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(P<0.05)。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_j<2.7),其他类型的土壤均属于一般水平(0.9≤P_j<1.8),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。
In order to understand soil characteristics of mangroves,based on the data of 7 indexes,including soil organic matter, available N, P, K, pH-value, total salt content and bulk density, the soil fertility and C, N,P,K ecological stoichiometry of 9 mangrove types were analyzed in Qinzhou Bay,Guangxi. The results showed that mangrove muddy soils were those with light bulk density and highly acidie,pH values ranged from 3.8 to 5.6,whereas mud sandy and sandy soils were neutral,pH values were from 7.2~7.6. Salt lev- els were high with an average of 16.3 g/kg. The contents of organic matter, available N,P,K were rich, with mean values of 31.6 g/kg,93.1 mg/kg,11.6 mg/kg,and 545.9 mg/kg,respectively. There were sig nificant differences among different mangrove types （P〈0. 05）. The range of comprehensive fertility cod ficient （Pj） of soil was 1.09~1.99 （with the mean value of 1.43±0.29） ,in which the soil of Avicennia marina pure forest （type 4） was in the highest level,belonging to fertile rank （1.8≤P〈2.7） ,while other soil types were in the middle level （0.9≤Pj〈1. 8）. It indicated Rat soil fertility of mangroves in Qinzhou Bay was effective and not barren,but available N was the limiting factor. Utilization of soil nutrients by different mangrove plants was different. The ratios of key soil nutrients for C/N,C/P,C/K,and N/P were 203. ], 1 779.4,41.0,and 9.1 ,respectively. There were significant differences among different mangrove types.
出处
《西北林学院学报》
CSCD
北大核心
2017年第6期119-124,149,共7页
Journal of Northwest Forestry University
基金
广西壮族自治区自然科学基金(2014GXNSFBA118073)
自治区直属公益性科研院所专项(林科201606号)
关键词
红树林
土壤肥力
化学计量比
有机质
mangrove
soil fertility
ecological stoichiometry ratio
organic matter
