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

Abstract

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

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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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

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

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