福建九龙江口不同林龄拉关木人工林凋落物组成及季节动态

发布时间：2018-12-29 07:41

【摘要】：收集福建九龙江口人工红树林拉关木(Laguncularia racemosa)中的4、6、8年生3种不同林龄植被全年的凋落物,测定其数量、组成及季节动态.结果表明,4、6、8年生拉关木林年凋落量分别为10 930.1、12 085.3、13 723.4 kg/hm2.各林龄拉关木林的凋落物组成均以落叶为主,4、6、8年生拉关木林的凋落叶量分别占年总凋落量的86.16%、77.47%、81.30%,落枝、落花、落果在年凋落物中所占的比例较小.各林龄拉关木林年凋落物量均显示出明显的季节动态,其季节变化曲线均呈双峰型,4年生和6年生的拉关木林均在5月和9月出现峰值,而8年生的拉关木林则在4月和9月出现峰值;各年龄段的拉关木林的落叶和总凋落量变化模式相同,而落枝、落花、落果的变化模式不尽相同.研究结果可为河口湿地生态系统拉关木人工林的经营管理提供参考.
[Abstract]:The litter of (Laguncularia racemosa) of mangroves in Jiulong River Estuary, Fujian Province was collected. Three kinds of vegetation of different forest ages were collected, and their number, composition and seasonal dynamics were determined. The results showed that the annual litter amount of Laguanwood forest was 10 930.1m 12 085.3N 13 723.4 kg/hm2., respectively. The litter composition of Laguan wood forest at different forest ages was mainly deciduous, and the litter leaf amount of 4m and 8-year-old Laguan wood forest accounted for 86.16% of the total annual litter amount, 77.47% and 81.30%, branches and flowers, respectively. The percentage of falling fruit in the annual litter was small. The annual litter amount of Laguan wood forest showed obvious seasonal dynamics, and its seasonal variation curve was bimodal, and the peak value of 4-year-old and 6-year-old Laguan wood forest appeared in May and September. The 8-year-old Laguan wood forest showed its peak in April and September. The variation patterns of deciduous leaves and total litter amount were the same in different age groups, but the change patterns of branches, flowers and fruits were different. The results can be used as a reference for the management of LaGuanmu plantation in estuarine wetland ecosystem.
【作者单位】：厦门大学环境与生态学院;厦门大学嘉庚学院河口生态安全与环境健康福建省高校重点实验室;
【基金】：国家自然科学基金资助项目(41376115) 福建省中青年教师教育科研资助项目(JA15618) 国家级大学生创新创业训练计划资助项目(201613469011)
【分类号】：S714

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