Structure and Dynamics of a Quercus serrata Stand Near Urban Areas (I). Stand structure and the population characteristics of Quercus serrata.

the underlying structure of language proficiency and the proficiency level

هدف از انجام این تخقیق بررسی رابطه احتمالی بین سطح مهارت زبان خارجی (foreign language proficiency) و ساختار مهارت زبان خارجی بود. تعداد 314 زبان آموز مونث و مذکر که عمدتا دانشجویان رشته های زبان انگلیسی در سطوح کارشناسی و کارشناسی ارشد بودند در این تحقیق شرکت کردند. از لحاظ سطح مهارت زبان خارجی شرکت کنندگان بسیار با هم متفاوت بودند، (75 نفر سطح پیشرفته، 113 نفر سطح متوسط، 126 سطح مقدماتی). کلا ...

Composition, structure, and intra-stand spatial patterns along a disturbance severity gradient in a Quercus stand

Gross nitrogen retranslocation within a canopy of Quercus serrata saplings.

Nitrogen (N) retranslocation within tree canopies has been intensively studied and assumed to function as a one-way process (e.g., from older to newer leaves). However, recent studies have found that both N output and input occur in individual leaves, suggesting that 'gross' N retranslocation exists behind 'net' N retranslocation. In the present study, the amount and direction of gross N retran...

Relative shoot height and irradiance and the shoot and leaf properties of Quercus serrata saplings.

Effects of relative shoot height and irradiance on shoot and leaf properties of Quercus serrata Thunb. saplings growing in the understory and in gaps were investigated. Photosynthetic photon flux (PPF) at the location of the shoot relative to that in the open (relative PPF; rPPF) and the height of the shoot base relative to tree height (relative height; rHeight) were measured for all current-ye...

Investigation of throughfall and litterflow chemical characteristics of Quercus castaneifolia in the mixed stand (Case study:Shaskolateh forest)

The aim of this study was to investigate the effect of throughfall (TF) and litterflow (LF) on oak (Quercus castaneifolia C.A.Mey.) and their monthly changes in the mixed stands located in district one of Shastkolate forest, Golestan province. For this purpose, TF and LF samples were collected after each rainfall (RF) in a one-year period and their content of Na+, K+ and Ca2+ compared with the ...