scholarly journals Spatial–Temporal Wetland Landcover Changes of Poyang Lake Derived from Landsat and HJ-1A/B Data in the Dry Season from 1973–2019

2020 ◽  
Vol 12 (10) ◽  
pp. 1595 ◽  
Author(s):  
Sa Wang ◽  
Lifu Zhang ◽  
Hongming Zhang ◽  
Xingxing Han ◽  
Linshan Zhang
Keyword(s):  
Driving Forces ◽  
Poyang Lake ◽  
Central Zone ◽  
Dry Season ◽  
Mountainous Area ◽  
Detailed Knowledge ◽  
Ecological Value ◽  
Factors Affecting ◽  
Wetland Evolution ◽  
Poyang Lake Wetland

As China’s largest freshwater lake and an important wintering ground for white cranes in Asia, the Poyang Lake wetland has unique ecological value. However, wetland cover types have changed dynamically and have attracted the attention of society and researchers over the past few decades. To obtain detailed knowledge and understanding of the long-term landcover dynamics of Poyang Lake and the associated driving forces, Landsat and HJ-1A/B images (31 images) were used to acquire classification and frequency maps of Poyang Lake in the dry season from 1973–2019 based on the random forest (RF) algorithm. In addition, the driving forces were discussed according to the Geodetector model. The results showed that the coverage of water and mudflat showed opposite trends from 1987–2019. Water and vegetation exhibited a significant decreasing trend from 1981–2003 and from 1996–2004 (p < 0.01), respectively. A phenomenon of vegetation expanding from west to east was found, and the expansion areas were mainly concentrated in the central zone of Poyang Lake, while vegetation in the northern mountainous area of Songmen (region 1) and eastern Songmen Mountain (region 2), showed a significantly expanded trend (R2 > 0.6, p < 0.01) during the five-decade period. The year-long dominant distribution of water occurred mainly in the two deltas formed by the Raohe and Tongjin rivers and the Fuhe and Xinjiang rivers, with deep water. In the 1973–2003 and 2003–2019 periods, a total of 313.522 km2 of water turned into swamp and mudflat and 478.453 km2 of swamp and mudflat transitioned into vegetation, respectively. Elevation and temperature appeared to be the main factors affecting the regional wetland evolution in the dry season and should be considered in the management of Poyang Lake. The findings of this work provide detailed information for spatial–temporal landcover changes of Poyang Lake, which could help policymakers to formulate scientific and appropriate policies and achieve restoration of the Poyang Lake wetland.

Factors affecting the phenology of the first brood of the sugar-cane froghopper Aeneolamia varia saccharina (Dist.) (Homoptera, Cercopidae) in Trinidad

1975 ◽  
Vol 65 (3) ◽  
pp. 359-372 ◽  
Author(s):  
A. B. S. King
Keyword(s):  
Adult Emergence ◽  
Dry Season ◽  
Soil Conditions ◽  
Factors Affecting ◽  
Expected Time ◽  
Short Period ◽  
Incubation Periods ◽  
Close Relationship ◽  
Dry Soil ◽  
Predictive Relationship

AbstractThe size and occurrence of the first brood of adults of Aeneolamia varia saccharina (Dist.) are examined in relation to the pattern of egg eclosion and rainfall. The proportion of eggs hatching within a month of oviposition in the laboratory (short-period eggs) decreased from over 90% in August to less than 20% in January, but the incubation periods of the remaining, long-period eggs were longest in those laid during October and November. The overall hatching distributions tended to be bimodal with most eggs hatching during the early months of the year under moist conditions at 26°C. Dry soil conditions delay eclosion, and eggs obtained from fields during the dry season and then incubated under moist conditions tended to hatch at the normally expected time of the first rains in May. The numbers of eggs expected to produce the first brood, computed from laboratory hatching data and estimates of the numbers and fecundities of froghoppers during the second, third and fourth broods, were less than the actual numbers sampled just before the first rains. There was a close relationship between the first rainfall of over one inch within 48 h and adult emergence 27 and 34 days later, and 85% of field egg populations in May had hatched and/or died by the week after the first rains. However some variation in the date of their occurrence accounted for non-synchrony of first broods over the region. The numbers of diapause eggs in fields sampled during the dry season failed to give a good predictive relationship with first brood adult populations, probably because of density dependent mortality of eggs or hatchling nymphs.

scholarly journals Do Innovation and Offshoring Make a Difference? An Empirical Exploration of the Effects on the Performance of European Firms

2016 ◽  
Vol 9 (7) ◽  
pp. 98 ◽  
Author(s):  
Pinuccia Calia ◽  
Ida D'Attoma ◽  
Silvia Pacei
Keyword(s):  
Economic Performance ◽  
Driving Forces ◽  
Manufacturing Firms ◽  
Point Of View ◽  
Firm Characteristics ◽  
Factors Affecting ◽  
Self Selection ◽  
Firm Profitability ◽  
Selection Mechanisms ◽  
The Eu

<p>This study attempts to answer the question of whether European manufacturing firms that undertake offshoring, innovation or both benefit from higher productivity and profitability. From a methodological point of view, the driving forces that push firms to innovate and/or to offshore can be seen as self-selection mechanisms that make the estimation of their economic impact more difficult if the confounding factors affecting these mechanisms also affect the economic performance of the firms. To disentangle the effect of both offshoring and innovation on firms’ performances from the effect of firm characteristics, the propensity score matching methodology in a multi-overlapping treatment setting is used.<strong> </strong>The study targets European countries using the EU-EFIGE/Bruegel-Unicredit dataset. Decisions to offshore and innovate do not seem to have a significant effect on productivity, whereas the decision to innovate only has a significant effect on firm profitability.<strong> </strong></p>

scholarly journals Analytical support of management accounting in managing sustainable development of agricultural organizations

