scholarly journals Study on the Construction of Landscape Ecological Classification System for Large-Scale Coal-Power Base in Semi-Arid Steppe Region

2018 ◽  
Author(s):  
Zhenhua Wu ◽  
Shaogang Lei ◽  
Zhengfu Bian
Keyword(s):  
Landscape Ecology ◽  
Large Scale ◽  
Ecological Classification ◽  
Steppe Region ◽  
Power Base ◽  
Arid Steppe ◽  
Coal Power ◽  
And Function ◽  
Landscape Ecological ◽  
Semi Arid

The ecological background condition of the semi-arid steppe region (SASR) is extremely fragile. It is recognized that the development of coal and electricity power is a kind of strong human interference behavior for regional landscape ecology. Landscape ecological classification (LEC) is the premise of landscape ecology research of the mining area. The current research on the SASR and grassland LEC of coal-power base is relatively less, but still remains uncertainty concerning how to stratify and classify urban mining landscapes into units of ecological significance at spatial scales appropriate for management. This study is based on hierarchy theory, scale theory, landscape process, the patch-corridor-matrix model, the network, the theory of multiple planning integration and the principle of remote sensing. According to the comprehensive principle, principles of the combining of structure and function, principle of the combining human-ominated and natural landscape, principle of emphasis, and principle of combining qualitative analysis with quantitative research of LEC in large-scale coal-power base(LSCPB). On the basis of occurrence method land classification, fully consider the ecological attributes of the land, integration pattern, processes and function theory of the landscape ecology, the LEC system of the LSCPB in the SASR has been constructed by using top-down decomposition classification method. Empirical research of the Victory and Mindong No.1 mining areas of Shenhua Group shows that the classification system constructed in this paper can meet the requirements of LEC and fully reflect the status of landscape ecology of LSCPB in SASR. This study can provide theoretical guidance for the landscape ecology of LSCPB, while also supporting a theoretical reference for the LEC research.

scholarly journals Is shrub-encroached grassland a stable state in the semi-arid steppe region?

2020 ◽  
Author(s):  
Guang Hao ◽  
Nan Yang ◽  
Ke Dong ◽  
YuJuan Xu ◽  
Xinfeng Ding ◽  
...  
Keyword(s):  
Stable State ◽  
Steppe Region ◽  
Arid Steppe ◽  
Semi Arid

scholarly journals Impacts of Large-Scale Open-Pit Coal Base on the Landscape Ecological Health of Semi-Arid Grasslands

2019 ◽  
Vol 11 (15) ◽  
pp. 1820 ◽  
Author(s):  
Zhenhua Wu ◽  
Shaogang Lei ◽  
Qingqing Lu ◽  
Zhengfu Bian
Keyword(s):  
Large Scale ◽  
Landscape Planning ◽  
Open Pit ◽  
Ecological Health ◽  
Gradual Decline ◽  
Temporal And Spatial ◽  
Arid Grasslands ◽  
Landscape Ecological ◽  
The Impact ◽  
Semi Arid

Coal is an important energy resource in the world, especially in China. Extensive coal exploitation seriously damaged the grassland and its fragile ecosystem. However, temporal and spatial impact laws of open-pit coal exploitation on Landscape Ecological Health (LEH) of semi-arid grasslands are still not clear. Therefore, the main objective of this paper is to study impact of Large-scale Open-pit Coal Base (LOCB) on the LEH of semi-arid grasslands from the perspectives of temporal and spatial. Taking Shengli LOCB of Xilinguole grassland in Inner Mongolia as an example, we demonstrate a conceptual model of LOCB impact on LEH of semi-arid grasslands, and establish a research system called landscape Index-pattern Evolution-Driving force-Spatial statistics (IEDS). A complete process integrated from investigation, monitoring, and evaluation to the analysis of impact laws was developed. Result indicated that coal mining causes gradual increase of landscape patches, landscape fragmentation, gradual decline of landscape connectivity, complexity and irregularity of landscape shape, enhancement of landscape heterogeneity and complexity, gradual decline of landscape stability, gradual decrease of grassland landscape and annual increase of unhealthy grassland landscape. The LEH of grassland basically belongs to the state of slight deterioration. In the past 15 years, the spatial and temporal distribution characteristics of LEH in the study area are similar. This study provides scientific reference for ecological disturbance research, environmental protection, landscape planning, restoration and renovation of ecological environment in mining areas. At the same time, future research should integrate geological, hydrological, soil, vegetation, microorganisms, animals, climate, and other perspectives to study the impact of mining on landscape ecology deeply.

