scholarly journals Water-Holding Characteristics of Litter in Meadow Steppes with Different Years of Fencing in Inner Mongolia, China

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2374
Author(s):  
Jingjie Xie ◽  
Derong Su
Keyword(s):  
Key Factors ◽  
Litter Accumulation ◽  
Leaf Mass ◽  
Positive Linear Correlation ◽  
Restoration Measure ◽  
Organic Community ◽  
Important Means ◽  
Maximum Water ◽  
Water Holding ◽  
Stem Leaf

As a main restoration measure to address degraded grasslands, the installation of fences is often accompanied by accumulation of organic litter. This accumulated litter is a layer of physical moisture which intercepts rainfall and may inhibit plant growth and development. One of the important means to judge a reasonable length of time of fencing (the time a fence is present) is through assessing the water-holding mechanism and capacity of the litter. In this study, four meadows in the Chinese Hulunbuir grassland with different years of fencing duration were investigated in order to obtain data on organic community and litter accumulation. A soaking method was used to study water-holding characteristics of the litter and was divided into three parts of stem, leaves and decomposed parts as a means to summarize the water-holding mechanism within the litter. The results showed that: (1) Compared with the light grazing meadows, the diversity and uniformity of communities in meadows of fencing displayed a downward trend, while the accumulation of litter increased. (2) The stems, leaves, and decomposed components of litter in different communities showed a highly positive linear correlation with their maximum water-holding capacity (WHC). This indicates that the stem/leaf mass ratio and decomposition degree of litter are key factors in regulating WHC. (3) Based on this understanding, we established a model based on stem and leaf mass to predict the water-holding potential of litter in real world situations.

scholarly journals Litter Ecohydrological Function Characteristics of Three Typical Plant Communities in The Core Area of Five-Hundred-Meter Aperture Spherical Radio Telescope from Guizhou, China

2021 ◽  
Author(s):  
Jianli Zhang ◽  
Ting Zhang ◽  
Lihua Pu ◽  
Lingbin Yan ◽  
Guojun Cai ◽  
...  
Keyword(s):  
Water Absorption ◽  
Plant Communities ◽  
Coniferous Forest ◽  
Water Holding Capacity ◽  
Litter Layer ◽  
Broad Leaved Forest ◽  
Maximum Water ◽  
And Storage ◽  
Water Holding ◽  
Leaved Forest

Abstract Taking the litter layer of three typical plant communities (broad-leaved forest, coniferous forest, and shrubs) as the research object, this study analyzed the hydrological function characteristics of the litter layers of different typical plant communities using the indoor immersion method in order to reveal the effects of the traits of the litter layer on the hydrological functions of typical plant communities in the core area. The results showed that: (1) the litter reserve change trend decreased in order as follows: broad-leaved forest (13.31 ± 1.54 t/hm2) > shrubs (12.62 ± 2.34 t/hm2) > coniferous forest (11.36 ± 1.43 t/hm2). The coniferous forest and shrub litter reserves increased significantly with the increase of decomposition degree (F = 19.36, P < 0.01; and F = 9.19, P < 0.01, respectively), while the broad-leaved forest litter reserves decreased first and then increased significantly with the increase of decomposition degree (F = 25.70, P < 0.01); (2) the litter natural moisture content change trends were as follows: shrubs (34.09 ± 4.31 t/hm2) > broad-leaved forest (31.32 ± 1.76 t/hm2) > coniferous forest (29.48 ± 7.02 t/hm2). The change trends of the maximum water-holding capacity, maximum interception amount, maximum interception rate, effective interception amount, and effective interception rate were in descending order as follows: broad-leaved forest > shrubs > coniferous forest. The maximum water-holding capacity, maximum interception amount, and effective interception amount of litter rose with the increase of decomposition degree. The broad-leaved forest community litter layer had the strongest rainfall interception function and the best hydrological service functions. The interception function was stronger with the increase of the decomposition degree of the litter layer; (3) the water-holding and water-releasing capacity variation of the litter layers manifested as reversed “J” features for the three typical plant communities. The water-holding capacity of different plant community litter layers (Qct) was significantly positively correlated with time (t) (P < 0.01), and the equation was Qct = b + alnt, whereas the water-releasing capacity of different plant community litter layers (Qst) was significantly positively correlated with time (t) (P < 0.01), and the equation was Qst = a t b; and (4) the water absorption and release rates of the litter layers had four periods. The water absorption rate (v) was significantly negatively correlated with time (t) (P < 0.01), and the equation was v = a t− b, while the water release rate was the same. The water absorption and release rates differed by one order of magnitude in the first 5 min, exhibiting the greatest regulation and storage function, while the rate differed by only 2.1–4.5 times during the last three periods. This shows that the litter layer has the strongest rainfall regulation and storage function for only a short period of time before declining.