2020 ◽  
Vol 164 ◽  
pp. 10008
Author(s):  
Alsou Zakirova ◽  
Guzaliya Klychova ◽  
Gamlet Ostaev ◽  
Zariya Zalilova ◽  
Aigul Klychova
Keyword(s):  
Sustainable Development ◽  
Environmental Sustainability ◽  
Agricultural Sector ◽  
Driving Forces ◽  
Management Accounting ◽  
Industrial Complex ◽  
The Sustainable Development ◽  
Factors Affecting ◽  
Economic Entity ◽  
Agricultural Organizations

Management accounting of an economic entity in the agricultural sector is a complex multidimensional system. Sustainable development of the subject of business in the agro-industrial complex depends on many heterogeneous factors and conditions, which are understood as the reasons (driving forces) of any process determining its character or its separate features. The order of making decisions depends on the functioning of management accounting. In the context of diversity and heterogeneity of factors, a high degree of their uncertainty, complexity of interactions, study of these factors is a serious problem. Therefore, management personnel should carry out a constant analysis of all factors affecting the enterprise and assess their interaction, which reflects the cause-and-effect relations that characterize the sustainable development of the agro-industrial complex. The aim of the article is the justification of theoretical provisions and the development of practical recommendations for the development of analytical support of management accounting in the management of sustainable development of agricultural organizations. Objectives of the research: to study theoretical aspects and methodological tools, to determine the set of factors of sustainable development of a business entity, to develop absolute and relative indicators, which should be applied in management accounting for assessment and analysis of economic, social and environmental sustainability.

Partial milking of cattle in smallholder herds on the Accra Plains: some factors affecting daily partial milk yield and milk composition

1992 ◽  
Vol 54 (1) ◽  
pp. 15-21 ◽  
Author(s):  
S. A. Okantah
Keyword(s):  
Milk Yield ◽  
Milk Composition ◽  
Dry Season ◽  
Sub Saharan Africa ◽  
Factors Affecting ◽  
Stage Of Lactation ◽  
Lactation Length ◽  
Sub Saharan ◽  
Quadratic Effects ◽  
Accra Plains

AbstractDaily partial milk yield of Sanga cows in 13 smallholder agropastoralist herds at two locations on the Accra Plains was recorded through monthly sampling. Estimates of mean daily partial milk yield and milk composition were computed from 1266 observations. The unadjusted mean daily partial milk yield was 875 (s.e. 11) g. The composition of milk: total solids (TS), fat (F) and solid-not-fat (SNF) were 131 (s.e. 14), 41 (s.e. 11) and 90 (s.e. 7) g/kg respectively. Least squares estimate of mean daily partial milk yield were 808·2 and 462·4 g with average s.e. of 41·8 for wet and dry season respectively. The wet and dry season differences in daily partial milk yield, TS and F were highly significant (P < 0·01). Seasonal difference in SNF was not significant.Herd difference in partial milk yield, TS, F and SNF were highly significant (P < 0·02). There were no significant effects of location on daily partial milk yield and SNF, although location effects on F and TS were significant (P < 0·05). The highest milk yield was observed in cows in third lactation and the lowest in cows in seventh lactation (P < 0·01). Daily partial milk yield peaked in the 3rd month of lactation. On average, lactation length was 210 to 240 days. Both linear and quadratic effects of stage of lactation were highly significant (P < 0·01). Lactation curve parameters for partially milked cows were also estimated. The implications of the results for milk production in sub-Saharan Africa were discussed.

Openness and the Politics of Potable Water

2011 ◽  
Vol 44 (6) ◽  
pp. 771-803 ◽  
Author(s):  
Nita Rudra
Keyword(s):  
Developing Countries ◽  
Potable Water ◽  
Driving Forces ◽  
Developing Nations ◽  
National Study ◽  
Factors Affecting ◽  
Poor Countries ◽  
Large N ◽  
Cross National Study ◽  
Cross National

Improving access to potable water has become an increasingly urgent concern for developing nations in the current era of globalization. According to standard wisdom, if developing countries undertake certain domestic reforms, such as investing in infrastructure and engineering, then safe and clean drinking water will improve. This analysis uncovers, however, that in addition to such domestic efforts, one of the greatest factors affecting water uncertainty is, in fact, internationally induced: trade. Surprisingly, both scholars and practitioners have neglected the potential impacts of expanding trade on access to potable water. This analysis is the first large- N cross-national study of water that focuses on the interplay of trade and politics—both international and domestic—as the primary driving forces behind improvements in (or constraints to) water access. The author hypothesizes that growing export pressures are constraining drinkable water in poor countries, but a particular domestic condition can mitigate this effect: the existence of lower levels of income inequality. As the socioeconomic actors disadvantaged by openness, particularly in more equal countries, seek reparations for the growing threats to potable water, the adverse affects of trade on water may be averted. Empirical evidence from 77 developing countries and case studies of Vietnam and India provide support for this hypothesis.

Response ofCarex cinerascenspopulations to groundwater level gradients in the Poyang Lake wetland

2016 ◽  
Vol 36 (16) ◽  
Author(s):  
冯文娟 FENG Wenjuan ◽  
徐力刚 XU Ligang ◽  
王晓龙 WANG Xiaolong ◽  
李海英 LI Haiying ◽  
姜加虎 JIANG Jiahu
Keyword(s):  
Groundwater Level ◽  
Poyang Lake ◽  
Poyang Lake Wetland
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