摘要
采用材积源生物量法和土壤剖面分析方法,研究了四川彭州栽植5、10、17、22、26a的人工柳杉林碳蓄积量及土壤性质的动态变化.结果表明,柳杉林分的碳蓄积量与林下土壤有机碳积累量随柳杉林龄的增长而增加,5、10、17、22、26a生人工柳杉林碳蓄积量分别是19.8、67.5、85.8、162、275t(C)hm-2,土壤有机碳含量在5、10、17、22、26年分别为14.7、18.4、25.3、37.1、41.4gkg-1,比农地分别增加了18.5%、48.4%、104%、199%、234%,土壤全N含量分别为1.22、1.31、1.64、2.03、2.12gkg-1,比农地分别增加了7.02%、14.91%、43.86%、78.07%、85.96%,土壤容重分别为1.48、1.42、1.36、1.31、1.28gcm-3,比农地分别降低了3.90%、7.79%、11.7%、14.9%、16.9%,土壤总孔隙度和毛管孔隙度也都显著增高,说明栽植柳杉后随着土壤有机质的增加,土壤肥力逐步提高,土壤孔隙状况也逐渐好转,从而增加了土壤保水抗旱能力.5、10、17、22、26a生的柳杉林地土壤蓄水量分别为341、391、412、462、493thm-2,比农地分别增加了14.8%、31.6%、38.7%、55.6%、66.0%.这些结果显示,人工柳杉林具有庞大的碳库,可缓解大气CO2上升,而且可促进土壤肥力,改善生态环境.
Carbon storage and soil properties in Japanese cedar （ Cryptomeria fortunei） plantations of 5, 10, 17, 22 and 26 years old were studied in Pengzhou County, Sichuan, China, employing volume -biomass method and soil profile investigation. Carbon storage and soil organic carbon in C. fortunei plantations increased with tree ages. The C. fortunei plantations stored 19.8, 67.5, 85.8, 162 and275 t （C） hm^-2 at the tree ages of 5, 10, 17, 22 and 26 years, respectively. Soil organic carbon was 12.4, 14. 7, 18.4, 25. 3, 37.1 and 41.4 g kg^-1 in 5, 10, 17, 22 and 26 years-old plantations, and 18.5%, 48.4%, 104%, 199% and 234% higher than that in farmland, respectively. Soil N was 1.22, 1.31, 1.64, 2.03 and 2. 12 g kg^-1 in 5, 10, 17, 22, and 26 years-old plantations, but 1.14 g kg^-1 in farmland soil. As compared to the farmland, the tree plantation decreased soil bulk density by 3.90% - 16. 9%, while increased soil total porosity and soil capillary porosity by 2.91% -31.8% and 2. 6% - 43.2%, resulting in 15% -66% increase in soil moisture content. Those suggested that the plantation of C. fortunei may increase carbon fixation, alleviate atmospheric CO2 rise, and improve soil fertility and environment.
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2007年第6期777-781,共5页
Chinese Journal of Applied and Environmental Biology
基金
国家"十五"重大科技攻关项目(2002BA901A15)
国家重点基础研究发展计划(2005CB121108)资助~~
关键词
人工柳杉林
碳蓄积量
土壤有机碳
土壤性质
Cryptomeria fortunei plantation
carbon storage
soil organic carbon
soil property
