长白山不同海拔原始红松林土壤活性有机碳含量的生长季动态

刘明慧; 孙雪; 于文杰; 秦立武; 冯富娟&#xE

doi:10.3969/j.issn.1000-2006.201706040

刘明慧,孙雪,于文杰,秦立武,冯富娟1

南京林业大学学报（自然科学版） ›› 2018, Vol. 42 ›› Issue (02) : 67-74.

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南京林业大学学报（自然科学版） ›› 2018, Vol. 42 ›› Issue (02) : 67-74. DOI: 10.3969/j.issn.1000-2006.201706040

研究论文

长白山不同海拔原始红松林土壤活性有机碳含量的生长季动态

刘明慧¹,孙雪¹,于文杰²,秦立武²,冯富娟¹

作者信息 +

Seasonal dynamics of soil active organic carbon content in the original Pinus koraiensis forest in Changbai Mountains, China

LIU Minghui¹, SUN Xue¹,YU Wenjie²,QIN Liwu², FENG Fujuan^1*

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摘要

【目的】研究长白山原始红松林土壤可溶性有机碳(dissolved organic carbon, DOC)、微生物生物量碳(microbial biomass carbon, MBC)、易氧化碳(easily oxidized organic carbon, EOC)的含量随海拔变化的垂直地带性规律、生长季动态及差异机制。【方法】以长白山海拔699～1 177 m的原始红松阔叶林为对象,以100 m为间隔选择原始红松林,同一海拔设置3块重复样地,在每个样地内选取10个随机观察样方(15 cm×15 cm)。分析0～20 cm表层土中土壤3种活性有机碳的含量随海拔及生长季的动态变化。【结果】原始红松林土壤DOC含量随海拔升高而增大,EOC含量除在1 177 m处较低外,在海拔699～1 044 m间整体上呈现出高海拔处大于低海拔的趋势; MBC含量仅在5、6月表现为低海拔处大于高海拔,其他月份也呈现出与EOC相同的规律。3种活性有机碳占土壤总有机碳(total organic carbon, TOC)比例分别在0.10%～1.45%、0.08%～2.18%和5.20%～69.18%之间,随海拔变化规律与其含量变化规律相似。在5—10月的生长季内,3种土壤活性有机碳含量及占TOC比例在月份间差异显著(P<0.05)。土壤DOC含量最高值出现在9月,MBC含量在6月和9月较高,EOC含量的最高值则出现在5月和6月。土壤活性有机碳各组分含量与土壤有效氮、有效磷、有效钾、pH、含水率、容重的相关性均达到显著水平(P<0.05),且与土壤含水率的相关性最强(r = 0.835)。【结论】处于海拔699～818 m间原始红松林的土壤有机碳库稳定性更高,土壤碳汇功能更强。土壤碳素的积累主要发生在5、7、8、10月,此期TOC分解速度较慢,土壤碳汇功能更强。森林土壤活性有机碳含量可作为衡量土壤中N、P、K动态变化的敏感性指标。

Abstract

【Objection】In this study, the vertical zonal regularity with altitude and growth seasonal variation of the contents of soil dissolved organic carbon(DOC), microbial biomass carbon(MBC)and easily oxidized carbon(EOC)in the surface soil was investigated. The results provide a basis for the scientific evaluation of the stability of the soil carbon pool and the potential function of carbon sequestration in the original P. koraiensis forest, which is of great practical significance in the context of global climate change.【Method】We selected the original Pinus koraiensis-broadleaved mixed forest in Changbai Mountain(from 699 to 1 177 m)as a research object, and selected sample plots at 100 m intervals. At the same altitude, three sample plots were set, and a total of 10 sampling points with a size of 15 cm × 15 cm were randomly set up in an “S” shape at each plot. The contents of DOC, MBC and EOC in the surface soil(0-20 cm)were analyzed by using potassium sulfate extraction, chloroform fumigation extraction and potassium permanganate oxidation methods, respectively, to study the dynamic variations in altitude and growing seasons. 【Result】 We found the contents of DOC increased with altitude, the contents of EOC showed a trend of higher contents at altitudes of 699-1 044 m, although a lower content was observed at 1 177 m, and MBC exhibited the same pattern as EOC but in May and June. The three components accounted for 0.10%-1.45%, 0.08%-2.18% and 5.20%-69.18% of the TOC, respectively. Contents of the three active organic carbons and their proportions accounting for TOC changed obviously during the growing season(from May to October), with significant differences between months(P<0.05). The DOC content was higher in September, the MBC content was higher in June and September, and the EOC contents was the highest in May and June. The contents of all the three components were significantly correlated with available mineral nutrients(nitrogen, phosphorus, and potassium), pH, bulk density and water content of the soil samples(P<0.05), of which the correlation with water content was the highest(r = 0.835). 【Conclusion】The above results imply that the P. koraiensis forest at 699-818 m has a higher soil organic carbon pool stability and stronger soil carbon sink capacity. The accumulation of soil carbon mainly occurred in May, July, August and October, indicating a higher soil carbon sink capacity during this period. In general, the content of soil active organic carbon in the forest soil could be used as a sensitivity index to measure dynamic changes in forest soil nutrients(N, P and K).

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刘明慧,孙雪,于文杰,秦立武,冯富娟1. 长白山不同海拔原始红松林土壤活性有机碳含量的生长季动态[J]. 南京林业大学学报（自然科学版）. 2018, 42(02): 67-74 https://doi.org/10.3969/j.issn.1000-2006.201706040

LIU Minghui, SUN Xue,YU Wenjie,QIN Liwu, FENG Fujuan. Seasonal dynamics of soil active organic carbon content in the original Pinus koraiensis forest in Changbai Mountains, China[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2018, 42(02): 67-74 https://doi.org/10.3969/j.issn.1000-2006.201706040

中图分类号： S718

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