《Wetlands Ecology and Management》杂志刊登“巴西伯南布哥州红树林茎尖叶和花的形成研究”

作者：Thereza C.C Medeiros,Everardo V.S.B Sampaio

刊物：《Wetlands Ecology and Management》,2013年3月

关键词：生命周期；叶子形成；花形成；生物量；茎尖

摘要：树叶是红树林生产力的主要组成部分，但是有关树叶动力学的数据比较稀缺，我们在河岸带红树林选择了四个站点并对三个物种的茎尖进行了标记，以监测叶子的形成、衰老、脱落和花的形成。植物社会学数据被用来预测红树林的叶面积和生物量。叶片的尺寸和形成过程在四个站点中基本相似。Avicennia schaueriana的叶痕有10个、现有树叶8.1片、叶子形成速率48天以及其生命周期是13.1个月，与Avicennia schaueriana相比，美国红树的茎尖有更多的叶痕（41个），更多的现有树叶（9.7片），更快的叶子形成速率（26天），以及更短的生命期（8.4个月），而假红树除了生命期（6.8个月）较美国红树短之外，其它相应数据（15个，6.6片，31天）都较美国红树要长。茎尖成花的比例方面，假红树的比例最高（13%），美国红树次之（11%），Avicennia schaueriana最低（2%）。美国红树树叶的最大平均生物量最高（每片叶子0.75g），假红树和Avicennia schaueriana分别为0.53 g和0.37 g，美国红树同时拥有最高的物种密度（每公顷2590株），假红树和Avicennia schaueriana分别为每公顷694株和202株，这样的特点使得美国红树有最大的叶生产力（每年每公顷10.6毫克），而假红树和Avicennia schaueriana分别只有2.4毫克和0.3毫克。美国红树林总的叶生产力较高，比迄今为止已报道的世界上其他红树林生产力都高。

Leaf and flower formation in shoot tips of mangrove trees in Pernambuco, Brazil

Authors: Thereza C.C Medeiros,Everardo V.S.B Sampaio

Journal: Wetlands Ecology and Management，March 2013

Key words: Leaf life span; Leaf formation; Flower formation; Biomass; Shoot tip

Abstract: Leaves are major components of mangrove productivity, but data on leaf dynamics are scarce. We marked the shoot tips of three species in four sites of a riverine mangrove and monitored leaf formation, senescence and abscission and flower formation. The leaf area and biomass in the mangrove were estimated using phytosociological data. Leaf size and formation were similar among the four sites. The tips of Rhizophora mangle had more leaf scars (41), more leaves present (9.7), a faster leaf formation rate (one every 26 days) and a shorter life span (8.4 months) than those of Avicennia schaueriana (10, 8.1, 48 days and 13.1 months, respectively) and Laguncularia racemosa, except for the shorter life span (15, 6.6, 31 days and 6.8 months, respectively). The proportion of tips that flowered was higher in L. racemosa (13 %) and in R. mangle (11 %) than in A. schaueriana(2 %). The largest biomass of the average R. mangle leaf (0.75 vs. 0.53 and 0.37 g leaf−1, of L. racemosa and A. schaueriana, respectively) and the highest plant density of this species (2,590 vs. 694 and 202 plant ha−1, respectively) resulted in it having the greatest leaf productivity (10.6 Mg ha−1 year−1 compared to 2.4 Mg ha−1 year−1 for L. racemosa and 0.3 Mg ha−1 year−1 for A. schaueriana). The total leaf production is higher in this mangrove than most of those reported for other mangroves in the world.

原文链接：http://link.springer.com/article/10.1007/s11273-013-9291-9