【摘要】：為了研究廣西欽州灣紅樹林的土壤特性,在該區(qū)域內(nèi)選取9個(gè)具有代表性的紅樹林群落進(jìn)行樣方調(diào)查和樣品采集,分析測(cè)試土壤有機(jī)質(zhì)、速效N、速效P、速效K、pH值、全鹽量和土壤容重等7個(gè)指標(biāo),并計(jì)算分析土壤肥力系數(shù)和C、N、P、K生態(tài)化學(xué)計(jì)量比。結(jié)果表明,紅樹林泥質(zhì)型土壤容重較輕且呈酸性,pH值3.8~5.6,但沙質(zhì)、沙泥質(zhì)型土壤接近中性,pH值為7.2~7.6。紅樹林土壤含鹽量高,平均為16.3g·kg~(-1),有機(jī)質(zhì)、速效N、速效P、速效K的含量豐富,平均值分別為31.6g·kg~(-1)、93.1mg·kg~(-1)、11.6mg·kg~(-1)、545.9mg·kg~(-1),且不同類型之間存在顯著差異(P0.05)。紅樹林土壤綜合肥力系數(shù)(P_j)變化范圍為1.09~1.99,平均值為1.43±0.29,其中類型4白骨壤純林(泥質(zhì)土)的土壤P_j最大,屬于肥沃(1.8≤P_j2.7),其他類型的土壤均屬于一般水平(0.9≤P_j1.8),表明紅樹林土壤肥力一般偏肥沃、不貧瘠,而速效N是影響紅樹林土壤肥力的主要因素。紅樹林土壤的生態(tài)化學(xué)計(jì)量比C/N、C/P、C/K、N/P平均值分別為203.1、1 779.4、41.0、9.1,不同類型之間差異顯著,表明不同類型的紅樹林對(duì)土壤養(yǎng)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 鹵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，

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