论文部分内容阅读
以福建省永安市天宝岩自然保护区不同人为经营方式的毛竹林为研究对象,对毛竹林Ⅰ(挖笋+劈草)、Ⅱ(挖笋+劈草+专用肥)和Ⅲ(挖笋+劈草+专用肥+灌水)的养分元素分布格局进行了研究。结果表明,施肥、施肥+灌水等经营方式增加了植被层的养分累积量质量分数,降低了土壤层养分累积量质量分数,平衡乔木层和土壤层碳氮贮量是森林实现科学经营的关键。施肥+灌水虽然明显增加了毛竹林系统养分元素的累积绝对量,但是增加最多的是K元素,而N、P元素累计量呈降低趋势,氮、磷元素是植物生长发育的必需元素,是系统生产力构成的重要因素,氮、磷元素的减少可能损害竹林持续立地生产能力。3种林分主要养分元素在不同层次的排列顺序均为土壤层>乔木层>凋落物层>灌木层>草本层,土壤层养分累积量占养分总累积量99%以上,植被层中乔木层累积量最高,其在植被层中的质量分数高于85%。
Taking the bamboo plantations of Phyllostachys pubescens as the man-made management mode of Tianbaoyan Nature Reserve in Yong’an City of Fujian Province as the research object, the effects of Ⅰ (digging shoots + splitting grass), Ⅱ (digging shoots + splitting grass + special fertilizers) and Ⅲ Split grass + special fertilizer + irrigation) nutrient element distribution patterns were studied. The results showed that management methods such as fertilization, fertilization and irrigation increased the mass fraction of nutrient accumulation in the vegetation layer and decreased the mass fraction of nutrient accumulation in the soil layer. It was the key to realize the scientific management of the forest by balancing carbon and nitrogen storage in the arbors and soil layers. Although fertilization and irrigation significantly increased the absolute amount of nutrient elements accumulated in Phyllostachys heterocycla cv. Pubescens plant, the K element was the most increased, while the N and P element cumulants tended to decrease. Nitrogen and phosphorus were the essential elements of plant growth and development. Productivity constitutes an important factor in the reduction of nitrogen and phosphorus elements may impair the sustainable production capacity of bamboo forests. The order of nutrient elements in the three stands was soil layer> tree layer> litter layer> shrub layer> herb layer, soil nutrient accumulation accounted for more than 99% of total nutrients, vegetation layer tree layer The highest cumulative amount, its mass fraction in the vegetation layer is higher than 85%.