Eurasian Journal of Forest Science

1-11

Authors: Melih Öztürk1*, Ercan Gökyer2

Based on the sunlight duration, percentage of light transmission and canopy gaps vary within the phenological stages involving budburst, flushing, leaf development, senescence, fading and leaf fall. In this study, the seasonal pattern of light transmission and canopy gaps of deciduous vegetation along a rural road section was monitored. The rural road is surrounded by forest landscape and, connects Bartın and Safranbolu cities. The road is located within the Bartın watershed of Turkey. Hemispherical photographing and image processing techniques were used to analyze the percentage of light transmission and canopy gaps throughout a foliage year in between 2012 and 2013. During 22 field visits, 220 hemispherical photographs were taken from 10 points along 700 m of the experimental site. Percentage of light transmission, and canopy gaps data were evaluated together with the daily sunlight duration data from the meteorological station. The correlation (r) between mean sunlight duration (msd) and the percentage of mean light transmission (mplt) were -0.68. On the other hand, the correlation (r) between mean sunlight duration (msd) and the percentage of mean canopy gaps (mpcg) were -0.75. Both of the correlations were highly significant (P < 0.01). The seasonal patterns of mplt, mpcg, and msd were assessed considering both the roadside vegetation and the surrounding landscape, emphasizing travelers’ and drivers’ perceptions.

19-27

Authors: M. Cüneyt Bağdatlı1*, KorkmazBellitürk2, Anahita Jabbari3

This study is performed in Nevşehir province at central Anatolian parts of Turkey. The aim of the current study was to investigate the yearly changes of rainfall and temperature climatic parameters in the long data period from 1975 up to 2014 years. The total of 40 years precipitation and temperature monthly data were first separated and classified seasonally and then were assessed by Mann-Kendall and Spearman Rho tests. The long term average of monthly rainfall data was recorded about 421 mm and the average temperature amount was calculated 20.9 °C for summer months. The maximum and minimum temperature values in summer months were recorded 33.5 °C and 7.7 °C respectively. The study was performed on long term rainfall and temperature data sets in order to investigate the transformations effects on soil and water resources, and that was obvious the rainfall data did not follow an increasing slope within different years, but a serious additive trend was observed in the average, maximum and minimum long term temperature amounts. Moreover along with the increasing temperature rate at the region, the growing surface water vaporing was recorded. The gradual reduction of rainfall amounts causes some difficulties in solution and absorption of fertilizer nutrient elements by plants and in addition leads to unsufficient amounts of soil moisture in dry farming lands.

1-13

Authors: İlyas BOLAT1*, Ömer KARA2 , Metin TUNAY3

A significant parameter that links plants to soil is microbial biomass. Therefore, measurement of the biologically-active fractions of the soil organic matter, such as microbial biomass C, N and P, is a good way to quantify the quality of the soil. In this study, the seasonal dynamics of microbial biomass C, N and P and associated microbial properties were investigated in the forest’s floor (litter, fermentation and humus) and topsoil (0 – 5 cm) under a stand of Bornmullerian fir (Abies nordmanniana subsp. bornmülleriana Mattf.). According to One-Way ANOVA, the study showed that seasonal changes have a significant effect on the quantities of microbial biomass C, N and P and associated microbial properties in the forest’s floor and soil. For example, the greatest amounts of microbial biomass C, N and P in the forest’s floor and topsoil occurred during summer. Also, seasonal variations have significant effects on microbial biomass C, N and P in the forest’s floor and soil because they alter the climate and chemical characteristics of the soil. Annual releases of C, N and P through microbial biomass were higher in the forest’s floor than in soil. The results of this study indicated that variations in the microbial biomass and basal respiration during the different seasons are related to changes microbial activity.

22-28

Authors: Wang Xiao HONG 1*

Phyllostachys heteroclada olive (P. Het) and Neosinocalamus affinis King (N. Aff) flowered from 2003 to 2007 in Ya’an district in China. We determined metabolism indices of these two bamboo species, and analyzed the key flowering metabolism factors by PCA (principal component analysis). The result showed that GA (Gibberellin), GA/ABA (Gibberellin/Abscisic Acid) were the most important factors of bamboo flowering, followed by starch, amylase activity and soluble sugar, all of which were positively correlated with bamboo flowering. ZT (Zeatin) was negatively correlated to bamboo flowering, it obstructed bamboo flowering and contributed to bamboo flower reversion. Based on the above and former research, we built a bamboo flowering model which showed that bamboo flowering is a long and complicated process. External factors, especially harsh environments such as droughts and high temperatures and internal mechanisms such as GA, GA/ABA, starch, amylase and soluble sugar would possibly accelerate or terminate growth and florescence, making bamboo florescence highly variable.