| 摘要: |
| 利用2002年广东省森林资源与生态状况综合监测评估体系的95个桉树林样地的调查资料研究了桉树林的土壤肥力。用环刀法测定其土壤容重、毛管孔隙度、非毛管孔隙度、毛管持水量等物理性质；用土壤化学分析方法测定其土壤有机质、全N、全P、全K、速效N、速效P、速效K含量. 按《我国土壤质地暂行分类方案》将95个样地土壤合并为粉壤土、粘壤土、粗砂土、细砂土、面砂土、粉粘土、砂粘土、粘土、壤粘土. 通过对土壤理化性质进行聚类分析，将土壤按质地类型划分为4类：第1类包括粉壤土、粉粘土和壤粘土，速效K含量较高，速效P含量中等，其余养分含量位居9种土壤的前列，容重和毛管孔隙中等，肥力较高；第2类是粘壤土，全K含量最高，速效N含量中等，其余养分含量较低，容重较小，毛管孔隙较大而非毛管孔隙中等，总体上肥力水平中等；第3类包括粗砂土、细砂土、面砂土和砂粘土，此类土大多数有机质、全N、全K、速效N、速效K含量低，而有的速效P含量较高，容重大、毛管孔隙小，总体来说肥力低； 第4类为肥力高的粘土，其有机质、全N、全P、速效N、速效P含量均是9种土壤中最高的. |
| 关键词: 广东 桉树人工林 土壤肥力 |
| DOI： |
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| Soil Fertility of Eucalypt Plantations in Guangdong Province |
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Li Ai-Ying
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| Abstract: |
| Mechanical sampling was used to set 95 plots in eucalypt plantations in Guangdong Province. Ring knife method was used to study soil physical properties, such as soil bulk density, soil capillary porosity, non-capillary porosity, soil maximum water. Soil chemical analysis method was used to determine the contents of soil organic matter, total N, total P, total K, alkalized N , available P and available K. According to the parent rocks developing soils, 95 soils were combined into the soils developed from granite, limestone, purple sandstone, sandshale and basalt. Meanwhile, they were divided into silty loam, glueing loam, course-sand soil, fine-sand soil, face sandy soil, silty clay, sandy clay, clay and loam clay according to “Classification of Soil Texture in China”. Using cluster analysis, soil fertilities were divided into four types: the first group included silty loam, silty clay and loam clay, which had relative high available K, median available P, and other nutrients ranked forefront, soil density and capillary porosity were median, so that their fertility was high; the second group included glueing loam, which had the highest available K, median alkalized N, whereas other nutrients were relative low, soil density was small, capillary porosity was great and non-capillary porosity was median, so that their fertility was median; the third group included course-sand soil, fine-sand soil, face sandy soil and sandy clay, most of which had low soil organic matter, total N, total K, alkalized N and available K, and available P contents of some plots were high, soil density was great with small capillary porosity, resulting their low soil fertility; the fourth group included clay with high fertility, its soil organic matter, total N, total P, alkalized N and available P contents were the highest among the nine type soils |
| Key words: Guangdong eucalypt plantation soil fertility |
