Soil C and N changes with afforestation of grasslands across gradients of precipitation and plantation age

被引:132
作者
Berthrong, Sean T. [1 ]
Pineiro, Gervasio [2 ]
Jobbagy, Esteban G. [3 ,6 ]
Jackson, Robert B. [1 ,4 ,5 ]
机构
[1] Duke Univ, Univ Program Ecol, Durham, NC 27708 USA
[2] Univ Buenos Aires, CONICET, Fac Agron, Lab Anal Reg & Teledetecc,IFEVA, Buenos Aires, DF, Argentina
[3] Univ Nacl San Luis, IMASL, Grp Estudios Ambientales, RA-5700 San Luis, Argentina
[4] Duke Univ, Dept Biol, Durham, NC 27708 USA
[5] Duke Univ, Nicholas Sch Environm, Durham, NC 27708 USA
[6] Consejo Nacl Invest Cient & Tecn, RA-5700 San Luis, Argentina
基金
美国国家科学基金会;
关键词
afforestation; Argentina; Eucalyptus plantation; precipitation; soil nitrogen; soil organic carbon; Uruguay; EXCHANGEABLE CATIONS; LITTER DECOMPOSITION; CARBON SEQUESTRATION; BIASED-ESTIMATION; RIDGE-REGRESSION; NITROGEN; FORESTS; CLIMATE; WATER; ESTABLISHMENT;
D O I
10.1890/10-2210.1
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Afforestation, the conversion of unforested lands to forests, is a tool for sequestering anthropogenic carbon dioxide into plant biomass. However, in addition to altering biomass, afforestation can have substantial effects on soil organic carbon (SOC) pools, some of which have much longer turnover times than plant biomass. An increasing body of evidence suggests that the effect of afforestation on SOC may depend on mean annual precipitation (MAP). The goal of this study was to test how labile and bulk pools of SOC and total soil nitrogen (TN) change with afforestation across a rainfall gradient of 600-1500 mm in the Rio de la Plata grasslands of Argentina. and Uruguay. The sites were all former grasslands planted with Eucalyptus spp. Overall, we found that afforestation increased (up to 1012 kg C.ha(-1).yr(-1)) or decreased (as much as 1294 kg C.ha(-1).yr(-1)) SOC pools in this region and that these changes were significantly related to MAP. Drier sites gained, and wetter sites lost, SOC and TN (r(2)=0.59, P=0.003; and r(2)=0.57, P=0.004, respectively). Labile C and N in microbial biomass and extractable soil pools followed similar patterns to bulk SOC and TN. Interestingly, drier sites gained more SOC and TN as plantations aged, while losses reversed as plantations aged in wet sites, suggesting that plantation age in addition to precipitation is a critical driver of changes in soil organic matter with afforestation. This new evidence implies that longer intervals between harvests for plantations could improve SOC storage, ameliorating the negative trends found in humid sites. Our results suggest that the value of afforestation as a carbon sequestration tool should be considered in the context of precipitation and age of the forest stand.
引用
收藏
页码:76 / 86
页数:11
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