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Paper Information

Journal:   PLANT ECOPHYSIOLOGY (ARSANJAN BRANCH)   fall 2017 , Volume 9 , Number 30 ; Page(s) 165 To 180.

Estimation of weed seed bank storage of Bandar-Gaz Citrus orchards and prepare distribution maps using Geographic Information System (GIS)

Author(s):  SIAHMARGUEE A., Kazemi H., Emdadi Z.
In order to estimate the density of weed seeds in soil seed bank of citrus orchards of Bandar-Gaz township and providing the distribution map of them, 95 orchards were selected and their soil seed bank were determined at two depths (0-10 cm and 10-20 cm) in 2014. Geographic coordinates of each orchard were determined using GPS. These data were used for mapping of different weed species using ArcGIS 10 software. On average, 2555. 31 and 1346. 65 seeds per kg of soil were found at 0-10 cm and 10-20cm depths, respectively. Seeds of 25 weed species belonging to 17 families were observed in Citrus orchards. Poaceae family with 5 species, Solanaceae, Polygonaceae and Euphorbiaceae families, each one with 2 species were important families that contributed in the seed bank of citrus orchards. Amaranthus spp., Solanum nigrum, Physalis alkekengi, Stellaria media and Portulaca oleraceawere important species observed in the soil seed bank of citrus orchards. Seed density of Amaranthus spp., Solanum nigrum, Physalis alkekengi, Stellaria media and Portulaca oleracea were 20 to16310, 0 to 670, 0 to 650, 0 to 5280 and 0 to 18470 seeds per kg of soil, respectively. Survey the maps of the distribution of these species showed that the above species have expanded in the orchards of the city from East to West. Seed densities of the broadleaf and annual species were higher than the grasses and perennial species. Frequency of the broadleaf and the annual species were priority on the grasses and perennial species. Shanon index at depths of 0-10 and 10-20 cm were 0-0. 8 and 0-0. 74 respectively. Results indicated that species diversity was low in citrus orchards. Based on these results, citrus orchards in Bandar-e-Gaz township were infested only a few weed species.
Keyword(s): Frequency,orchard,shanon index,spatial distribution,soil profile,species diversity
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