Biomass and Production Rates of Fine Roots in Two Mangrove Stands in Southern Thailand

IF 0.5 4区农林科学 Q4 AGRICULTURE, MULTIDISCIPLINARY

Jarq-japan Agricultural Research Quarterly Pub Date : 2020-10-01 DOI:10.6090/JARQ.54.349

K. Noguchi, S. Poungparn, Suthathip Umnouysin, P. Patanaponpaiboon, D. Duangnamol, R. Yoneda, H. Utsugi, Tamotsu Sato, R. Tabuchi

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引用次数: 4

Abstract

Fine roots are a key component of belowground carbon dynamics in forest ecosystems. However, information on fine root dynamics in mangrove forests is still limited. Therefore, in this study we examined the biomass and production rates of fine roots by using soil coring and an ingrowth core method, respectively, at soil depths of 0 cm-40 cm in Avicennia alba and Rhizophora apiculata stands in Ranong Province, southern Thailand. In these stands, the fine root biomass was ca. 3.4 kg m−2 and 1.4 kg m−2, respectively, while fine root production rates were ca. 450 g m−2 year−1 and 740 g m−2 year−1, respectively. Fine root biomass was not significantly different between the surface (0 cm20 cm) and subsurface (20 cm-40 cm) soil in both stands. The fine root production rate was also similar between the soil layers in the R. apiculata stand, whereas it decreased with soil depth in the A. alba stand. The patterns of vertical distribution of fine root production rates probably reflected the species characteristics of A. alba and R. apiculata, and suggested that fine root production in the subsurface soil contributes significantly to belowground carbon dynamics, especially in R. apiculata. Discipline: Forestry Additional key words: Avicennia alba, ingrowth core, Rhizophora apiculata, soil depth, vertical distribution

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泰国南部两个红树林林分细根生物量和产量

细根是森林生态系统地下碳动态的重要组成部分。然而，关于红树林细根动态的信息仍然有限。因此，本研究在泰国南部拉廊省的白杨(Avicennia alba)林分和尖根(Rhizophora apiculata)林分土壤深度为0 cm ~ 40 cm的条件下，分别采用土壤芯法和长入芯法测定了细根生物量和产量。这些林分的细根生物量分别约为3.4 kg m−2和1.4 kg m−2，而细根生长率分别约为450 g m−2和740 g m−2。两种林分表层(0 cm ~ 20 cm)和地下(20 cm ~ 40 cm)细根生物量差异不显著。细根生长率在尖叶松林分的土层间也基本一致，而在白叶松林分则随土层深度的增加而降低。细根生长速率的垂直分布格局可能反映了白杨和尖叶蒿的物种特征，表明地下土壤细根生长对地下碳动态有显著贡献，尤其是尖叶蒿。附加关键词:白杨，长生核心，尖根霉，土壤深度，垂直分布

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来源期刊

Jarq-japan Agricultural Research Quarterly 农林科学-农业综合

CiteScore

1.00

自引率

25.00%

发文量

审稿时长

>36 weeks

期刊介绍： The Japan Agricultural Research Quarterly (JARQ) is a publication of the Japan International Research Center for Agricultural Sciences (JIRCAS), which provides readers overseas with the latest information on key achievements and developments in agricultural research in Japan, with the expectation that this information would contribute to the agricultural development of countries in tropical and subtropical regions.