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不同林地类型土壤团聚体稳定性与铁铝氧化物的关系
赵友朋1, 孟苗婧1, 张金池1, 马洁怡1, 刘胜龙1,2
1.南方现代林业协同创新中心 江苏省水土保持与生态修复重点实验室 南京林业大学 林学院, 江苏 南京 210037;2.浙江省凤阳山-百山祖国家级自然保护区凤阳山管理处, 浙江 龙泉 323700
摘要:
[目的]探究浙江省凤阳山保护区内土壤铁铝氧化物对土壤团聚体稳定性的影响机理,为该区恢复与保护土壤资源提供理论依据。[方法]以浙江省凤阳山保护区内黄棕壤地带4种林分类型(阔叶混交林、针阔混交林、杉木林、竹林)为对象,测定不同土层(0—10 cm,10—20 cm,20—30 cm)水稳定性团聚体粒径分布以及不同形态的铁铝氧化物含量,分析各形态铁铝氧化物含量对土壤团聚体稳定性的影响。[结果]①4种林分类型土壤团聚体水稳性大团聚体(>0.25 mm)含量均在90%以上,水稳定性大团聚体含量和平均质量直径(MWD)均表现为:杉木林 > 针阔混交林 > 阔叶混交林 > 竹林。②不同形态铁铝氧化物含量大小整体上表现为:游离态氧化铁Fed >> 游离态氧化铝Ald > 无定形氧化铁Feo > 无定形氧化铝Alo > 络合态氧化铁Fep > 络合态氧化铝Alp,各形态的氧化铁含量随土层加深均增加。③增强回归树BRT分析结果显示,对土壤团聚体MWD影响最大的是Alp,贡献率为43.6%;其次是Ald(23.5%)和Fed(19.5%);Feo(6.9%),Alo(4%)及Fep(2.4%)的影响程度较小。[结论]Alp,Ald和Fed能促进土壤团聚体稳定,络合态氧化铝Alp对土壤团聚体稳定性的促进作用大于游离态铁铝氧化物Ald和Fed
关键词:  林地类型  铁铝氧化物  团聚体稳定性  水稳性大团聚体  平均质量直径
DOI:10.13961/j.cnki.stbctb.2018.04.012
分类号:
基金项目:林业公益性行业科研专项(201504406);江苏省高校优势学科建设工程资助项目(PAPD)
Relationship Between Soil Aggregate Stability and Different Forms of Fe and Al Oxides in Different Forest Types
ZHAO Youpeng1, MENG Miaojing1, ZHANG Jinchi1, MA Jieyi1, LIU Shenglong1,2
1.Jiangsu Province Key Laboratory of Soil and Water Conservation and Ecological Restoration, Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing, Jiangsu 210037, China;2.The Fengyangshan Management Office of Fengyang Mountain-Baishanzu National Nature Reserve in Zhejiang Province, Longquan, Zhejiang 323700, China
Abstract:
[Objective] In order to provide a theoretical basis for the restoration and protection of soil resources, we explore the composition and stability of different forest soil aggregrates in Fengyang Mountain Nature Reserve.[Methods] This study determinated soil aggregates particle size distribution and the content of different forms of Fe and Al oxides in different soil layers(0-10 cm, 10-20 cm, 20-30 cm), and analyzed the effects of various forms of Fe and Al oxides on the stability of soil aggregates in four main forest types(broad-leaved mixed forest, coniferous and broad-leaved mixed forest, Chinese fir forest, bamboo forest)during 1 300~1 400 m of Fengyang Mountain Nature Reserve, Zhejiang Province.[Results] ① The content of soil water-stable macroaggregates(WSA)(>0.25 mm) in four forest types were above 90%, and the order of the content of water-stable aggregates and mean weight diameter(MWD) of soil aggregate were fir forest > coniferous and broad-leaved mixed forest > broad-leaved mixed forest > bamboo forest. ② The order of Fe and Al oxides contents in different forms is Free Fe(Fed) > Free Al(Ald) > Amorphous Fe(Feo) > Amorphous Al(Alo) > Complexing Fe(Fep) > Complexing Al(Alp) ③ The result of boosted regression tree(BRT) analysis showed that soil aggregate MWD was mainly influenced by Alp in various forms of Fe and Al oxides, which produced a 43.6% contribution rate, followed by Ald(23.5%) and the Fed(19.5%); Feo(6.9%), Alo(4%) and Fep(2.4%) had less effect.[Conclusion] Alp, Ald and Fed can promote the stability of soil aggregates. The effect of complexed alumina Alp on the stability of soil aggregates is greater than that of free Fe and Al oxides Ald and Fed.
Key words:  forest types  Fe and Al oxides  aggregate stability  soil water-stable macro-aggregate  mean weight diameter