The influence of biochar particle size and concentration on bulk density and maximum water holding capacity of sandy vs sandy loam soil in a column experiment

Geoderma ◽  
2019 ◽  
Vol 347 ◽  
pp. 194-202 ◽  
Author(s):  
Frank G.A. Verheijen ◽  
Anna Zhuravel ◽  
Flávio C. Silva ◽  
António Amaro ◽  
Meni Ben-Hur ◽  
...  
Keyword(s):  
Particle Size ◽  
Bulk Density ◽  
Sandy Loam ◽  
Column Experiment ◽  
Water Holding Capacity ◽  
Sandy Loam Soil ◽  
Loam Soil ◽  
Maximum Water ◽  
Water Holding

How to Start or Improve a KM System in a Hospital or Healthcare Organization

2011 ◽  
pp. 1395-1398
Author(s):  
A.H. Rubenstein ◽  
E. Geisler
Keyword(s):  
Knowledge Management ◽  
Health Sector ◽  
Healthcare Organization ◽  
Management Systems ◽  
Knowledge Management Systems ◽  
Key Factors ◽  
Important Means

One of the key factors that distinguishes enterprises of the 21s t Century is the emphasis on knowledge and information. Knowledge management is an important means by which organizations can better manage information, and more importantly, knowledge. Unlike other techniques, knowledge management is not always easy to define, because it encompasses a range of concepts, management tasks, technologies, and practices, all of which come under the umbrella of the knowledge management. This chapter deals with two aspects of knowledge management systems: (a) why KM systems are needed, and (b) how to get started on designing and rolling out a new or improved KM system. The inferences are drawn from the direct experiences the authors have had during their academic and consulting activities in many health sector organizations.

scholarly journals Stability of the Meat Protein Type I Collagen: Influence of pH, Ionic Strength, and Phenolic Antioxidant

Foods ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 480 ◽  
Author(s):  
Massimo Lucarini ◽  
Alessandra Durazzo ◽  
Fabio Sciubba ◽  
Maria Enrica Di Cocco ◽  
Raffaella Gianferri ◽  
...  
Keyword(s):  
Ionic Strength ◽  
1H Nmr ◽  
Type I Collagen ◽  
Phenolic Antioxidants ◽  
Type I ◽  
Key Factors ◽  
Hydration Properties ◽  
Collagen Stability ◽  
Water Holding

The water-holding capacity (WHC) is among the key factors in determining the quality of meat and its value, which is strongly influenced by the content and quality of the connective tissue proteins like collagen. Therefore, the factors that influence the proteins’ stability, e.g., pH, ionic strength, and the antioxidants which are used to increase the meat shelf-life, also affect the WHC. The interaction of collagen, whose structure is strongly influenced by the interaction with water molecules, can be studied following the behavior of water diffusion by low-resolution 1H NMR experiments. The present study is addressed to study the collagen stability as a function of pH, ionic strength, and phenolic antioxidants like catechin. The experimental study demonstrated how the 1H NMR time domain (TD) experiments are able to evaluate the hydration properties of collagen, not only as a function of ionic strength and pH, but also in determining the ability of catechin to interact both on the surface of the collagen fibrils and inside the fibrillar domain.

scholarly journals Gypsum incubation tests to evaluate its potential effects on acidic soils of Colombia

2020 ◽  
Vol 73 (3) ◽  
pp. 9349-9359
Author(s):  
Jorge Enrique Cuervo-Alzate ◽  
Nelson Walter Osorio
Keyword(s):  
Acid Soils ◽  
Tropical Soils ◽  
Plant Nutrient ◽  
Ag Addition ◽  
Exchangeable Ca ◽  
Exchangeable Al ◽  
Maximum Water ◽  
Physical And Chemical ◽  
Water Holding ◽  
Low Solubility

