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Open AccessArticle

Rapid Sequestration of Ecosystem Carbon in 30-year Reforestation with Mixed Species in Dry Hot Valley of the Jinsha River

by Zhilian Gong 1,2, Ya Tang 2, Wenlai Xu 3,4,* and Zishen Mou 3,*
1
Department of Environment Engineering, College of Food and Biological Engineering, Xihua University, Chengdu 610039, China
2
Department of Environment, College of Architecture and Environment, Sichuan University, Chengdu 610065, China
3
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
4
Haitian Water Grp Co Ltd., Chengdu 610059, China
*
Authors to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2019, 16(11), 1937; https://doi.org/10.3390/ijerph16111937
Received: 30 April 2019 / Revised: 27 May 2019 / Accepted: 27 May 2019 / Published: 31 May 2019
Reforestation plays an important role in the carbon cycle and climate change. However, knowledge of ecosystem carbon sequestration through reforestation with mixed species is limited. Especially in dry hot valley of the Jinsha River, no studies cover total ecosystem carbon sequestration level in mature mixed plantations for a limited area of mixed plantations and difficulty in the sampling of plant roots and deep soil. In this study, carbon sequestration of seven mixed plantations of different ages in dry hot valley of the Jinsha River was investigated with analogous sites method. The results are as follows: 1) Deep soil organic carbon (SOC) storage significantly increased with stand age (p = 0.025), possibly due to fine root exudates and dissolved organic carbon transportation into deep soil and retention. 2) Total biomass carbon storage in the 30-year-old mixed plantation was 77.78 t C ha−1, 54 times reference wasteland and 9 times reference natural recovery shrub-grassland. However, total biomass carbon storage of 30-year-old mixed plantation was insignificantly lower than that of reference natural forest (p = 0.429). After 30 years of reforestation, plantation biomass carbon storage recovered to reference level, and its sequestration rate was 2.54 t C ha−1 yr−1. 3) The total ecosystem carbon storage of 30-year-old mixed plantation was 185.50 t C ha−1, 2.38 times reference wasteland, 2.29 times reference natural recovery shrub grassland, and 29% lower than reference natural forest. It indicated that niche complementary, good stand structure, and characteristics of dominant species Leucaena leucocephala in mixed plantations facilitate more rapid carbon sequestration, especially biomass carbon in the dry hot valley. View Full-Text
Keywords: deep soil organic carbon; total ecosystem carbon sequestration; mixed plantation; biomass carbon deep soil organic carbon; total ecosystem carbon sequestration; mixed plantation; biomass carbon
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Gong, Z.; Tang, Y.; Xu, W.; Mou, Z. Rapid Sequestration of Ecosystem Carbon in 30-year Reforestation with Mixed Species in Dry Hot Valley of the Jinsha River. Int. J. Environ. Res. Public Health 2019, 16, 1937.

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