Three decades of irrigated sugarcane cropping increased the soil carbon stock and substituted most of the original carbon in the brazilian drylands.
2025
SANTOS, L. R. C. | FREITAS, A. D. S. | SILVA, A. F. | MENEZES, R. S. C. | FERNANDES JUNIOR, P. I. | CAMARGO, P. B. | SAMPAIO, E. V. S. B. | LEANDRO REIS COSTA SANTOS, UNIVERSIDADE FEDERAL RURAL DE PERNAMBUCO; A. D. S. FREITAS, UNIVERSIDADE FEDERAL RURAL DE PERNAMBUCO; A. F. SILVA, UNIVERSIDADE FEDERAL RURAL DE PERNAMBUCO; R. S. C. MENEZES, UNIVERSIDADE FEDERAL DE PERNAMBUCO; PAULO IVAN FERNANDES JUNIOR, CPATSA; P. B. CAMARGO, UNIVERSIDADE DE SÃO PAULO; E. V. S. B. SAMPAIO, UNIVERSIDADE FEDERAL DE PERNAMBUCO.
Soil carbon (C) dynamics are increasingly studied because of their role in theglobal C cycle and potential influence on atmospheric carbon dioxide con-centrations and climatic changes. The substitution of native forests by cropfields usually decreases soil C stocks. However, C stocks may increase inirrigated fields of semiarid areas because high biomass production and litterincorporation may compensate for the fast turnover of organic matter. Using13C isotopic techniques, we determined soil C dynamics in the 1 m super-ficial layer, in irrigated sugarcane fields established 10 and 30 years before.From 57% to 78% of the original C stock were lost after 10 years of cultivationand from 85% to 95% after 30 years. However, these high losses were morethan compensated by sugarcane biomass inputs, and the total soil C stockincreased from 94 to 169 Mg ha-1 between 10 and 30 years of cultivation.This last C stock is higher than any reported for soils in the Brazilian semiaridregion. Therefore, substituting native dry deciduous forests by irrigatedpermanent sugarcane in semiarid areas may increase soil C stocks, contraryto most rain-fed and irrigated cropping systems with crops that accumulateless biomass than sugarcane.
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