广州南沙典型林地土壤理化性质的研究

研究了南沙的尾叶桉林、窿缘桉林、大叶相思林、荔枝林、木麻黄林、尾叶桉×马占相思混交林、尾叶桉×台湾相思×马尾松混交林、赤桉×台湾相思混交林和无林地的土壤理化性质。大叶相思林地肥力最高,荔枝林的肥力较低,木麻黄林地和无林地的肥力低,其余林地的肥力中等。

Soil Physical and Chemical Properties of Model Woodlands in Nansha, Guangzhou

Soil physical and chemical properties are studied in Eucalypyus urophylla,Eucalypyus exserta,Acacia auriculaeformi,Litchi chinensi,Casuarina equisetifolia woodlands,Eucalypyus urophylla×Acacia mangium,Eucalypyus urophylla×Acacia confusa× Pinus massoniana,Eucalypyus camaldulensis×Acacia confusa mixed woodlands and non-woodland,Nansha.Eucalypyus stands shows a median soil density,a good water preserving ability and a median aeration ability,whereas Eucalypyus×Acacia mixed woodlands shows a small soil density,good water preserving ability and aeration ability.The soil of Acacia auriculaeformi plantation is porous,its water preserving ability is median,whereas its aeration ability is good.Litchi chinensi woodlands show a median soil density,good water preserving ability and a bad aeration ability;the soils of Casuarina equisetifolia plantation and no-woodland are solid and arid,their water preserving ability and aeration ability are bad.All soils for these woodlands show a strong acidity.The contents of soil organic matter,total N,alkalized N and available K are high in Acacia auriculaeformi,Eucalypyus,Eucalypyus×Acacia woodlands,where they are low in Litchi chinensi,Casuarina equisetifolia woodlands and no-woodland.Total P and total K are rich in no-woodland,Acacia auriculaeformi and Casuarina equisetifolia woodlands,whereas available P is rich in Eucalypyus and Litchi chinensi woodlands and no-woodland.There are very significant negative correlations between soil density and non-capillary porosity,total porosity as well as total N,and significant negative correlations between soil density and capillary moisture capacity,organic matter as well as alkalized N.There are very significant positive correlations between capillary porosity and capillary moisture capacity,between non-capillary porosity and total porosity.Total porosity had significant positive correlations with capillary moisture capacity and alkalized N,very significant positive correlations with organic matter as well as total N.Generally,the soil fertility of Acacia auriculaeformi plantation is the highest among all woodlands,Litchi chinensi woodlands have relative low soil fertility,and those of Casuarina equisetifolia woodland and no-woodland were low,whereas the soil fertilities of other woodlands are median.