors in Inner Mongolia grassland ecosystem[J]. Acta Geographica Sinica, 2016, 71(1): 21-34.

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参考文献 39

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温度带	干湿区	自然区	主要植被
I 寒温带	A(湿润区)	IA1 大兴安岭北段山地落叶针叶林区	针叶林,湿地
II 中温带	A(湿润区)	IIA3 松辽平原东部山前台地针阔叶混交林区	针阔混交林,湿地
	B(半湿润区)	IIB1 松辽平原中部森林草原区	典型草原,农田
		IIB2 大兴安岭中段山地草原森林区	阔叶林,草甸
		IIB3 大兴安岭北段西侧森林草原区	草甸草原,草甸
	C(半干旱区)	IIC1 西辽河平原草原区 IIC2 大兴安岭南端草原区	典型草原,农田典型草原,灌丛
		IIC3 内蒙古东部草原区	典型草原,农田
		IIC4 呼伦贝尔平原草原区	典型草原,草甸
	D(干旱区)	IID1 鄂尔多斯及内蒙古高原西部荒漠草原区	典型草原,荒漠
	D(干旱区)	IID2 阿拉善与河西走廊荒漠区	荒漠,荒漠草原
III 暖温带	B(半湿润区)	IIIB3 华北山地落叶阔叶林区	农田,典型草原

生态分区	NPP(g C/m²)
IA1	590.99
IIA3	591.27
IIB1	405.05
IIB2	593.64
IIB3	487.52
IIC1	363.16
IIC2	466.15
IIC3	301.88
IIC4	323.65
IID1	153.05
IID2	76.45
IIIB3	528.94

生态分区	NEP(g C/m²)
IA1	4448.90
IIA3	3972.41
IIB1	1297.88
IIB2	4353.57
IIB3	3194.29
IIC1	885.54
IIC2	2626.31
IIC3	715.18
IIC4	1295.56
IID1	-960.22
IID2	-1436.88
IIIB3	2849.03

生态分区	NPP变化率(g C/m²·12a)
IA1	5.55
IIA3	3.17
IIB1	7.44
IIB2	4.34
IIB3	6.36
IIC1	3.01
IIC2	-1.99
IIC3	3.07
IIC4	11.40
IID1	3.04
IID2	0.93
IIIB3	3.73

生态分区	NEP变化率(g C/m²·12a)
IA1	2.40
IIA3	-1.75
IIB1	-2.35
IIB2	-0.51
IIB3	3.11
IIC1	-3.50
IIC2	-2.83
IIC3	3.55
IIC4	7.57
IID1	3.35
IID2	2.04
IIIB3	1.06

内蒙古草地生态系统碳源/汇时空格局及其与气候因子的关系

Spatial-temporal features of carbon source-sink and its relationship with climate factors in Inner Mongolia grassland ecosystem

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