广西桉树人工林土壤养分现状及其变异性、相关性分析

Current Situation of Soil Nutrient and Analysis of its Variability and Correlation in Eucalyptus Plantations of Guangxi province

选取广西区6个国有林场桉树人工林的200个土壤样品进行土壤养分测定,分析其养分变异特征和相关性,通过养分分级评定和背景值对比分析桉树人工林土壤养分现状以及桉树种植对土壤养分影响程度。试验结果表明,桉树人工林速效磷变异系数最大,其次为交换性钙,两个指标皆达到强变异性,pH值变异性最小,为弱变异性,其他指标皆为中等变异性。pH值与交换性钙、全氮和全钾、水解氮和速效钾、交换性钙和交换性镁的相关性存在显著水平的正相关。桉树人工林土壤养分现状与其背景值趋势相符,表现出缺磷、缺钾现象。其中速效磷、全钾和速效钾三个指标对比背景值含量偏低。

Selected 200 soil samples in Eucalyptus plantations of 6 state-owned forest farms of Guangxi province, conducted a determination of the soil nutrients, and analyzed its variability and correlation. By the evaluation of nutrient level and the comparison with background values, the status of the soil nutrients and the effect of planting Eucalyptus were studied. The results were as follows： the CV （coefficient of variability） of available P was the highest, and followed by exchangeable calcium. Those two indicators had comparatively high variability. The CV of pH Value was the least and had lower variability. Other indicators had medium-degree variability, pH Value and exchangeable calcium, total N and total K, hydrolysable N and available K, exchangeable Ca and exchangeable Mg that showed ;ignificandy positive correlation. The current situation of soil nutrient in Eucalyptus plantation was consistent with its background values, and showed the deficiency of phosphorus and potassium. Available P, total K and available K were lower compared to the background values.