朱晓武, 吴悦宏, 肖泽鑫, 纪燕玲, 林文欢, 范镇贞. 粤东地区红树林土壤养分及生态化学计量特征[J]. 土壤通报, 2024, 55(5): 1345 − 1354. DOI: 10.19336/j.cnki.trtb.2023083001
引用本文: 朱晓武, 吴悦宏, 肖泽鑫, 纪燕玲, 林文欢, 范镇贞. 粤东地区红树林土壤养分及生态化学计量特征[J]. 土壤通报, 2024, 55(5): 1345 − 1354. DOI: 10.19336/j.cnki.trtb.2023083001
ZHU Xiao-wu, WU Yue-hong, XIAO Ze-xin, JI Yan-ling, LIN Wen-huan, FAN Zhen-zhen. Characterization of Soil Nutrients and Ecological Stoichiometry of Mangrove Forests in Eastern Guangdong[J]. Chinese Journal of Soil Science, 2024, 55(5): 1345 − 1354. DOI: 10.19336/j.cnki.trtb.2023083001
Citation: ZHU Xiao-wu, WU Yue-hong, XIAO Ze-xin, JI Yan-ling, LIN Wen-huan, FAN Zhen-zhen. Characterization of Soil Nutrients and Ecological Stoichiometry of Mangrove Forests in Eastern Guangdong[J]. Chinese Journal of Soil Science, 2024, 55(5): 1345 − 1354. DOI: 10.19336/j.cnki.trtb.2023083001

粤东地区红树林土壤养分及生态化学计量特征

Characterization of Soil Nutrients and Ecological Stoichiometry of Mangrove Forests in Eastern Guangdong

  • 摘要:
    目的 探讨粤东地区红树林土壤养分的变化规律,为粤东地区红树林的科学经营管理提供理论依据。
    方法 选取粤东地区6种典型的红树林群落为研究对象,采用单因素方差分析和相关性分析相结合的方法,测定不同群落类型0 ~ 30 cm土层土壤的有机质(SOM)、有机碳(SOC)、全氮(TN)、全磷(TP)、全钾(TK)、碱解氮(AN)、有效磷(AP)和速效钾(AK)含量并计算其化学计量比,再采用内梅罗指数法对各群落类型土壤肥力进行综合评价。
    结果 不同群落类型红树林土壤养分具有一定的差异,总体表现为无瓣海桑(Sonneratia apetala) + 秋茄(Kandelia obovata) + 桐花(Aegiceras corniculatum) + 卤蕨(Acrostichum aureum)、无瓣海桑 + 桐花 + 秋茄 + 海桑(Sonneratia caseolaris)以及无瓣海桑 + 海桑3种群落类型土壤养分含量较高。土壤C∶N、C∶P和N∶P平均值分别为18.39、88.20和4.76,其中C∶N和C∶P平均值高于全国土壤平均水平,N∶P平均值低于全国土壤平均水平。研究区除桐花群落易受P的限制,其余5种类型易受到N的限制。土壤综合肥力系数表现为:无瓣海桑 + 海桑(2.08) > 无瓣海桑 + 桐花 + 秋茄 + 卤蕨(2.02) > 无瓣海桑 + 秋茄 + 桐花 + 海桑(2.01) > 秋茄(1.75) > 无瓣海桑(1.70) > 桐花(1.41),土壤综合肥力平均系数为1.83。相关性分析表明,土壤SOC与TN呈极显著正相关(P < 0.01),不同群落类型土壤养分含量及化学计量比之间的相关性存在一定的差异。
    结论 粤东地区红树林湿地土壤的综合肥力水平较好,而红树林植被的生长总体表现为易受土壤氮的限制,在后续的红树林营造和修复中,应优先考虑采用多物种的混交模式,以维持红树林的可持续发展。

     

    Abstract:
    Objective The aim was to explore the changing law of soil nutrients in mangrove forests in the eastern part of Guangdong.
    Method Soil samples of 0 ~ 30 cm layers were collected respectively in 6 typical mangrove communities. The nutrient indices including organic matter (SOM), organic carbon (SOC), total nitrogen (TN), total phosphorus (TP), total potassium (TK), available nitrogen (AN), available phosphorus (AP), available potassium (AK) and stoichiometric ratios of soils under different community types were determined. One-way analysis of variance (ANOVA) and correlation analysis were used to analyze the differences and correlations between different communities and indices. The nemerow index method was used to comprehensively evaluate the soil fertility of different community types.
    Result There were certain differences in soil nutrients among different community types, which were generally manifested as higher soil nutrient content in three community types: S. apetala + A. corniculatum + K. obovate + A. aureum, S. apetala + A. corniculatum + K. obovate + S. caseolaris, and S. apetala + S. caseolaris. The average values of the soil C∶N, C∶P, and N∶P were 18.39, 88.20 and 4.76, respectively. The average values of C∶N and C∶P were higher than the national average level, while the N∶P was lower than it. Except for the community of A. corniculatum in the study area which were susceptible to P limitation, the other 5 types were susceptible to N limitation. Soil comprehensive fertility coefficients showed a trend of S. apetala + S. caseolaris (2.08) > S. apetala + A. corniculatum + K. obovate + A. aureum (2.02) > S. apetala + A. corniculatum + K. obovate + S. caseolaris (2.01) > K. obovata (1.75) > S. apetala (1.70) > A. corniculatum (1.41), and the average coefficient of comprehensive fertility was 1.83. Correlation analysis showed that SOC and TN were highly significantly and positively correlated (P < 0.01), and there were some differences between soil nutrient indices and stoichiometric ratios under different community types.
    Conclusion The comprehensive fertility level of mangrove wetland soils in the eastern part of Guangdong was relatively good. The growth of mangrove vegetation was easily limited by N. In the subsequent mangrove creation and restoration, a multi-species mixing pattern should be considered to maintain the sustainable development of mangrove forests.

     

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