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Spatio-temporal patterns of soil organic carbon and pH in relation to environmental factors—A case study of the Black Soil Region of Northeastern China.

Ou, Yang; Rousseau, Alain N.; Wang, Lixia; Yan, Baixing (2017). Spatio-temporal patterns of soil organic carbon and pH in relation to environmental factors—A case study of the Black Soil Region of Northeastern China. Agriculture, Ecosystems & Environment , vol. 245 . p. 22-31. DOI: 10.1016/j.agee.2017.05.003.

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Résumé

The Northeastern Black Soil Region plays a key role in food supply in China. Identifying spatio-temporal variation of soil properties as influenced by environmental factors has become essential for future agricultural development. A total of 5891 topsoil samples (0–20 cm) were collected and soil organic carbon (SOC) and pH were measured in the Jilin Province. Geostatistics, multiple linear regression, and redundancy analysis (RDA) were used to highlight the spatio-temporal patterns of SOC and pH and determine the relationship with environmental factors. Results showed that from 1980 to 2010 average level of SOC increased by 2.68 g kg⁻¹ (p < 0.001). However, in the Golden-Maize-Belt Counties (i.e., the major grain-producing areas of the Jilin Province), the SOC content rapidly decreased, the largest drop reaching 24.83 g kg⁻¹. Over the past thirty years, pH values slightly increased (0.30; p > 0.05) throughout the province. Environmental factors could explain 64% and 78% of the spatial patterns of SOC and pH, respectively. The principal factors impacting SOC and pH included: precipitation, gully density, forested land and grain yield. There was significant covariation between natural and human factors in forming these spatial patterns. Anthropogenic disturbance had a larger influence on the distribution of SOC than on the distribution of pH.

Type de document: Article
Mots-clés libres: soil organic carbon; pH; geostatistics; environmental factors; Black soil region
Centre: Centre Eau Terre Environnement
Date de dépôt: 07 mai 2018 19:26
Dernière modification: 07 mai 2018 19:26
URI: http://espace.inrs.ca/id/eprint/6429

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