为了解我国西南喀斯特地貌区退耕还林工程主要林分土壤碳储量变化,选取贵州省兴义市三江口镇退耕还林工程杉木林为研究对象,并以耕地为对照,对不同林龄及耕地的土壤有机碳储量进行了测定及分析。结果表明:各土层(0~20cm,20-40cm,40~60cm)土壤容重的年际变化除表层略有波动外均随林龄的增长而减少,0~ 60cm深度整层土壤容重随林龄增长年均减少4.27%,各层间土壤容重随土层加深而增加,不同林龄间增量各异; 0~60cm深度内土壞有机碳储量在造林后5年内随林龄增长而减少,平均每年下降9.27%; 5年后随林龄增长而增加,平均每年增加8.44%,但在退耕还林后11年土壤有机碳储量未能恢复到耕地水平;土壞有机碳含量及储量在垂直方向上均呈现随土层加深而减少,不同林龄间差异明显,其年际变幅也随土层加深而减少。关键词:退耕还林;杉木;土壤;有机碳储量
HE Xuezhi
,
CHEN Xiangang
,
ZHANG Rui
,
LI Xin
,
W ANG Yanxia
,
JIANG Lei
. 退耕还林杉木林地土壤有机碳储量变化特征以贵州兴义市三江口镇为例[J]. 林草资源研究, 2015
, 0(2)
: 102
-106
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DOI: 10.13466/j.cnki.lyzygl.2015.02.019
To get more informain about the impacl of lhe Grain for Green Program on soil organic carbon pol. ,soil samples were clele and ase also .from the fir forest in Snjingu lownship, Xingyi mnicipali .Guihou Province, icludin cmpland and six slands wih the difefen age . The resuht show that the soil buk densiy dereses wih stand age by an anmal raule of4. 27% in 0 ~ 60cm layer. The soil bulk density icrerses wih the deep of sol layer. The soil onganic cabhon suornge in fir foretis decraes wih sand age by an amal rate of9.27% in the first 5 years afer afortatio and icrses by an anmual rate of8. 44% from 6 lo 11 years. Bu the soil organie carhon suonge in he fir forest has nol egained that level in frmland at the 11 yer afer aorertitro The soil organice carbhon stornge in fir forets deres with the deep ouf soil layer.
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