With the degradation of global lake ecosystem, aquatic plants are more and widely used in ecological restoration. The effects water depths on growth photosynthetic fluorescence characteristics two emergent (Typha orientalis Zizania caduciflora) were studied eutrophic Lake Gehu by in-situ experiments. results showed that depth had no significant effect germination plants. changed morphological P...

The radial and longitudinal distribution of absorbed dose in a water phantom irradiated with 10 GeV electrons has been measured. The electron beam was well focussed, and the current was measured accurately with a toroid. Detector plates, containing arrays of thermoluminescent 7LiF dosimeters were inserted at different depths in the water tank. The profiles of the dose distribution were measured...

Understanding the spatial distributions of soil water, temperature and nutrients as well their effects on maize growth grain yield is vital for optimizing drip fertigation regimes. In this study, a 2 year field experiment was conducted drip-fertigated spring with plastic mulching in arid northwestern China 2015 2016. Four irrigation levels were set: I60 (60% ETc; ETc crop evapotranspiration), I...

abstract information on spatial and temporal variations of soil hydraulic conductivity (k) is essential to improve soil and water management. however several techniques have been proposed for measuring of soil hydraulic conductivity above water surface table, but reliability and easy use of these methods in various conditions were always concern for engineers. the purposes of this study are mea...

in order to assess the adaptation of elaeagnus angustifolia l. and fraxinus rotundifolia mill afforestation around tabriz international airport, the qualitative and quantitative characteristics of trees were measured in 96 experimental circular plots with a size of 300 m2. to study the edaphic effects of these species, nine samples were randomly collected from 0-10 cm and 10-20 cm depth of soil...

Predation by visual predators is often affected by light conditions and may therefore exhibit strong diel variation. The dominant predators on grass shrimp, Palaemonetes pugio, are finfish predators that are thought to locate their prey by visual cues. We examined the response of grass shrimp to diel variation in predation risk in the nearshore shallow waters of the Chesapeake Bay. We used diel...

BACKGROUND The hydrological cycle is an important way of transportation and reallocation of reactive nitrogen (N) in forest ecosystems. However, under a high level of atmospheric N deposition, the N distribution and cycling through water flows in forest ecosystems especially in bamboo ecosystems are not well understood. METHODOLOGY/PRINCIPAL FINDINGS In order to investigate N fluxes through w...

Introduction:  On  the  basis  of  percent  depth  dose  (PDD)  calculation,  the  application  of  dosimetry  in  radiotherapy  has  an  important  role  to  play  in  reducing  the  chance  of  tumor  recurrence. The aim of this study is to introduce a new formula for calculating the centeral axis  percent depth doses of Cobalt-60 beam.   Materials and Methods: In the present study, based on ...

This study addresses the adaptation of Nitraria sphaerocarpa to blown sand at the edge of a desert oasis with regard to the aspects of soil seed banks, seedlings, and population. Horizontally, the total number of seeds per unit area decreased from the shrub canopy center to intershrub areas, and most seeds were found under shrub canopies. Vertically, the highest proportion of seeds was found at...

Sustainable soil and crop management practices that reduce soil erosion and nitrogen (N) leaching, conserve soil organic matter, and optimize otton and sorghum yields still remain a challenge. We examined the influence of three tillage practices (no-till, strip till and chisel till), four cover rops {legume [hairy vetch (Vicia villosa Roth)], nonlegume [rye (Secaele cereale L.)], vetch/rye bicu...