Tropical soils are characterized by acidity and poor plant nutrient availability, limiting their agricultural productivity. These soils are commonly amended with lime, but its low solubility impairs its effectiveness to enhance soil fertility. The use of gypsum has gained attention among farmers due to its higher solubility and mobility in the soil, local accessibility, and low price. Therefore, this study was conducted to determine the effects of Agricultural Gypsum (AG) addition on ten Colombian acid soils that had poor fertility and contrasting their physical and chemical characteristics. Surface (0-20 cm) soil samples were air-dried, sieved (<2 mm), and transferred into plastic vases, 40 g (dry base) per vase. Increasing rates of gypsum were added by duplicate: 0.0, 0.25, 0.5, 1.0, 2.0, 4.0, 8.0, and 16.0 g kg-1. Then, the soils were incubated for two weeks and watered to maintain 50% of their maximum water holding capacity. Soil pH, Al+3, Ca+2, Mg+2, K+, S-SO4-2, and P-H2PO4-2 were measured using standard methods. The results showed that AG addition significantly (P<0.05) increased soil exchangeable Ca+2-K+, Ca+2 saturation, S-SO4-2 concentration, and exchangeable Al+3, particularly with doses above 4.0 g kg-1. In contrast, soil Al+3 saturation, P-H2PO4-2 and pH significantly decreased as the AG doses increased, while soil exchangeable Mg+2 levels were not significantly affected. The use of gypsum incubation tests could be promissory for its effects on soil amelioration associated mainly to increase soil exchangeable Ca2+ and S-SO 42- and to decrease Al3+ saturation.

How to Start or Improve a KM System in a Hospital or Healthcare Organization

2005 ◽  
pp. 44-49 ◽  
Author(s):  
A. H. Rubenstein ◽  
E. Geisler
Keyword(s):  
Knowledge Management ◽  
21St Century ◽  
Health Sector ◽  
Healthcare Organization ◽  
Management Systems ◽  
Knowledge Management Systems ◽  
Key Factors ◽  
Important Means

One of the key factors that distinguishes enterprises of the 21st Century is the emphasis on knowledge and information. Knowledge management is an important means by which organizations can better manage information, and more importantly, knowledge. Unlike other techniques, knowledge management is not always easy to define, because it encompasses a range of concepts, management tasks, technologies, and practices, all of which come under the umbrella of the knowledge management. This chapter deals with two aspects of knowledge management systems: (a) why KM systems are needed, and (b) how to get started on designing and rolling out a new or improved KM system. The inferences are drawn from the direct experiences the authors have had during their academic and consulting activities in many health sector organizations.

Soils of Thotapalli Major Irrigation Project of North- Coastal Andhra Pradesh: Physical and Chemical Properties

Agropedology ◽  
2019 ◽  
Vol 29 (1) ◽  
Author(s):  
K. Himabindu ◽  
◽  
P. Gurumurthy ◽  
P.R.K. Prasad ◽  
◽  
...  
Keyword(s):  
Andhra Pradesh ◽  
Pore Space ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Clay Loam ◽  
Irrigation Project ◽  
Maximum Water ◽  
Physical And Chemical ◽  
Water Holding ◽  
And Chemical Properties

Physical and chemical properties of the soils were assessed for the ayacut area of Thotapalli major irrigation project of North-Coastal Andhra Pradesh. Six representative soil pedons were studied in Devarapalli, Gujjangivalasa, Patikivalasa, Gangada, Aamiti and Maddivalasa villages falling in ayacut area of Thotapalli major irrigation project. The soil texture ranged from sandy loam to sandy clay loam in upland pedons while sandy clay loam to clay in pedons under cultivated plains. In general, relatively low bulk density was recorded at surface horizons compared to sub-surface layers. Maximum water holding capacity, pore space and volume expansion increased with soil depth. The soils were acidic to alkaline in reaction, non-saline, low to medium in organic carbon content. The CEC ranged from 6.4 to 32.5 cmol (p+) kg-1. The soil exchange complex was dominated by calcium followed by magnesium, sodium and potassium. The soils were found to be low in nitrogen, low to medium in phosphorus and medium to high in available potassium status. Manganese and copper were sufficient but zinc and iron were deficient in soils. The total silica (SiO2) content of pedons varied from 48.10 to 71.40 per cent. Sesquioxide (R2O3) and the molar ratio of SiO2 / R2O3 ranged from 19.01 to 32.4 per cent and varied from 3.74 to 6.59, respectively in different pedons. The SiO2 / Al2O3 ratio and the SiO2 / Fe2O3 ratio varied from 4.43 to 7.65 and from 13.7 to 47.8, respectively. A significant positive correlation of clay content with cation exchange capacity (CEC), maximum water holding capacity (MWHC) was observed. Sand content was positively correlated with silica and negatively correlated with MWHC and volume expansion. Soil organic carbon had a significant positive correlation with soil pore space, available nitrogen, phosphorous, potassium, zinc, manganese, copper and iron, but a negative correlation with soil bulk density. Soil pH was positively correlated with CaCO3 but negatively correlated with available phosphorous, potassium, zinc, manganese, and copper and iron. Soil CaCO3 content was negatively correlated with available phosphorous, potassium, zinc, manganese, copper and iron of the soil.

scholarly journals Use of phosphatase and dehydrogenase activities in the assessment of calcium peroxide and citric acid effects in soil contaminated with petrol

