relationship between soil seed bank and above-ground vegetation of a mixed-deciduous temperate forest in northern iran
نویسندگان
چکیده
we assessed the size and composition of the soil seed bank and above-ground vegetation in 52 relevés representing a range of habitats within an old- growth, temperate deciduous forest at hyrcanian region, northern iran. we identified 63 taxa in the seed bank, with an average density of 4202 seeds/spores per m2 by seedling emergence method. hypericum androsaemum, cardamine impatiens, and rubus hyrcanus, with athyrium flix- femina and pteris cretica as two ferns, were the most abundant species in the seed bank and spore bank that made up to 92 % of the seeds/spores recorded in the soil seed bank. totally, 107 species were recorded in the vegetation and soil seed bank of the study site, of which 33 % were common in both seed bank and vegetation and 26 % and 41 % were found only in the seed bank or in the vegetation, respectively. the dominant tree species with many woody understory species found in the above- ground vegetation were absent from the persistent soil seed bank. jaccard’s similarity coefficient revealed that the correspondence between the species in the vegetation and the same species in the seed bank were consistently low (average of 24.3%) based on presence/absence data. yates- corrected c 2 test showed that sites present significant differences (p
منابع مشابه
The seed bank in an old-growth, temperate deciduous forest
We assessed the size and composition of the seed bank in 31 plots representing a range of habitats within an old-growth, temperate deciduous forest at Mont St. Hilaire, Québec, Canada. We identified 49 taxa in the seed bank, with an average of 40 species·m–2 and a median density of 1218 seeds·m–2. The most frequent seeds were species of Carex and Rubus, Diervilla lonicera, and Eupatorium rugosu...
متن کاملSoil seed bank dynamics in relation to topographic position of a mixed-deciduous forest in southern New England, USA
We examined the ̄oristic signi®cance of soil seed banks in relation to valley, midslope and ridge sites in a 70±90-year old forest in northeastern Connecticut. A-horizon mineral soils were collected to 5 cm depth in the early spring from forest understory sites across the topography. Samples from each of the sites were exposed to full sun within a greenhouse. Records of germination were made at...
متن کاملBiogenic Hydrocarbon Chemistry within and Above a Mixed Deciduous Forest
This manuscript includes findings from field and numerical modeling investigations designed to quantify the degree and rates of biogenic hydrocarbon chemical processing within and above a mixed deciduous forest in the southeastern United States. The study site was under the influences of nitrogen oxide and hydrocarbon emissions from suburban automobile traffic. The most common ambient biogenic ...
متن کاملTurbulent Transport above a Mixed Northern Forest
The eddy-covariance (EC) method is often used to measure the exchange of chemical compounds such as CO2. Transport is calculated using the covariance of two high frequency measurements. There are problems with the EC method, particularly under light wind conditions. Surface-layer EC measurements represent relatively small flux footprints (~1Km). It is difficult to assess the representativeness ...
متن کاملa comparative study of the relationship between self-, peer-, and teacher-assessments in productive skills
تمایل به ارزیابی جایگزین و تعویض آن با آزمون سنتی مداد و کاغذ در سالهای اخیر افزایش یافته است. اکثر زبان آموزان در کلاس های زبان از نمره نهایی که استاد تعیین میکند ناراضی اند. این تحقیق جهت بررسی ارزیابی در کلاس های زبان انگلیسی به هدف رضایتمندی زبان آموزان از نمره هایشان انجام گرفته است که در آن نمرات ارائه شده توسط سه گروه ارزیاب (ارزیابی خود دانشجو، همسالان واستاد) در مهارت های تولید (تکل...
15 صفحه اولEstimating soil seed bank characteristics in Ponderosa Pine Forests using vegetation and forest-floor data
Soil seed banks are important for vegetation management because they contain propagules of species that may be considered desirable or undesirable for site colonization after management and disturbance events. Knowledge of seed bank size and composition before planning management activities facilitates proactive management by providing early alerts of exotic species presence and of abilities of...
متن کاملمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
journal of agricultural science and technologyناشر: tarbiat modares university
ISSN 1680-7073
دوره 13
شماره Number 3 2011
کلمات کلیدی
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023