scholarly journals Assessment of Landscape Ecological Health: A Case Study of a Mining City in a Semi-Arid Steppe

2019 ◽  
Vol 16 (5) ◽  
pp. 752 ◽  
Author(s):  
Zhenhua Wu ◽  
Shaogang Lei ◽  
Bao-Jie He ◽  
Zhengfu Bian ◽  
Yinghong Wang ◽  
...  
Keyword(s):  
Ecological Integrity ◽  
Health Assessment ◽  
Ecological Status ◽  
Ecological Health ◽  
Assessment Index ◽  
Mining Areas ◽  
Mining City ◽  
Arid Steppe ◽  
Landscape Ecological ◽  
Semi Arid

The ecological status of the semi-arid steppes in China is fragile. Under the long-term and high-intensity development of mining, the ecological integrity and biodiversity of steppe landscapes have been destroyed, causing soil pollution, grassland degradation, landscape function defect, and so on. Previous studies have mainly focused on ecosystem health assessment in mining areas. Landscape ecological health (LEH) pays more attention to the interactions between different ecosystems. Therefore, the ecological assessment of mining cities is more suitable on a landscape scale. Meanwhile, the existing LEH assessment index systems are not applicable in ecologically fragile areas with sparse population, underdeveloped economy, and in relatively small research areas. The purpose of this study was to construct a LEH assessment index system and evaluate the LEH of a mining city located in a semi-arid steppe. Xilinhot is a typical semi-arid steppe mining city in China. The contradictions between the human, land and ecological environment are serious. A new model Condition, Vigor, Organization, Resilience, and Ecosystem (CVORE) model was constructed that integrated five subsystems (services) from the perspectives of ecology, landscape ecology, mining science, and geography. This study used the CVORE model to systematically evaluate the LEH in Xilinhot city in terms of five LEH levels, including very healthy, healthy, sub-healthy, unhealthy and morbid landscape. Research results show that the areas of the very healthy, healthy, sub-healthy, unhealthy and morbid landscapes are 13.23, 736.35, 184.5, 66.76 and 20.63 km2, respectively. The healthy landscapes area accounts for 72.08% and most grasslands are healthy. The sub-healthy landscapes are mainly located around areas with higher disturbances due to human activities. The morbid or unhealthy landscapes are concentrated in the mining areas. The proposed CVORE model can enrich the foundations for the quantitative assessment of Landscape Ecological Health of Mining Cities in Semi-arid Steppe (LEHMCSS). This study provided a new LEH assessment approach (CVORE model), which can support landscape ecological restoration, ecological environmental protection and urban planning of the semi-arid steppe mining cities.

scholarly journals Time-Spatial Contextuality, Complexity, and Integrity of the Development and Cognition of Landscape Ecology (Selected Theoretical and Meta-Scientific Aspects)

2016 ◽  
Vol 9 (3) ◽  
pp. 14-32
Author(s):  
Florin Žigrai
Keyword(s):  
Landscape Ecology ◽  
Scientific Research ◽  
Research Field ◽  
Ecological Research ◽  
Social Nature ◽  
Potential Development ◽  
Points Of View ◽  
And Function ◽  
Landscape Ecological

Abstract The view of the development and cognition of landscape ecology should not be an isolated one. In order to comprehend the connection, complexity and cohesion of natural and social nature which influence the genesis, development and function of landscape ecology should be studied in time-spatial and landscape-ecological contextuality, complexity and integrity. This paper is devoted to the topic of time-spatial contextuality, complexity, and integrity of landscape ecology as a science approached from two points of view: firstly, the potential development of landscape ecology reflecting its object and approach of research and secondly, cognition of landscape ecology by landscape ecologists, i.e. subject of landscape ecological research. The mission of this paper is to at least partially enlighten so far less studied meta-scientific research field by means of selected theoretical and meta-scientific aspects.