2020 ◽  
Vol 15 (1) ◽  
pp. 12-20 ◽  
Author(s):  
Kornel Curyło ◽  
Arkadiusz Telesiński
Keyword(s):  
Alkaline Phosphatase ◽  
Enzyme Activity ◽  
Citric Acid ◽  
Soil Samples ◽  
Soil Ecosystem ◽  
Calcium Peroxide ◽  
Uncontaminated Soil ◽  
Maximum Water ◽  
The Impact ◽  
Water Holding

AbstractThe objective of the study was to compare the effect of calcium peroxide and citric acid on the activity of acid phosphatase (ACP), alkaline phosphatase (ALP), and dehydrogenases (DHA) in uncontaminated soil and soil contaminated with petrol. The experiment was carried out on samples of loamy sand under laboratory conditions. Petrol was introduced to soil samples at a dose of 0 and 50 g·kg 1 DM, as well as calcium peroxide or citric acid at a dose of 0, 50, 100, or 150 mg·kg 1 DM. The humidity of the samples was brought to 60% maximum water holding capacity, and the samples were incubated at 20°C for 8 weeks. Enzyme activity was determined on days 1, 14, 28, and 56. The obtained results demonstrated that the addition of calcium peroxide and citric acid did not result in significant changes in the activity of the determined enzymes in uncontaminated soil. However, it was observed that the application of calcium peroxide, particularly at the dose of 150 mg·kg 1 DM, largely alleviated the impact of petrol on the enzymatic activity of the soil contaminated with petrol. Moreover, among the determined enzymes, the activity of DHA was found to be the best indicator of the effect of calcium peroxide on the soil ecosystem.

scholarly journals Changes in maximum water holding capacity of chernozem soil caused by soil compaction

2021 ◽  
Vol 262 ◽  
pp. 03003
Author(s):  
Yuriy Bekhovykh ◽  
Larisa Bekhovykh ◽  
Aleksey Lyoevin ◽  
Evgeniy Sizov
Keyword(s):  
Soil Moisture ◽  
Soil Compaction ◽  
Soil Cover ◽  
External Pressure ◽  
Pressure Level ◽  
Water Holding Capacity ◽  
Chernozem Soil ◽  
Initial Value ◽  
Maximum Water ◽  
Water Holding

The goal of the studies presented in the work is to estimate the changes in the maximum water holding capacity of the soil caused by soil compaction. The object of the research is a loam type of chernozem soil. The research shows that the maximum water holding capacity is a function of the soil density change and indirectly depends on the action of soil compaction factors, including external pressure level, the number of impacts on soil cover, as well as on soil moisture. Soil moisture is indicated as the most important factor in changing the maximum water holding capacity caused by soil compaction. The decrease in the maximum water holding capacity caused by soil compaction is more obvious with an increase in soil moisture, both in the research of the number of impacts and external pressure influence on this indicator. The results of the work show that the change in the maximum water holding capacity caused by a compacting action significantly depends on the initial value of the soil addition density.

scholarly journals Morpho-physical Properties of Soils of Kanamadi South Sub-watershed of Karnataka

2021 ◽  
pp. 12-25
Author(s):  
Ashay D. Souza ◽  
P. L. Patil
Keyword(s):  
Physical Properties ◽  
Bulk Density ◽  
Water Conservation ◽  
Clay Content ◽  
Field Capacity ◽  
Soil Survey ◽  
Soil Productivity ◽  
Maximum Water ◽  
Irs P6 Liss Iv ◽  
Water Holding

An investigation was carried out to determine the morpho-physical status of soils of Kanamadi South sub- watershed in Karnataka state of India. A detailed soil survey of Kanamadi South sub watershed was carried out using IRS P6 LISS-IV image and a total of ten pedon location  which were well distributed in Kanamadi South sub-watershed was selected. The soils were shallow to deep. Colour of pedons varied from 10 YR 2/1 (black) to 10 YR 4/3 (brown). Soil texture varied from clay to clay loam, having loose to moderately subangular to angular blocky in structure with few fine roots distributed in surface horizons. Generally, the clay content increased with depth. Consistency of soil pedons ranged from slightly hard to hard when dry, friable to firm when moist, slightly sticky to very sticky and slightly plastic to very plastic when wet. The maximum water holding capacity of soil horizons ranged from 59.65 to 79.15 per cent and generally increased down the depth. The bulk density of pedons varied from 1.17 to 1.37 Mg m-3. In general, bulk density varied with depth with lowest bulk density at surface and highest recorded in sub surface depths. The field capacity varied from 28.21% to 41.32 %.The morphological and physical properties study in area helps for resource inventorization for successful watershed planning for soil and water conservation to enhance the potential of fertility of soils and major fertility enhancement to increase the soil productivity.

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