Evaluasi Tegakan Mangrove Hasil Rehabilitasi dengan Teknik Guludan

Guludan technique becomes an alternative for mangrove rehabilitation in the disused fishponds. This technique has been implemented since 2005 on the coast of Jakarta. The wider application of this technique requires several studies in advance to see growth of the mangrove in the already planted guludan. This study aims to measure the growth of mangroves planted by guludan techniques, identify environmental factors that affect their mangrove growth, and analyze their relationship. Measurements were performed on 40 guludan samples which planted by Rhizopora mucronata in 2010 - 2013. Rhizopora mucronata grew well in the guludans, followed by Sonneratia caseolaris that grew naturally. Both were dominated by individuals in sapling phase. Meanwhile, environmental factors affecting mangrove growth were N-total, P, Mg, Ca, Na, clay texture, CEC, soil salinity, soil pH, and water level in the guludan.Keywords: guludan technique, mangrove rehabilitation, Rhizophora mucronata, Sonneratia caseolaris

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Species Responses to Grazing and Environmental-Factors in an Arid Halophytic Shrubland Community

Australian Journal of Botany ◽

10.1071/bt9870135 ◽

1987 ◽

Vol 35 (2) ◽

pp. 135 ◽

Cited By ~ 13

Author(s):

RB Hacker

Keyword(s):

Environmental Factors ◽

Soil Salinity ◽

Large Scale ◽

Chemical Properties ◽

Grazing Pressure ◽

Aerial Photographs ◽

Small Scale ◽

Factors Affecting ◽

Species Responses

Species responses to grazing and environmental factors were studied in an arid halophytic shrubland community in Western Australia. The grazing responses of major shrub species were defined by using reciprocal averaging ordination of botanical data, interpreted in conjunction with a similar ordination of soil chemical properties and measures of soil erosion derived from large-scale aerial photographs. An apparent small-scale interaction between grazing and soil salinity was also defined. Long-term grazing pressure is apparently reduced on localised areas of high salinity. Environmental factors affecting species distribution are complex and appear to include soil salinity, soil cationic balance, geomorphological variation and the influence of cryptogamic crusts on seedling establishment.

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Physiological Performance of a Coastal Marsh Plant Hydrocotyle vulgaris in Natural Conditions in Relation to Mineral Nutrition and Mycorrhizal Symbiosis

Proceedings of the Latvian Academy of Sciences Section B Natural Exact and Applied Sciences ◽

10.2478/prolas-2020-0040 ◽

2020 ◽

Vol 74 (4) ◽

pp. 252-262

Author(s):

Ieva Druva-Lūsīte ◽

Andis Karlsons ◽

Una Andersone-Ozola ◽

Baiba Ieviņa ◽

Jevgeņija Nečajeva ◽

...

Keyword(s):

Environmental Factors ◽

Soil Salinity ◽

Mineral Nutrients ◽

Plant Distribution ◽

Mycorrhizal Symbiosis ◽

Natural Conditions ◽

Factors Affecting ◽

Active Radiation ◽

Physiological Performance ◽

Wide Range

AbstractFluctuating soil salinity and competition for light are the main factors affecting plant distribution and performance in coastal salt marshes. The aim of the present study was to assess plant performance by means of non-destructive instrumental methods in a highly heterogeneous natural habitat. More specifically, environmental factors affecting growth and physiological performance of a clonal plant Hydrocotyle vulgaris L. were investigated. Changes in soil salinity, soil mineral characteristics, leaf nutrient concentrations, morphological parameters, chlorophyll fluorescence, and mycorrhizal symbiosis were analysed in different experimental plots of naturally growing H. vulgaris plants. The dynamic nature of interaction between sea water flooding-affected changes in soil salinity and competition-dependent changes in light availability led to micro-environmental heterogeneity differentially affecting physiological performance and growth of H. vulgaris in natural conditions. Plant growth was mostly affected by intensity of photosynthetically active radiation in the respective plots. Increased growth rate in shaded conditions specifically pointed to shade tolerance strategy of H. vulgaris. High heterogeneity of mineral nutrients between the plots was established. However, considerable plasticity of metabolism in respect to highly variable soil concentration of mineral nutrients together with effective mineral adaptation mechanisms ensured optimal supply of material for growth. Photochemistry of photosynthesis was only marginally affected by differences in microenvironmental conditions as shown by respective changes in chlorophyll a fluorescence parameters. Mycorrhizal symbiosis was stimulated by moderately increasing soil salinity and suppressed by relatively high salinity. When the effect of soil salinity was omitted, intensity of mycorrhizal symbiosis was positively associated with intensity of photo-synthetically active radiation. In general, a relatively high stable level of photosynthetic performance across a wide range of micro-environmental conditions indicates an adequate level of physiological adaptation of H. vulgaris to conditions of a coastal salt marsh. The present data clearly reflect complex interactions between environmental factors and plastic physiological responses of H. vulgaris.

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Effects of environmental factors on weed species composition of cereal and stubble fields in western Hungary

Open Life Sciences ◽

10.2478/s11535-009-0079-0 ◽

2010 ◽

Vol 5 (2) ◽

pp. 283-292 ◽

Cited By ~ 10

Author(s):

Gyula Pinke ◽

Robert Pál ◽

Zoltán Botta-Dukát

Keyword(s):

Environmental Factors ◽

Species Composition ◽

Soil Ph ◽

Vegetation Period ◽

Mean Annual Precipitation ◽

Mean Annual Temperature ◽

Weed Species ◽

Factors Affecting ◽

Weed Communities ◽

Winter Annuals

AbstractMultivariate analysis of data obtained from 184 cereal and stubble fields in low-input agricultural systems located in western Hungary was undertaken in order to asses environmental factors affecting weed species composition. For each variable, the gross and net effect on weed species composition was calculated. All variables considered in this study had a significant effect on weed species composition and explained 26.99% of the total variation. Most variation in species composition was explained by the aspect (cereal vs. stubble), followed by soil pH, mean annual precipitation, soil texture, mean annual temperature, and altitude. Separating the cereals and stubbles soil pH became the most important factor. Our results suggest that during the long vegetation period, cereal weed communities dominated by winter annuals are replaced by stubble-field weed communities dominated by summer annuals. This seasonal change may also have the same important effect on weed species composition as crop types.

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