钦州湾红树林土壤肥力及其C、N、P、K化学计量特征
发布时间：2018-11-21 16:01
【摘要】：为了研究广西钦州湾红树林的土壤特性,在该区域内选取9个具有代表性的红树林群落进行样方调查和样品采集,分析测试土壤有机质、速效N、速效P、速效K、pH值、全盐量和土壤容重等7个指标,并计算分析土壤肥力系数和C、N、P、K生态化学计量比。结果表明,红树林泥质型土壤容重较轻且呈酸性,pH值3.8~5.6,但沙质、沙泥质型土壤接近中性,pH值为7.2~7.6。红树林土壤含盐量高,平均为16.3g·kg~(-1),有机质、速效N、速效P、速效K的含量丰富,平均值分别为31.6g·kg~(-1)、93.1mg·kg~(-1)、11.6mg·kg~(-1)、545.9mg·kg~(-1),且不同类型之间存在显著差异(P0.05)。红树林土壤综合肥力系数(P_j)变化范围为1.09~1.99,平均值为1.43±0.29,其中类型4白骨壤纯林(泥质土)的土壤P_j最大,属于肥沃(1.8≤P_j2.7),其他类型的土壤均属于一般水平(0.9≤P_j1.8),表明红树林土壤肥力一般偏肥沃、不贫瘠,而速效N是影响红树林土壤肥力的主要因素。红树林土壤的生态化学计量比C/N、C/P、C/K、N/P平均值分别为203.1、1 779.4、41.0、9.1,不同类型之间差异显著,表明不同类型的红树林对土壤养分的分配利用不同。
[Abstract]:In order to study the soil characteristics of mangroves in Qinzhou Bay, Guangxi, 9 representative mangrove communities were selected for sample investigation and sample collection, and soil organic matter, available N, available P and available K ~ + pH value were analyzed and tested. The soil fertility coefficient and the ecological stoichiometric ratio of C ~ (2 +) N ~ (2 +) P ~ (1 +) K were calculated and analyzed according to seven indexes, such as total salt content and soil bulk density. The results showed that the bulk density of mangrove muddy soil was light and acidic, the pH value was 3.80.6.But the sandy and sandy muddy soil was close to neutral, and the pH value was 7.2c7.6. The average salt content of mangrove soil was 16.3 g kg~ (-1), and the contents of organic matter, available N, available P, available K were rich, the average values were 31.6 g kg~ (-1), 93.1mg kg~ (-1), respectively. 11.6mg kg~ (-1), 545.9mg kg~ (-1), and there were significant differences among different types (P0.05). The variation range of soil comprehensive fertility coefficient of mangrove soil is 1.09 ~ 1.99, and the average value is 1.43 卤0.29. The soil PJ of pure forest (muddy soil) of 4 types of white bone soil is the largest, which belongs to fertile (1. 8 鈮，
本文编号：2347446
[Abstract]:In order to study the soil characteristics of mangroves in Qinzhou Bay, Guangxi, 9 representative mangrove communities were selected for sample investigation and sample collection, and soil organic matter, available N, available P and available K ~ + pH value were analyzed and tested. The soil fertility coefficient and the ecological stoichiometric ratio of C ~ (2 +) N ~ (2 +) P ~ (1 +) K were calculated and analyzed according to seven indexes, such as total salt content and soil bulk density. The results showed that the bulk density of mangrove muddy soil was light and acidic, the pH value was 3.80.6.But the sandy and sandy muddy soil was close to neutral, and the pH value was 7.2c7.6. The average salt content of mangrove soil was 16.3 g kg~ (-1), and the contents of organic matter, available N, available P, available K were rich, the average values were 31.6 g kg~ (-1), 93.1mg kg~ (-1), respectively. 11.6mg kg~ (-1), 545.9mg kg~ (-1), and there were significant differences among different types (P0.05). The variation range of soil comprehensive fertility coefficient of mangrove soil is 1.09 ~ 1.99, and the average value is 1.43 卤0.29. The soil PJ of pure forest (muddy soil) of 4 types of white bone soil is the largest, which belongs to fertile (1. 8 鈮，
本文编号：2347446
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