| Temporal and spatial differences in carbon footprint of regional farmland ecosystem in Xinjiang during recent 20 years |
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| DOI：10.7606/j.issn.1000-7601.2016.05.37 |
| Key Words: farmland ecosystem carbon footprint carbon emission carbon absorption spatial and temporal variations |
| Author Name | Affiliation | | WANG Jing-zhe | School of Resources and Environment Science, Xinjiang University, Urumqi, Xinjiang 830046, China
Key Laboratory of Oasis Ecology Ministry of Education, Xinjiang University, Urumqi, Xinjiang 830046, China | | LIU Zhi-hui | School of Resources and Environment Science, Xinjiang University, Urumqi, Xinjiang 830046, China
Key Laboratory of Oasis Ecology Ministry of Education, Xinjiang University, Urumqi, Xinjiang 830046, China
Institute of Arid Ecology and Environment, Xinjiang University, Urumqi, Xinjiang 830046, China
International Center for Desert Affairs-Research on Sustainable Development in Arid and Semi-arid Lands, Urumqi, Xinjiang 830046, China | | ZHANG Bo | Xinjiang Key Laboratory for Environmental Pollution Monitoring and Risk Warning, Xinjiang Academy of Environmental Protection Science, Urumqi, Xinjiang 830011, China |
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| Abstract: |
| Statistic data on investment in farmland production and yield in Xinjiang from 1994 to 2013 were collected, and the carbon emissions coefficient method was employed to estimate the carbon emissions and absorptions of farmland ecosystems and carbon footprints in Xinjiang and their distribution in counties and cities. The results showed that the carbon emissions of farmland ecosystem in Xinjiang were increased from 1.7946 million tons in 1994 to 4.7415 million tons in 2013. Carbon emissions were mainly derived from increased agriculture fertilizer usage over years and irrational irrigation methods, with biggest contribution rates of 40.02% and 41.56%, respectively. Carbon absorption in farmland ecosystem was increased by 21.8504 million tons over 20 years, contributing the most to the carbon absorption in farmland ecosystem of Xinjiang, and its annual average contribution rate reached 47%. Farmland ecosystem carbon emissions and carbon absorption in Xinjiang area presented the obvious spatial agglomeration in some counties and cities in southern Xinjiang and displayed a trend of being symmetrical along the Tianshan mountain. Farmland ecosystem carbon footprints showed a trend of rapid growth, from 2 732.63×104 C·hm-2·a-1 in 1994 to 4 474.89×104 C·hm-2·a-1 in 2013. Carbon footpr
int had increased by 283.59×104 C·hm-2·a-1, indicating that carbon ecological surplus was found in farmland ecosystems of Xinjiang. In 11 years, the planting structure ecological indexes were greater than 1. Therefore, adjustment of planting structure is imminent. |
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