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Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (6): 18-27.doi: 10.11707/j.1001-7488.20140603

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Spatiotemporal Heterogeneity of Soil Particulate and Mineral-Associated Organic Carbon of Forest Gaps in Pinus koraiensis Coniferous and Broad-Leaved Mixed Forest

Shi Yapan1, Qiao Lu1,2, Chen Lixin1, Duan Wenbiao1, Zhang Xue1, Xu Fei1, Liu Xiaorui1   

  1. 1. College of Forestry, Northeast Forestry University Harbin 150040;
    2. College of Pharmacy, Henan University of Traditional Chinese Medicine Zhengzhou 450008
  • Received:2012-02-23 Revised:2014-05-07 Online:2014-06-25 Published:2014-07-07
  • Contact: 陈立新

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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.

Key words: Pinus koraiensis coniferous and broad-leaved mixed forest, forest gap, soil particulate organic carbon, mineral-associated organic carbon, spatiotemporal heterogeneity

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