四川农业大学学报 ›› 2014, Vol. 32 ›› Issue (04): 362-368.doi: 10.3969/j.issn.1000-2650.2014.04.002

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官司河流域土壤有机碳密度和储量研究

任姝婷, 宫渊波, 郑江坤, 付万权, 徐雄才   

  1. 四川农业大学林学院, 四川 雅安 625014
  • 收稿日期:2014-09-15 出版日期:2014-12-31 发布日期:2017-02-28
  • 通讯作者: 宫渊波,教授,博士生导师,主要从事水土保持和生态恢复的教学和科研工作,E-mail:gyb@sicau.edu.cn。 E-mail:gyb@sicau.edu.cn
  • 作者简介:任姝婷,硕士研究生。
  • 基金资助:
    国家"十二五"科技支撑计划重大项目"长江上游低山丘陵区生态综合整治技术与示范"(2011BAC09B05);四川农业大学创新团队项目(林业生态工程)

Soil Organic Carbon Density and Storage in the Guansi Basin

REN Shu-ting, GONG Yuan-bo, ZHENG Jiang-kun, FU Wan-quan, XU Xiong-cai   

  1. College of Forestry, Sichuan Agricultural University, Yaan 625014, Sichuan, China
  • Received:2014-09-15 Online:2014-12-31 Published:2017-02-28

摘要: [目的] 研究官司河流域内不同植被覆盖和不同坡位下0~40 cm深度土壤有机碳(SOC)密度和碳储量。[方法] 选取流域内5种典型植被类型上、中、下坡位的土壤,分别测定0~20 cm、20~40 cm深度SOC含量,并根据森林资源二类调查资料量化其区域的SOC储量。[结果] 植被类型、坡位和土层对小流域不同SOC含量有显著影响。SOC含量随土层深度的增加而递减;针叶纯林、经济林的SOC含量与坡位呈显著负相关(相关系数r分别为-0.731和-0.859),而林种结构复杂的针阔混交林和针针混交林没有显著的相关关系。0~40 cm SOC含量为:经济林(10.21 g/kg) > 针叶纯林(9.21 g/kg) > 针阔混交林(9.15 g/kg) > 农耕地(8.97 g/kg) > 针针混交林(7.21 g/kg),整个流域0~40 cm SOC储量为8.88×104 t。[结论] 纯林(包括经济林、针叶纯林)相较混交林SOC含量较高;合理择伐,提高人工林植物多样性和土壤有机质含量是增加土壤有机碳储量的有效措施;人为干扰是导致该流域天然次生林土壤SOC储量降低的主要原因。因此,加强人工林管理和天然次生林的保护,使其免受人为干扰是提高官司河流域土壤有机碳储量的有效措施。

关键词: SOC含量, 植被类型, 坡向, 官司河流域

Abstract: [Objective] The aim of the study was to determine soil organic carbon (SOC) and storage at the depth of 40 cm in different vegetation types and slope positions. [Method] Soils (0-20 cm and 20-40 cm)on different slope positions of five vegetation types in the basin were sampled to determined SOC content.Additionally,according to forest resources investigation data,SOC density and storage was calculated. [Results] SOC content showed significant differences among vegetation types,slope positions and soil layers.SOC content decreased with increase in soil depth.SOC content in coniferous forests and economic forests were significantly negatively correlated with slope positions (r=-0.731 and r=-0.859).However,no significant correlation was found in theropencedrymion and mixed coniferous forest.SOC content at the depth of 40 cm followed the order:economic plantation (10.21 g/kg) > coniferous forest (9.21 g/kg) > theropencedrymion (9.15 g/kg) > farmland (8.97 g/kg) > mixed coniferous forest (7.21 g/kg).The soil organic carbon storage in the basin was 8.88×104 t. [Conclusion] SOC content in mixed forests were lower compared to pure forests (coniferous forests and economic forests).Rationally cutting,improving plant diversity and soil organic matter may be effective measures to increaseSOC storage.Human disturbance is the main reason to reduce SOC storage of natural secondary forest in the basin.Therefore,in order to improve SOC storage in the Guansi basin,protecting natural secondary forest from human disturbance and strengthening plantation management would be efficient measures.

Key words: soil organic carbon storage, vegetation types, slope positions, Guansi basin

中图分类号: 

  • S153