林业科学Issue(6)：18-27,10.DOI:10.11707/j.1001-7488.20140603
红松针阔混交林林隙土壤颗粒有机碳和矿物结合有机碳的时空异质性*
Spatiotemporal Heterogeneity of Soil Particulate and Mineral-Associated Organic Carbon of Forest Gaps in Pinus koraiensis Coniferous and Broad-Leaved Mixed Forest
摘要
Abstract
Three representative forest gaps were selected as experimental plots in Pinus koraiensis coniferous and broad-leaved mixed virgin forest in Liangshui National Nature Reserve, Dailing District, Yichun, Heilongjiang Province. Sampling points were set up by the grid method,the contents of soil particulate organic carbon ( POC ) and mineral-associated organic carbon ( MOC ) in surface soil layer ( 0 -20 cm ) were periodically measured from June to October during the growing season. Spatiotemporal heterogeneity of POC and MOC were analyzed by the methods of traditional statistics and geostatistics. The results showed that: soil POC and MOC changed significantly over months. Both of them roughly exhibited the following tendency,i. e. ,first increasing,then decreasing,after obviously increasing,but the change of MOC lagged behind the change of POC; Both of soil POC ( coefficient of variation ranged from 50. 5% to 94. 4%) and MOC( coefficient of variation ranged from 21. 0%to 61. 0%) had spatial heterogeneity,their variability fell into moderately spatial variability; Variance analysis showed that month had highly significant influences on soil POC and MOC(P<0. 01). The forest gap size had highly significant effect(P<0. 01) on the former,but no significant impact on the latter ( P > 0. 05 ); According to the proportion [C/( C0 + C ) ], both of POC and MOC had strongly spatial autocorrelation that was mainly caused by structural factors; Contour maps indicated that POC and MOC in surface soil layer had the characteristics of patchy or continuous distribution; Soil POC was lower in the forest gap center or near the center,patchy distribution was relatively obvious. The distributions of MOC were more even than that of POC,and low-value centers mostly distributed on the edge of forest gaps; The spatial distribution pattern of MOC over different months was relatively stable compared with that of POC.关键词
红松针阔混交林/林隙/土壤颗粒有机碳/土壤矿物结合有机碳/时空异质性Key words
Pinus koraiensis coniferous and broad-leaved mixed forest/forest gap/soil particulate organic carbon/mineral-associated organic carbon/spatiotemporal heterogeneity分类
农业科技引用本文复制引用
石亚攀,乔璐,陈立新,段文标,张雪,徐非,刘晓锐..红松针阔混交林林隙土壤颗粒有机碳和矿物结合有机碳的时空异质性*[J].林业科学,2014,(6):18-27,10.基金项目
国家自然科学基金项目(31270666) （31270666）
东北林业大学大学生创新创业计划训练项目(1110225014)。 （1110225014）
