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南亚热带桉树人工林与典型乡土树种人工林土壤磷组分及磷吸附特性比较
郑 威1, 李晨曦1, 谭 玲1, 明安刚2, 何友均3, 覃 林4
1.广西大学林学院;2.中国林业科学研究院热带林业实验中心;3.中国林业科学研究院林业科技信息研究所;4.广西大学林学院,广西森林生态与保育重点实验室
摘要:
土壤磷是制约南亚热带人工林生产力的关键因子,但至今对该地区不同树种人工林土壤磷组分及吸附特征知之甚少。本文研究了位于广西凭祥市的中国林业科学研究院热带林业实验中心的外来速生桉树人工林和典型乡土树种(马尾松、红椎)人工林不同土壤层次中(0 ~ 20、20 ~ 40 和 40 ~ 60 cm)磷组分含量及吸附性能。结果表明,3 种林分土壤有机磷是全磷的主要形态,其含量(91.51 ~ 257.45 mg/kg)占 全磷 的 46.25% ~ 71.58%。桉树林土壤 全磷、有机磷 和无机磷含量明显低于马尾松林和红椎林。同时,桉树人工林土壤活性有机磷含量显著高于 2 种乡土树种人工林,而其土壤磷酸铝盐、磷酸铁盐、闭蓄态磷和磷酸钙盐含量均低于 2 种乡土树种人工林。另外,桉树林土壤潜在最大磷吸附量低于 2 种乡土树种人工林,而土壤磷吸附饱和度却高于 2 种乡土树种人工林。因此,就土壤磷素供应水平和吸附性能而言,马尾松和红椎比桉树更适于作为当地的造林树种。
关键词:  土壤磷组分,磷吸附特征,桉树人工林,乡土树种人工林,南亚热带
DOI:10.13758/j.cnki.tr.2020.05.020
分类号:S153
基金项目:广西自然科学基金项目(2016GXNSFAA380228)资助。
Comparison of Eucalyptus Plantation and Typical Native Species Plantations in Soil Phosphorus Fractions and Sorption Characteristics in South Subtropical China
ZHENG Wei1, LI Chenxi1, TAN Ling1, MING Angang2, HE Youjun3, QIN Lin4
1.College of Forestry, Guangxi University;2.Experimental Centre of Tropical Forestry, Chinese Academy of Forestry;3.Research Institute of Forestry Policy and Information, Chinese Academy of Forestry;4.Guangxi Key Laboratory of Forest Ecology and Conservation, College of Forestry, Guangxi University
Abstract:
Soil phosphorus is considered the key factor for restricting the productivity of plantations in south subtropical China. However, little information is available about the change in soil phosphorus fractions and sorption characteristics of different species plantations in this area. The content of phosphorus fractions and phosphate adsorption properties in different soil layers (0-20, 20-40 and 40-60 cm) were analyzed under exotic fast-growing eucalyptus plantation and typical native species (Pinus massoniana, Castanopsis hystrix) plantations in the Experimental Center of Tropical Forestry of Chinese Academy of Forestry located in Pingxiang City, Guangxi. The results revealed that organic phosphorus (Po) which accounted for 46.25%-71.58% (91.51-257.45 mg/kg) of total phosphorus (TP), was the main form of TP in the three plantation soils. The contents of soil TP, Po and inorganic phosphorus (Pi) in eucalyptus plantation were obviously lower than those in Pinus massoniana and Castanopsis hystrix plantations. Meanwhile, the content of soil labile organic phosphorus (LO-P) was significantly higher in eucalyptus plantation than in the two native species plantations, while the contents of soil Al-P, Fe-P, O-P and Ca-P were lower than in the two native species plantations. In addition, the potential maximum phosphorus adsorption capacity (Qm) in eucalyptus plantation was lower than that in the two native species plantations, while the degree of phosphate saturation (DPS) was higher than in the two native species plantations. Therefore, in terms of soil phosphorus supply and adsorption property, Pinus massoniana and Castanopsis hystrix could be superior to eucalyptus as the afforestation tree species in this region.
Key words:  Soil phosphorus fraction  Phosphorus sorption characteristics  Eucalyptus plantation  Native species plantation  South subtropics

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