WANG Fei,MA Ruihao,XIA Kai,et al.Response of Soil Labile Organic Carbon Fractions to Forest Conversions[J].Research of Soil and Water Conservation,2023,30(01):233-240.[doi:10.13869/j.cnki.rswc.2023.01.021]
森林转换对土壤活性有机碳组分的影响
- Title:
- Response of Soil Labile Organic Carbon Fractions to Forest Conversions
- 文章编号:
- 1005-3409(2023)01-0233-08
- 分类号:
- S714.2
- 文献标志码:
- A
- 摘要:
- 为了研究林型转换对土壤活性有机碳组分的影响,在安徽皖南地区蔡家桥林场选取了马尾松次生林、湿地松人工林以及杉木人工林3种森林类型,分别采集了0—10,10—30,30—50 cm的土壤,测定了土壤有机碳(SOC)、颗粒有机碳(POC)、易氧化有机碳(EOC)、微生物生物量碳(MBC)、可溶性有机碳(DOC)以及土壤理化指标,分析了林型转换后土壤活性有机碳组分变化特征及其与土壤理化因子间的相关关系。结果表明:(1)马尾松次生林转换成湿地松人工林和杉木人工林后主要对0—10 cm土壤活性有机碳组分产生影响,其中土壤SOC,POC,EOC含量均在林型转换后出现下降,DOC含量上升,而MBC在林型转换前后无显著差异。(2)林型转换后各土层POC/SOC均出现下降,DOC和EOC占SOC比例总体呈升高趋势,MBC/SOC则未表现出明显规律。(3)土壤有机碳与活性碳组分以及TN,EC,NH+4-N,NO-3-N均呈极显著正相关,各活性碳组分之间也存在极显著正相关关系(p<0.01)。综上,马尾松次生林转换成湿地松人工林和杉木人工林主要导致了表层土壤有机碳的流失及其稳定性下降,影响了表层土壤活性有机碳含量,对深层土壤有机碳及其活性组分影响较小,这可能是由于不同林型、微生物活性和管理干扰等多种因素的综合作用。
- Abstract:
- In order to study the effect of forest type conversion on soil active organic carbon components, three forest types, Pinus massoniana secondary forest, P. ellimattii plantation and Cunninghamia lanceolata plantation, were selected in Caijiaqiao Forest Farm in southern Anhui Province. The samples were collected from soil depths of 0—10 cm, 10—30 cm and 30—50 cm, respectively. The soil organic carbon(SOC), particulate organic carbon(POC), easily-oxidized organic carbon(EOC), microbial biomass carbon(MBC), dissolved organic carbon(DOC)and physicochemical properties were determined. The change characteristics of soil organic carbon components after forest type transformation and their relationship with soil physicochemical factors were analyzed. The results showed that:(1)the conversion of P. massonensis secondary forest to P. elliottii plantation and C. lanceolata plantation mainly affected the soil active organic carbon components in 0—10 cm soil layer; the SOC, POC and EOC contents in soil decreased after the conversion, and DOC content increased, while MBC had no significant differences before and after the conversion;(2)after forest type conversion, the proportion of POC to SOC in each soil layer decreased, while the proportions of DOC and EOC to SOC increased; the proportion of MBC to SOC did not show obvious regularity;(3)there were significant positive correlations between SOC and active carbon components, as well as TN, EC, NH+4-N and NO-3-N, and there were also extremely significant positive correlations among the labile organic carbon fractions. From what has been discussed above, the conversion of P. massoniana secondary forest to P. elliottii plantation and C. lanceolata plantation mainly resulted in SOC loss and its stability decrease in surface soil layer, had little effect on SOC and its active components in the deep soil layer due to the comprehensive effects of such factors as different forest types, microbial activities and management interferences.
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备注/Memo
收稿日期:2021-11-08 修回日期:2021-11-25
资助项目:国家“十三五”重点研发计划项目“一般产区杉木林土壤肥力维持与健康可持续经营的林地管理技术研究”(2016YFD0600304-03)
第一作者:王斐(1997—),男,安徽安庆人,在读硕士研究生,主要从事森林生态及复合经营研究。E-mail:wangfei014714@163.com
通信作者:徐小牛(1961—),男,安徽庐江人,教授,博士生导师,主要从事森林培育及森林生物地球化学研究。E-mail:xnxu2007@ahau.edu.cn