Influence of land use changes on soil total organic carbon and dissolved organic carbon in wetland

doi:10.3969/j.issn.1004-1524.2020.03.13

›› 2020, Vol. 32 ›› Issue (3): 475-482.DOI: 10.3969/j.issn.1004-1524.2020.03.13

• Environmental Science • Previous Articles Next Articles

Influence of land use changes on soil total organic carbon and dissolved organic carbon in wetland

JIAN Xing^1,2, ZHAI Xiaoyu³, WANG Yu³, CAI Yangyang³

1.School of Architecture, Anhui Science and Technology University, Bengbu 233030, China;
2.Key Laboratory of Bio-Organic Fertilizer Creation, Ministry of Agriculture and Rural Affairs, Bengbu 233030, China;
3.School of Life and Health Science, Anhui Science and Technology University, Bengbu 233030, China

Received:2019-10-15 Online:2020-03-25 Published:2020-04-03

Abstract

Abstract: In order to explore the effects of land use changes on soil total organic carbon (TOC) and dissolved organic carbon (DOC) in wetland, based on the concept of space as a substitute for time, the contents of TOC and DOC of wetland and four types of land changed from wetland, including two kinds of cultivated lands with different reclamation years, orchard land and woodland, were measured. The results showed that, three years after the wetland was reclaimed as cultivated land, TOC content in 0-30 cm soil layer decreased significantly (P<0.05), and thirty years after reclamation, only 0-10 cm topsoil TOC content was accumulated and restored to the same level as wetland. This indicated that the loss and accumulation of soil carbon were unequal in time and space after reclamation of wetland. The occurrence period of carbon loss was short and concentrated in 0-30 cm soil layer, and carbon accumulation took a long time and carbon was mainly accumulated in surface soils of 0-10 cm. The DOC content of wetland, newly cultivated land and woodland did not show an increasing trend with the increase of soil layer in soil profile, but the DOC/TOC increased with the increase of soil layer in four land use types except newly cultivated land. So, compared with DOC content, DOC/TOC was more sensitive to the change of soil depth, and was more suitable to characterize the change of DOC in the direction of soil profile. It was found that DOC/TOC in 0-20 cm soil layer was irrelevant to land use types, and at the initial stage of wetland conversion to cultivated land, DOC/TOC of soil layer below 20 cm decreased, but increased significantly (P<0.05) after 30 years of cultivation. After three years of conversion from cultivated land to orchard land, DOC/TOC decreased significantly (P<0.05) in 30-50 cm soil layer, while there was no significant difference in DOC/TOC among different soil layers after wetland was transformed into woodland.

Key words: wetlands soil, land use, soil organic carbon, dissolved organic carbon

CLC Number:

S153
X24

JIAN Xing, ZHAI Xiaoyu, WANG Yu, CAI Yangyang. Influence of land use changes on soil total organic carbon and dissolved organic carbon in wetland[J]. , 2020, 32(3): 475-482.

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Influence of land use changes on soil total organic carbon and dissolved organic carbon in wetland

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