论文部分内容阅读
以茂名小良水保站林地和周边天然恢复林地为研究区域,对区域内9种不同植被类型下45个观测点土壤的物理性状、化学性状、微生物性状和酶活性共32个指标进行取土化验和灰色相关分析及综合评价,结果表明:(1)土壤肥力从高到低的顺序为天然恢复林>阔叶林>松桉混交林>U6.31>W5.31>W5.34>W5.41>W5.44>光板地。(2)用该方法把样地分为5个等级,各等级的土壤属性特征非常明显:1等最好,天然次生林植被茂盛,土壤肥力高;5等最差,保留的光板地,很少有草类生长,土壤肥力极低。(3)样地土壤肥力灰色相关分析综合评价的结果与样地实际植被生长情况看出的土壤肥力状况非常吻合,说明此方法科学可行。综合分析得出:桉树适合作为先锋林,用以恢复赤裸地,但不适合长期种植、连栽等,会导致肥力退化,不利于生态修复;如果必须栽植纯桉林,就要采取经常更换品种、轮种、混交、保护林下植被、保留枯枝落叶覆盖物等措施,对保护土壤肥力大有益处。
Taking the Maoming Xiaolan Hydropower Station and the surrounding natural restoration woodland as the research area, soil physical properties, chemical properties, microbial properties and enzyme activities of 45 soil organic matter in 9 different vegetation types in the region were collected and 32 soil samples were harvested The results showed that: (1) The order of soil fertility from high to low was natural recovery forest> broadleaf forest> mixed forest of Eucalyptus and cinnamomi> U6.31> W5.31> W5.34> W5 .41> W5.44> light board ground. (2) According to this method, the sample plots were divided into five grades, and the soil attributes of each grade were very obvious: 1 was the best, and the natural secondary forest was lush with high soil fertility; 5 was the worst, Grassy growth, soil fertility is very low. (3) The results of gray correlation analysis and comprehensive evaluation of soil fertility of sample plots are in good agreement with the soil fertility conditions observed in the actual growth of plots, which shows that this method is scientifically feasible. Comprehensive analysis shows that: Eucalyptus suitable as a pioneer forest, to restore the naked, but not suitable for long-term planting, planting and so on, will lead to degradation of fertility is not conducive to ecological restoration; if you must planted pure eucalyptus forest, it is necessary to take regular replacement varieties , Rotation, mixed planting, protection of understory vegetation, litter cover retention and other measures to protect soil fertility great benefits.