Arid
DOI10.1111/j.1365-2486.2012.02761.x
Shifts in soil organic carbon for plantation and pasture establishment in native forests and grasslands of South America
Eclesia, Roxana P.1,5; Jobbagy, Esteban G.2; Jackson, Robert B.3; Biganzoli, Fernando4; Pineiro, Gervasio5
通讯作者Eclesia, Roxana P.
来源期刊GLOBAL CHANGE BIOLOGY
ISSN1354-1013
出版年2012
卷号18期号:10页码:3237-3251
英文摘要

The replacement of native vegetation by pastures or tree plantations is increasing worldwide. Contradictory effects of these land use transitions on the direction of changes in soil organic carbon (SOC) stocks, quality, and vertical distribution have been reported, which could be explained by the characteristics of the new or prior vegetation, time since vegetation replacement, and environmental conditions. We used a series of paired-field experiments and a literature synthesis to evaluate how these factors affect SOC contents in transitions between tree- and grass-dominated (grazed) ecosystems in South America. Both our field and literature approaches showed that SOC changes (020cm of depth) were independent of the initial native vegetation (forest, grassland, or savanna) but strongly dependent on the characteristics of the new vegetation (tree plantations or pastures), its age, and precipitation. Pasture establishment increased SOC contents across all our precipitation gradient and C gains were greater as pastures aged. In contrast, tree plantations increased SOC stocks in arid sites but decreased them in humid ones. However, SOC losses in humid sites were counterbalanced by the effect of plantation age, as plantations increased their SOC stocks as plantations aged. A multiple regression model including age and precipitation explained more than 50% (p<0.01) of SOC changes observed after sowing pastures or planting trees. The only clear shift observed in the vertical distribution of SOC occurred when pastures replaced native forests, with SOC gains in the surface soil but losses at greater depths. The changes in SOC stocks occurred mainly in the silt+clay soil size fraction (MAOM), while SOC stocks in labile (POM) fraction remained relatively constant. Our results can be considered in designing strategies to increase SOC storage and soil fertility and highlight the importance of precipitation, soil depth, and age in determining SOC changes across a range of environments and land-use transitions.


英文关键词soil organic matter rainforests land use transitions vegetation replacement mean annual precipitation plantation age
类型Article
语种英语
国家Argentina ; USA
收录类别SCI-E
WOS记录号WOS:000308443800021
WOS关键词LAND-USE CHANGE ; PARTICLE-SIZE FRACTIONS ; NATURAL C-13 ABUNDANCE ; NET PRIMARY PRODUCTION ; EASTERN AMAZONIA ; MATTER DYNAMICS ; PINUS-RADIATA ; NITROGEN DYNAMICS ; AFFORESTATION ; STOCKS
WOS类目Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/172657
作者单位1.Estn Expt Agr INTA Cerro Azul, Misiones, Argentina;
2.Univ Nacl San Luis, CONICET, IMASL, Grp Estudios Ambientales, San Luis, Argentina;
3.Duke Univ, Nicholas Sch Environm, Ctr Global Change, Dept Biol, Durham, NC 27708 USA;
4.Univ Buenos Aires, Fac Agron, Dept Metodos Cuantitativos & Sistemas Informac, Buenos Aires, DF, Argentina;
5.Univ Buenos Aires, Fac Agron, IFEVA, CONICET, Buenos Aires, DF, Argentina
推荐引用方式
GB/T 7714
Eclesia, Roxana P.,Jobbagy, Esteban G.,Jackson, Robert B.,et al. Shifts in soil organic carbon for plantation and pasture establishment in native forests and grasslands of South America[J],2012,18(10):3237-3251.
APA Eclesia, Roxana P.,Jobbagy, Esteban G.,Jackson, Robert B.,Biganzoli, Fernando,&Pineiro, Gervasio.(2012).Shifts in soil organic carbon for plantation and pasture establishment in native forests and grasslands of South America.GLOBAL CHANGE BIOLOGY,18(10),3237-3251.
MLA Eclesia, Roxana P.,et al."Shifts in soil organic carbon for plantation and pasture establishment in native forests and grasslands of South America".GLOBAL CHANGE BIOLOGY 18.10(2012):3237-3251.
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