基于空间分析的桉树人工林土壤肥力评价

Eucalyptus Plantations Soil Fertility Evaluation based on Spatial Analysis

利用广西黄冕林场桉树人工林135个土壤样点数据,分析该区域土壤p H、有机质、碱解氮、速效钾、有效磷等养分含量及其空间分布情况,利用空间分析法,对研究区桉树人工林的土壤肥力进行综合评价。结果表明,黄冕林场桉树人工林的土壤肥力分为"低、中、高"3个等级,其土壤呈酸性,p H值为4.39-4.64,土壤有机质含量为21.97-39.46g/kg,土壤碱解氮含量为97.18-171.84mg/kg,土壤速效钾含量差异性较大,整体含量为26.29-184.98mg/kg,土壤有效磷含量为1.32-3.09mg/kg。根据区域养分等级划分标准,其土壤有机质、碱解氮、速效钾含量的范围均在中等以上水平,而土壤有效磷含量水平为极低。黄冕林场各分场土壤有效铜、有效锌、有效硼较为缺乏,在其施肥推荐方案中可适量添加铜、锌与硼等微量元素。研究结果为桉树人工林土壤改良提供参考。

Soil p H,organic matter,alkali-hydrolyzed nitrogen,available potassium,available phosphorus and their spatial distribution were analyzed based on 135 soil samples data of Huangmian eucalyptus plantation,Guangxi. The soil fertility of eucalyptus plantation was evaluated. The results showed that the soil fertility of research area was divided into three grades： low,medium and high. The soil p H value was 4. 39-4. 64,soil organic matter was 21. 97-39. 46 g/kg,soil alkali-hydrolyzed nitrogen was 97. 18-171. 84 mg/kg. The total content was 26. 29-184. 98 mg/kg,and the available phosphorus content was 1. 32-3. 09 mg/kg. According to the criterion of regional nutrient grade,the range of soil organic matter,alkali-hydrolyzed nitrogen and available potassium was above the medium level,but the content of available phosphorus in soil was very low. The available copper,available zinc and available boron in the soil of research area were scarce. The results provide reference for soil improvement of eucalyptus plantation.