نتایج جستجو برای: soil changes

تعداد نتایج: 1036843  

Using seasonal floods is very important in arid and semi arid areas. Suspended sediments in the flood are caused changes in soil properties. The aim of this study is to investigate the soil chemical and physical properties affected by low quality floods irrigation. Sampling from three phases, in each phase three points (beginning, middle and end of the row) and in the depths of 30-0, 60-30 and ...

2017
Ziting Wang Tong Li Xiaoxia Wen Yang Liu Juan Han Yuncheng Liao Jennifer M. DeBruyn

Conservation tillage is an extensively used agricultural practice in northern China that alters soil texture and nutrient conditions, causing changes in the soil microbial community. However, how conservation tillage affects rhizosphere and bulk soil fungal communities during plant growth remains unclear. The present study investigated the effect of long-term (6 years) conservation (chisel plow...

Journal: :تحقیقات آب و خاک ایران 0
ابراهیم مقیسه دانشجوی دکتری، دانشگاه تهران و بورسیه پژوهشگاه علوم و فنون هسته ای احمد حیدری استادیار، دانشگاه تهران محمد قنادی مراغه استاد، پژوهشگاه علوم و فنون هسته ای حسن توفیقی دانشیار، دانشگاه تهران فریدون سرمدیان دانشیار، دانشگاه تهران مصطفی کریمیان اقبال دانشیار، دانشگاه تربیت مدرس

an important part of carbon cycling is carried out in the soil making land use changes, including changes in forestlands, affect soc storage and consequently co2 flux into the atmosphere.the aims followed in this investigation were to study the impacts of conversion of deciduous forests to coniferous ones and deforested land to rangelands, on some of the soil physicochemical properties, organic...

2013
Yanhong Li Huimei Wang Wenjie Wang Lei Yang Yuangang Zu

Limited data are available on the ectomycorrhizae-induced changes in surface structure and composition of soil colloids, the most active portion in soil matrix, although such data may benefit the understanding of mycorrhizal-aided soil improvements. By using ectomycorrhizae (Gomphidius viscidus) and soil colloids from dark brown forest soil (a good loam) and saline-alkali soil (heavily degraded...

Different numerical and analytical models are presently available that provide the tools to predict pollutant and water transfer processes between the soil surface and the groundwater level. Among the existing models, the Hydrus-1D model has been used for years in the prediction of water and pollutants transfer in the unsaturated zone. The main purpose of this paper was to model the movement of...

Different land uses have various effects on the changes of soil properties. The purpose of this study was to evaluate the effects of natural forest, needle-leaved plantation and rangelands of central Alborz on new indices of soil quality (i.e. organic matter stratification, carbon management index and soil biological activities). For this purpose, eight samples from organic layer (litter) and m...

Journal: :Global change biology 2012
Jonathan W Leff William R Wieder Philip G Taylor Alan R Townsend Diana R Nemergut A Stuart Grandy Cory C Cleveland

Global changes such as variations in plant net primary production are likely to drive shifts in leaf litterfall inputs to forest soils, but the effects of such changes on soil carbon (C) cycling and storage remain largely unknown, especially in C-rich tropical forest ecosystems. We initiated a leaf litterfall manipulation experiment in a tropical rain forest in Costa Rica to test the sensitivit...

2014
Marion Schrumpf Klaus Kaiser Ernst-Detlef Schulze

Temperate forests are assumed to be organic carbon (OC) sinks, either because of biomass increases upon elevated CO2 in the atmosphere and large nitrogen deposition, or due to their age structure. Respective changes in soil OC and total nitrogen (TN) storage have rarely been proven. We analysed OC, TN, and bulk densities of 100 soil cores sampled along a regular grid in an old-growth deciduous ...

ژورنال: علوم آب و خاک 2014
جعفری, سیروس, نادیان, حبیب‌اله,

The aim of this study was to evaluate soil properties changes in a soil toposequence series in Khuzestan province. Twelve soil profiles were dug in north to south direction in this province, according to the changes of the slope in Karoon’s alluvial deposits. The results showed that soil texture regularly changes to heavier form from north to south. It was slightly of redoxomorphic featur...

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