Temporal and spatial variations of net primary productivity and its response to groundwater of a typical oasis in the Tarim Basin,China

SUN Lingxiao ¹YU Yang ²GAO Yuting ³ZHANG Haiyan ⁴YU Xiang ¹HE Jing ¹WANG Dagang ⁵Ireneusz MALIK ⁶Malgorzata WISTUBA ⁶YU Ruide⁷

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作者信息

1. State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;University of Chinese Academy of Sciences,Beijing 100049,China
2. State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;University of Chinese Academy of Sciences,Beijing 100049,China;Cele National Station of Observation and Research for Desert-Grassland Ecosystems,Cele 848300,China;University of Silesia in Katowice,Institute of Earth Sciences,Polish-Chinese Centre for Environmental Research,Bankowa 12,40-007 Katowice,Poland
3. State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China
4. State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;University of Chinese Academy of Sciences,Beijing 100049,China;University of Silesia in Katowice,Institute of Earth Sciences,Polish-Chinese Centre for Environmental Research,Bankowa 12,40-007 Katowice,Poland
5. State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;University of Chinese Academy of Sciences,Beijing 100049,China;Cele National Station of Observation and Research for Desert-Grassland Ecosystems,Cele 848300,China
6. State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;University of Silesia in Katowice,Institute of Earth Sciences,Polish-Chinese Centre for Environmental Research,Bankowa 12,40-007 Katowice,Poland
7. State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;University of Chinese Academy of Sciences,Beijing 100049,China;University of Silesia in Katowice,Institute of Earth Sciences,Polish-Chinese Centre for Environmental Research,Bankowa 12,40-007 Katowice,Poland;School of Environment and Material Engineering,Yantai University,Yantai 264005,China
折叠

Abstract

Net primary productivity (NPP) of the vegetation in an oasis can reflect the productivity capacity of a plant community under natural environmental conditions. Owing to the extreme arid climate conditions and scarce precipitation in the arid oasis regions, groundwater plays a key role in restricting the development of the vegetation. The Qira Oasis is located on the southern margin of the Taklimakan Desert (Tarim Basin, China) that is one of the most vulnerable regions regarding vegetation growth and water scarcity in the world. Based on remote sensing images of the Qira Oasis and daily meteorological data measured by the ground stations during the period 2006-2019, this study analyzed the temporal and spatial patterns of NPP in the oasis as well as its relation with the variation of groundwater depth using a modified Carnegie Ames Stanford Approach (CASA) model. At the spatial scale, NPP of the vegetation decreased from the interior of the Qira Oasis to the margin; at the temporal scale, NPP of the vegetation in the oasis fluctuated significantly (ranging from 29.80 to 50.07 g C/(m2•month)) but generally showed an increasing trend, with the average increase rate of 0.07 g C/(m2•month). The regions with decreasing NPP occupied 64％ of the total area of the oasis. During the study period, NPP of both farmland and grassland showed an increasing trend, while that of forest showed a decreasing trend. The depth of groundwater was deep in the south of the oasis and shallow in the north, showing a gradual increasing trend from south to north. Groundwater, as one of the key factors in the surface change and evolution of the arid oasis, determines the succession direction of the vegetation in the Qira Oasis. With the increase of groundwater depth, grassland coverage and vegetation NPP decreased. During the period 2008-2015, with the recovery of groundwater level, NPP values of all types of vegetation with different coverages increased. This study will provide a scientific basis for the rational utilization and sustainable management of groundwater resources in the oasis.

Key words

net primary productivity/Carnegie Ames Stanford Approach/groundwater depth/land use/NDVI/Qira Oasis

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基金项目

This research was supported by the West Light Foundation of the Chinese Academy of Sciences(2021VCA0003)

This research was supported by the West Light Foundation of the Chinese Academy of Sciences(2021VCB0013)

出版年

2021

干旱区科学

中国科学院新疆生态与地理研究所,科学出版社

干旱区科学

CSTPCDCSCDSCI

影响因子：1.743

ISSN：1674-6767

被引量1

参考文献量12

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