[1]DU Hao,ZHANG Chengfu,CHENG Yuqi,et al.Change Characteristics of Dissolved Organic Carbon (DOC) in Natural Forests of Greater Khingan Mountains Region[J].Research of Soil and Water Conservation,2019,26(06):46-52.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
26
Number of periods:
2019 06
Page number:
46-52
Column:
Public date:
2019-10-17
- Title:
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Change Characteristics of Dissolved Organic Carbon (DOC) in Natural Forests of Greater Khingan Mountains Region
- Author(s):
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DU Hao, ZHANG Chengfu, CHENG Yuqi, WANG Yuqing, PAN Sihan, YANG Yuna
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College of Desert Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010010, China
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- Keywords:
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Greater Khingan Mountains; stemflow; organic matter layer; soil; dissolved organic carbon (DOC)
- CLC:
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S714.2
- DOI:
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- Abstract:
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In order to determine the effects of different forest stands and seasonal changes on forest carbon pool, the representative stands of Birch forest, Birch forest and Larix gmelinii mixed forests and Larix gmelinii forests were selected in Genhe Forestry Bureau of Greater Khingan Mountains region, Inner Mongolia. Dissolved organic carbon (DOC) concentrations in stemflow, organic matter layer and 0-30 cm soil layer were collected and measured. The variation characteristics of DOC and the effects of different months on DOC were analyzed. The results show that the average concentrations of DOC in stemflow of different stands are 60.12, 172.77, 205.02, 35.32, 39.64, 34.45 mg/L in organic matter layer, 26.23 mg/L, 37.08 mg/L, 26.53 mg/L in 0-30 cm soil layer, respectively. DOC concentration in different stands decreases in the order:stemflow > organic layer > 0-30 cm soil layer, and the DOC concentration in stemflow of Larix gmelinii forest is significantly higher than that of Birch forest forest (p<0.05), and the DOC concentration in the trunk of Larix gmelinii forest is higher than that in the trunk of Birch forest. DOC concentrations of the organic layer and 0-30 cm soil layer in different stands decrease in the order:Mixed forest of larch and birch>Birch forest and Larix gmelinii forest, but there is no significant difference (p>0.05). Organic and soil layers can adsorb and fix DOC. The concentration of DOC in stemflow increases first and then decreases from June to September and reaches the maximum in July. The concentration of DOC reaches the highest in June in organic layer and 0-30 cm soil layer, the lowest in July and August, and then increases in September. The variation of DOC concentration in different stands and months affects the distribution characteristics of DOC concentrations in natural forests.