2000—2015年中蒙俄经济走廊东段冻土时空变化及植被响应

doi:10.11821/dlxb202105014

Abstract

Abstract:

The eastern segment of the China-Mongolia-Russia economic corridor is situated in the overlap region of the southeast margin of Eurasia permafrost region and the southern border of the tree line, where fragile frozen ground and ecosystems have been maintained. In this study, we analyzed the spatiotemporal distribution and annual change of frozen ground, leaf area index (LAI), and the vegetation green-up data in the eastern China-Mongolia-Russia economic corridor from 2000 to 2015 based on the MERRA-Land data product, GLOBMAP LAI, and MODIS EVI dataset. The main controlling environmental factors of the green-up date and the status of vegetation growth in the different periods over a year were calculated by grey correlation analysis, and then the response of vegetation growth in typical areas to the freezing-thawing changes of the frozen ground was analyzed. Some conclusions can be drawn as follows. (1) In the past 16 years, permafrost and seasonal frost in the eastern China-Mongolia-Russia economic corridor was persistently and significantly degraded, which was mainly reflected by the early thawing and delayed freezing of the frozen ground in time, and manifested as the disappearance of permafrost and the uplift of the lower limit of seasonal frost in the southern isolated permafrost, and the thickening of the active layer in the southern continuous permafrost in space. (2) In about 48% of forest areas, the onset day of frozen ground melting is the main factor affecting the start of vegetation greening season. The growth situation of vegetation in forest areas is altered by the soil water from thawing frozen ground and the hydrothermal mechanisms of peatland. (3) With the transition from forest and peatland to meadow or farmland, the frozen ground degrades and in turn further facilitates the fade of peatland. Exploring the synergetic relationship between the degradation of frozen ground and the ecological environment is helpful to identify the vulnerable regions of degrading frozen ground and the sensitive regions of the ecological environment under the influence of climate warming and human activities.

Key words: eastern China-Mongolia-Russia economic corridor, ground freeze-thawing process, vegetation growth, gray correlation analysis

LIU Zhenhai, WANG Shaoqiang, CHEN Bin. Spatial and temporal variations of frozen ground and its vegetation response in the eastern segment of China-Mongolia-Russia economic corridor from 2000 to 2015[J].Acta Geographica Sinica, 2021, 76(5): 1231-1244.

Figures/Tables 7

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站点	时段/年份	深度(m)	经纬度	海拔高度 (m)	来源	MERRA-Land土壤温度数据多层平均精度
站点	时段/年份	深度(m)	经纬度	海拔高度 (m)	来源	RMSE	MAE	R²
SW2	2010	0.1	111.9°E, 41.79°N	1457	FLUXNET^[16]	4.73	4.04	0.96
DU3	2009—2010	0.1	116.28°E, 42.06°N	1293	FLUXNET^[17]	4.39	3.81	0.89
CNG	2007—2010	0.05	123.51°E, 44.59°N	140	FLUXNET^[18]	2.6	2.02	0.98
DXF	2003—2005	0, 0.05, 0.4, 1	121.51°E, 50.96°N	832	国家生态系统观测研究网络^[19]	6.71	5.31	0.87
HLA	2014	0, 0.1, 0.15, 0.2, 0.4, 0.6, 1	126.93°E, 47.45°N	206	国家生态系统观测研究网络^[19]	4.91	4.09	0.91
CHB	2003—2005	0.1	128.1°E, 42.4°N	738	国家生态系统观测研究网络^[19]	3.03	2.23	0.95
SKT	2003—2006	0.1	108.65°E, 48.35°N	1630	AsiaFlux^[20]	4.3	3.11	0.98
KBU	2004—2005	0.1	108.74°E, 47.21°N	1235	AsiaFlux^[21]	4.29	3.43	0.92
Olkhon	2012	0.5, 1, 1.5, 3.65	107.45°E, 53.22°N	649	GTN-P^[22]	3.28	2.52	0.95
Azarova	2008—2009	0.5, 1	117.58°E, 56.9°N	2142	GTN-P^[23]	2.82	2.24	0.91
Most	2012—2015	5	118.28°E, 56.91°N	708	GTN-P^[23]	3.79	3.61	0.78
Chara	2007—2009, 2013—2015	3.6, 5	118.36°E, 56.67°N	1244	GTN-P^[23]	3.09	2.71	0.7
Ushelistiy	2009—2015	0.3	118.48°E, 56.54°N	1967	GTN-P^[23]	7.08	6.21	0.95

Spatial and temporal variations of frozen ground and its vegetation response in the eastern segment of China-Mongolia-Russia economic corridor from 2000 to 2015

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