Temporal and spatial differences in carbon footprint in farmland ecosystem: A case study of Henan Province, China.

doi:10.13287/j.1001-9332.201709.015

Abstract

Abstract: Farmland ecosystem is an important part of terrestrial ecosystem, which plays a dual role of carbon source and carbon sink. It has important significance for the maintenance of carbon ba-lance of the whole ecosystem. In this paper, the farmland ecosystem was taken as the research object, ArcGIS 10.1, SPSS 20, Sigmaplot 12.5 were adopted to construct farmland ecosystem carbon footprint model, and to calculate and analyze the relationships among carbon emissions, carbon absorption and carbon footprint in farmland ecosystem in Henan Province. The results showed that, from 2005 to 2014, the average annual growth rate of carbon emission was 2.7% in the researcharea. The carbon emission caused by the fertilizer application in the area accounted for 66.2% of the total carbon emission, which was the highest among all sources. The application intensity of fertilizer was 890.38 kg·hm^-2, which was far higher than the recognized security warning line in developed countries (225 kg·hm^-2). Overall, the total carbon storage showed an upward trend in farmland ecosystem in Henan Province. Wheat had the highest proportion of carbon uptake, accounting for 60% of the total carbon absorption, and the rice had the fastest growth rate of carbon absorption at 7.9%. The farmland ecosystem in Henan Province had a carbon surplus and farmland ecosystem carbon footprint showed an overall increasing trend. Farmland ecosystem carbon footprint accounted for 5.7% of productive land area over the same period. Carbon emission, carbon sequestration and carbon footprint had similar spatial distributions, which appeared more in the southeast and less in the northwest, and large regional differences and variation range were their most important external features.

Key words: Henan Province, carbon footprint, spatial distribution, farmland ecosystem

ZHANG Peng-yan, HE Jian-jian, PANG Bo, LU Cheng-peng, QIN Ming-zhou, LU Qian-cheng. Temporal and spatial differences in carbon footprint in farmland ecosystem: A case study of Henan Province, China.[J]. Chinese Journal of Applied Ecology, 2017, 28(9): 3050-3060.

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