摘要
土壤无机碳特别是成土碳酸盐的固定是滨海地区降低大气二氧化碳浓度,缓解气候变化的重要途径之一。本研究选取江苏省北部滨海地区的互花米草湿地(SA)、碱蓬湿地(SS)、幼龄杨树人工林(YP)和成熟杨树人工林(MP),分层采集不同深度的土壤样品(0~10、11~20、21~40、41~60、61~80和81~100cm),利用^(13)C稳定同位素技术,分析了不同土壤的无机碳组成和储量的差异,并探究了影响成土碳酸盐储量的关键土壤理化性质。结果表明:除MP表层土壤(0~10cm)外,其余土壤的无机碳含量均高于有机碳含量。整体而言,SA和SS土壤成土碳酸盐占无机碳的比例和无机碳储量的差异均不显著。与湿地土壤相比(0~40 cm),YP和MP土壤的成土碳酸盐占无机碳的比例分别降低了32.7%和54.1%,成土碳酸盐储量分别降低了40.5%和59.2%,成岩碳酸盐储量没有显著变化,无机碳储量分别降低了21.0%和17.9%。与YP土壤相比(0~100cm),MP土壤的成土碳酸盐占无机碳的比例和成土碳酸盐储量均显著降低而成岩碳酸盐储量显著升高,尤其是41~100cm土层,而无机碳储量没有显著变化。结构方程模型表明,土壤成土碳酸盐占无机碳的比例是影响成土碳酸盐储量的最重要因子,其次是有机碳含量和容重,并且土壤有机碳抑制了成土碳酸盐的形成。综上,滨海湿地土壤比杨树人工林土壤具有更大的无机碳储量和固定潜力,通过改变成土碳酸盐占无机碳的比例和有机碳含量能够调控该地区土壤成土碳酸盐的固定。
The sequestration of soil inorganic carbon(SIC)especially pedogenic carbonate(PC)is one of the important pathways reducing the concentration of atmospheric carbon dioxide and thus mitigating climate change in coastal areas.Using the technology of^(13)C stable isotope,we analyzed the differences in the composition and storage of SIC,and explored the key physicochemical properties influencing soil PC storage in different horizons(0-10,11-20,21-40,41-60,61-80 and 81-100 cm)from Suaeda salsa wetland(SS),Spartina alterniflora wetland(SA),young poplar plantation(YP),and mature poplar plantation(MP)in coastal area of the northern Jiangsu Province.The results showed that except for the surface(0-10 cm)soil in MP,the SIC content was higher than SOC in all soil horizons.Overall,neither the soil PC to SIC ratio nor the SIC storage were significantly different in SA and SS soils.Compared to wetland soils(0-40 cm),the soil PC to SIC ratio was reduced by 32.7%and 54.1%and the PC storage was reduced by 40.5%and 59.2%,the lithogenic carbonate(LC)storage changed little,while the SIC storage was reduced by 21.0%and 17.9%,respectively in the YP and MP soils.Compared to the YP soils(0-100 cm),both the soil PC to SIC ratio and the PC storage were significantly reduced while the LC storage was significantly increased,especially at the 41-100 cm soil horizons,meanwhile,the SIC storage was not significantly changed in the MP soils.Results of the structural equation modeling(SEM)indicated that key factors influencing soil PC storage were the ratio of PC to SIC,followed by the SOC content and bulk density.SOC could inhibit the formation of soil PC.Generally,the coastal wetlands have greater SIC storage and sequestration potential than poplar plantations,and the PC sequestration can be regulated by modulating the ratio of PC to SIC and SOC content.
作者
卢伟伟
杨佳
lu Weiwei;YANG Jia(College of Ecology and Environment,Nanjing Forestry University,Nanjing 210037,China;Co-Innovation Center for Sustainable Forestry in Southern China,Nanjing Forestry University,Nanjing 210037,China)
出处
《应用生态学报》
CAS
CSCD
北大核心
2024年第8期2131-2140,共10页
Chinese Journal of Applied Ecology
基金
淮安市自然科学研究项目(HAB202164)
国家自然科学基金项目(41701264)资助。
关键词
无机碳
成土碳酸盐
成岩碳酸盐
碳储量
人工林
滨海湿地
inorganic carbon
pedogenic carbonate
lithogenic carbonate
carbon storage
plantation
coastal Wetland
