نتایج جستجو برای: soil factors

تعداد نتایج: 1242692  

Journal: :نشریه علمی - پژوهشی هیدرولوژی کاربردی 0
amin zoratipour ramin university hossein azadi gent university jan nyseen gent university

generally, the evaluation and assessment critical condition of rill formation are useful for a better understanding of soil erosion processes. the inherence characteristics of soils, which have much dynamic variations on the hill-slopes and are affected by rill formation, are the soil critical shear stress and soil erodibility factors. this study aims to assess experimental rill incision thresh...

Journal: :international journal of environmental research 0
b. basso dept. crop systems, forestry and environmental sciences, via ateneo lucano, 10 university of basilicata, potenza, italy. l. de simone food and agriculture organization of the united nations (fao), rome, italy d. cammarano institute of sustainable resources, queensland university of technology, brisbane, australia e.c. martin department of agricultural and biosystems engineering. arizona university, maricopa agricultural center, w. smith-enke road, 37860, maricopa, arizona s. margiotta dip. tecnico-economico, gestione territorio, via ateneo lucano, 10 university of basilicata, potenza, italy p.r. grace institute of sustainable resources, queensland university of technology, brisbane, australia m.l. yeh

the main factors affecting environmental sensitivity to degradation are soil, vegetation, climate and management, through either their intrinsic characteristics or by their interaction on the landscape. different levels of degradation risks may be observed in response to particular combinations of the aforementioned factors. for instance, the combination of inappropriate management practices an...

2017
Fang Yu Boris Faybishenko Allen Hunt Behzad Ghanbarian

Soil depth tends to vary from a few centimeters to several meters, depending on many natural and environmental factors. We hypothesize that the cumulative effect of these factors on soil depth, which is chiefly dependent on the process of biogeochemical weathering, is particularly affected by soil porewater (i.e., solute) transport and infiltration from the land surface. Taking into account evi...

2014

The effect of crop species and edaphic factors on the distribution of Trichoderma species in Alfisol soil under different agrosystems was evaluated. Each soil sample was assayed for nine abiotic factors and culturable microfungal populations. Fungal abundance was determined by dilution plate technique, and the identification of fungi was based on morphological characteristics. Pearson’s correla...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تهران 1370

حوضه آبخیز سدمخزنی شهید پارسا در جنوب شرقی شهرستان فردوس استان خراسان واق گردیده است . بااحداث این سد علاوه برآبیاری اراضی موجود، 700 هکتار از اراضی جدید پایین دست به زیر کشت می روند. عمده ترین معضل موجود در رابطه با حوضه آبخیز، وجود بار رسوب فراوان و تجمع آن در پشت مخزن سد می باشد. لذابه علت عدم وجود اطلاعات کافی از وضعیت فرسایش خاک در حوضه آبخیز، دراین رساله بررسی و مطالعه فرسایش پذیری خاک ان...

2007
M. López-Vicente

Papers published in Hydrology and Earth System Sciences Discussions are under open-access review for the journal Hydrology and Earth System Sciences Abstract The Mediterranean environment is characterized by strong temporal variations in rainfall volume and intensity, soil moisture and vegetation cover along the year. These factors play a key role on soil erosion. The aim of this work is to ide...

2018
Omid Oudbashi

Characterization of soil corrosivity in archaeological sites is an important subject to understand the conservation conditions of archaeological bronze collections and helps conservators to prepare a conservation strategy for long term preservation of bronze objects. In this paper, a research approach is established to identify soil corrosivity in two archaeological sites and to find correlatio...

2013
Xuyang Lu Jihui Fan Yan Yan Xiaodan Wang

Soil microbial biomass and enzyme activities have an important influence on nutrient cycling. The temporal variation in soil microbial biomass C, N, and enzyme activities during the growing season were determined under three different alpine grasslands in Northern Tibet. The results showed that soil microbial biomass C, and N contents and enzyme activities of the alpine meadow (AM) and the alpi...

Generally, the evaluation and assessment critical condition of rill formation are useful for a better understanding of soil erosion processes. The inherence characteristics of soils, which have much dynamic variations on the hill-slopes and are affected by rill formation, are the soil critical shear stress and soil erodibility factors. This study aims to assess experimental rill incision thre...

2002
JOSEPH M. CRAINE DAVID A. WEDIN

Soil CO2 flux was measured across 947 plots at 7 experimental grassland sites at the Cedar Creek Natural History Area in order to determine the relationships between soil CO2 flux and environmental factors, living plant biomass, and soil C and N. Soil CO2 flux increased as the day progressed, and was positively related to aboveground biomass, belowground biomass, and soil % C. However, most of ...

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