نتایج جستجو برای: density of forbs

تعداد نتایج: 21193008  

The rangeland in the Khangai mountain region in Mongolia has degraded for the last decades mainly because of overgrazing and climate change. Livestock production is important part of the economy and is based on natural rangeland. In this research we seek to elucidate the influence of five years (2004-2009) of protection from grazing on vegetation cover of different degradation levels of Fes...

Journal: :Ecosystems 2021

Abstract Increasing atmospheric CO 2 enhances plant biomass production and may thereby change nutrient concentrations in tissues. The objective of this study was to identify the effect elevated on grassland that have been grown for 16 years (1998–2013). at extensively managed Giessen FACE experiment, fumigated with ambient (aCO ; eCO +20%) harvested twice annually. Concentrations C, N, P, K, Ca...

2006
ROGER L. SHELEY JANE M. MANGOLD JENNIFER L. ANDERSON

Ecologists are searching for models, frameworks, and principles that provide a bridge between theory and the practice of restoration. Successional management has been proposed as a useful model for managing and restoring invasive-plant-dominated rangeland because it provides a framework in which ecological processes can be manipulated by managers to achieve a desired plant community. Succession...

Journal: :Urban Forestry & Urban Greening 2022

To achieve enduring low-maintenance green roofs that provide maximum benefit in the subtropics, plants need to be well adapted local climate with extensive coverage. The use of native contributes ecological restoration, yet there is very limited information available on their performance subtropics. This study aimed determine nine species Australian forbs, succulents, and grasses monofunctional...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1388

abstract sensitive and precise voltammetric methods for the determination of trace amounts of furaldehydes, mainly as furfural (f) and 5-hydroxymethyl-2-furaldehyde (hmf), in waste waters and other matrices is described. determination of total furaldehyde at < ?g g-1 levels in alkaline buffered aqueous media was individually investigated. by the use of ordinary swv and adsorptive square wave ...

2011
THOMAS P. ROONEY MARK K. LEACH

We examined changes in plant species composition at * avilie Fraine in southeastern Wisconsin, based on surveys in permanently-marked, 2 X 2 m quadrats in 19461948, 1976-1978 and 2005. Permanent quadrats were distributed across a wide soil moisture gradient. During settlement he site was never cultivated but was mowed for hay for several decades prior to 1946, and burned most years during the d...

Journal: :nanomedicine research journal 0
amirali abbasi molecular simulation laboratory (msl), azarbaijan shahid madani university, tabriz, iran jaber jahanbin sardroodi molecular simulation laboratory (msl), azarbaijan shahid madani university, tabriz, iran

objective(s): adsorption of immucillin-a (bcx4430) molecule on the pristine and n-doped tio2 anatase nanoparticles were studied using the density functional theory (dft) calculations. the adsorption energy analysis indicated that tio2+immucillin-a complexes including oc-substituted tio2 have higher adsorption energy than the complexes with ot substituted tio2, thus providing more stable configu...

Journal: :international journal of nano dimension 0
amirali abbasi molecular simulation laboratory (msl), azarbaijan shahid madani university, tabriz, iran.سازمان اصلی تایید شده: دانشگاه شهید مدنی (azarbaijan shahid madani university)سازمان های دیگر: 2 computational nanomaterials research group, azarbaijan shahid madani university, tabriz, iran 3 department of chemistry, faculty of basic sciences, azarbaijan shahid madani university, tabriz, iran jaber jahanbin sardroodi molecular simulation laboratory (msl), azarbaijan shahid madani university, tabriz, iran.سازمان اصلی تایید شده: دانشگاه شهید مدنی (azarbaijan shahid madani university)سازمان های دیگر: 2 computational nanomaterials research group, azarbaijan shahid madani university, tabriz, iran 3 department of chemistry, faculty of basic sciences, azarbaijan shahid madani university, tabriz, iran

we have performed density functional theory investigations on the adsorption properties of ammonia molecule on the undoped and n-doped tio2 anatase nanoparticles. we have geometrically optimized the constructed undoped and n-doped nanoparticles in order to fully understand the adsorption behaviors of ammonia molecule. for tio2 anatase nanoparticles, the binding site is preferentially located on...

Journal: :Ecological applications : a publication of the Ecological Society of America 2013
Wilfred O Odadi Moses K Karachi Shaukat A Abdulrazak Truman P Young

It is believed that wildlife and livestock can coexist in semiarid savanna rangelands. However, this coexistence is threatened by intense competition for scarce, but nutritionally vital, forage resources. Specifically, there is evidence that grazing livestock seasonally compete for protein-rich forbs (non-grasses) with browsing and mixed-feeding wildlife. While this has been attributed to prote...

2015
Ángel de Frutos Teresa Navarro Yolanda Pueyo Concepción L. Alados

Predicting the capacity of ecosystems to absorb impacts from disturbance events (resilience), including land-use intensification and landscape fragmentation, is challenging in the face of global change. Little is known about the impacts of fragmentation on ecosystem functioning from a multi-dimensional perspective (multiple traits). This study used 58 500-m linear transects to quantify changes ...

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