Factors influencing Rhizophora mangle L. seedling development in Everglades carbonate soils
Factors influencing Rhizophora mangle L. seedling development in Everglades carbonate soils
复制标题
DOI：
10.1016/s0304-3770(97)00027-2
复制
发表时间：
1997-11-01
期刊：
影响因子：
1.8
通讯作者：
Snedaker, SC
中科院分区：
文献类型：
--
作者：
Koch, MS;Snedaker, SC
养分限制、土壤涝害和土壤盐分被认为是限制新热带红树林发展的主要因素。发起了一项中生态实验，使用来自佛罗里达大沼泽地南部的低营养土壤来研究这些替代因素。测定了氮（N）、磷（P）、通气和盐度处理对红树幼苗叶面积、茎伸长和生物量发育的影响。在中生态实验中，磷而不是氮是限制R. mangle叶面积以及根和叶生物量发育的重要宏观养分。随后在现场进行了磷富集实验，以证实中生态系统的发现。在田间富磷条件下，与未施肥对照相比，幼苗茎伸长率从0.03 mm d(-1)增加到0.20 mm d(-1)，叶面积从25 cm(2)增加到75 cm(2)。在中生态实验中，土壤通气刺激了根系生物量的发展 40%。千分之 32 的氯化钠导致分枝萌发，但没有叶子反应；然而，超过千分之四十五的高盐度条件会导致顶芽变性。因此，在没有高盐度胁迫的情况下，磷被确定为限制低营养碳酸盐土壤中的R. mangle叶和茎发育的主导因素。土壤缺氧也会影响根系发育，并可能调节茎对田间施磷肥的伸长反应。 (C) 1997 Elsevier Science B.V.
Nutrient limitation, soil waterlogging, and soil salinity have been hypothesized as the principal factors limiting the development of neotropical mangrove forests. A mesocosm experiment was initiated to investigate these alternative factors, using low-nutrient soils from the south Florida Everglades. Nitrogen (N), phosphorus (P), aeration, and salinity treatment effects on Rhizophora mangle L. seedling leaf area, stem elongation, and biomass development were determined. Phosphorus rather than nitrogen was the important macro-nutrient limiting R. mangle leaf area, and root and leaf biomass development in the mesocosm experiment. A subsequent P enrichment experiment was conducted in the field to substantiate mesocosm findings. Under P enrichment in the field, seedling stem elongation rates increased from 0.03 mm d(-1) to 0.20 mm d(-1) and leaf area increased from 25 cm(2) to 75 cm(2), relative to unfertilized controls. Soil aeration stimulated root biomass development 40% in the mesocosm experiment. Sodium chloride at 32 parts per thousand resulted in branch initiation with no leaf response; however, hypersaline conditions greater than 45 parts per thousand caused denaturing of terminal buds. Thus, without hypersalinity stress, P is identified as a dominant factor limiting R. mangle foliar and stem development in low nutrient carbonate soils. Soil anoxia also influences root development and may moderate stem elongation responses to P fertilization in the field. (C) 1997 Elsevier Science B.V.