Study of the desertification index based on the albedo-MSAVI feature space for semi-arid steppe region

2019 ◽  
Vol 78 (6) ◽  
Author(s):  
Zhenhua Wu ◽  
Shaogang Lei ◽  
Zhengfu Bian ◽  
Jiu Huang ◽  
Yong Zhang
Keyword(s):  
Feature Space ◽  
Steppe Region ◽  
Arid Steppe ◽  
Semi Arid

Vegetation succession prevents dry lake beds from becoming dust sources in the semi-arid steppe region of China

2010 ◽  
Vol 36 (7) ◽  
pp. 864-871 ◽  
Author(s):  
Fengjun Zhao ◽  
Hongyan Liu ◽  
Yi Yin ◽  
Guozheng Hu ◽  
Xiuchen Wu
Keyword(s):  
Vegetation Succession ◽  
Steppe Region ◽  
Dust Sources ◽  
Dry Lake ◽  
Arid Steppe ◽  
Semi Arid ◽  
Lake Beds

Plant hormones, plant growth regulators

2014 ◽  
Vol 155 (26) ◽  
pp. 1011-1018 ◽  
Author(s):  
György Végvári ◽  
Edina Vidéki
Keyword(s):  
Nervous System ◽  
Growth And Development ◽  
Large Scale ◽  
Essential Role ◽  
Higher Plants ◽  
Structure And Function ◽  
Wide Sense ◽  
Large Scale Integration ◽  
Scale Integration ◽  
And Function

Plants seem to be rather defenceless, they are unable to do motion, have no nervous system or immune system unlike animals. Besides this, plants do have hormones, though these substances are produced not in glands. In view of their complexity they lagged behind animals, however, plant organisms show large scale integration in their structure and function. In higher plants, such as in animals, the intercellular communication is fulfilled through chemical messengers. These specific compounds in plants are called phytohormones, or in a wide sense, bioregulators. Even a small quantity of these endogenous organic compounds are able to regulate the operation, growth and development of higher plants, and keep the connection between cells, tissues and synergy beween organs. Since they do not have nervous and immume systems, phytohormones play essential role in plants’ life. Orv. Hetil., 2014, 155(26), 1011–1018.

Effects of defoliation timing on plant nutrient resorption and hay production in a semi-arid steppe

2020 ◽  
Author(s):  
Tongrui Zhang ◽  
Frank Yonghong Li ◽  
Hao Wang ◽  
Lin Wu ◽  
Chunjun Shi ◽  
...  
Keyword(s):  
Nutrient Cycling ◽  
Nutrient Resorption ◽  
Plant Production ◽  
Conservation Strategy ◽  
Plant Nutrient ◽  
Resorption Efficiency ◽  
Nutrient Return ◽  
Peak Biomass ◽  
Arid Steppe ◽  
Semi Arid

Abstract Aims Nutrient resorption is a key plant nutrient conservation strategy, and its response to environmental and management changes is linked to nutrient cycling and production of ecosystems. Defoliation is a major pathway of mowing affecting plant nutrient resorption and production in grasslands, while the effect of defoliation timing has not been unexplored. The aim of this study was to examine the effect of defoliation timing on plant nutrient resorption and production in a steppe ecosystem. Methods We conducted a field experiment in a semi-arid steppe of Inner Mongolia including four treatments: early defoliation, peak defoliation, late defoliation and non-defoliation. We measured plant nitrogen (N) and phosphorus (P) resorption at species and community levels, and quantified plant N and P fluxes in resorption, litter return and hay output. Plant production in the mowing system was assessed by hay production and quality. Important Findings Peak and late defoliation, but not early defoliation, reduced plant community N and P resorption proficiency (RP); and late defoliation reduced N resorption efficiency (RE) but not P resorption efficiency. Peak and late defoliation, but not early defoliation, reduced plant nutrient resorption flux and litter nutrient return flux. Defoliation timing did not alter root nutrient accumulation as nutrient uptake from soil likely compensated the deficit of nutrient resorption. Peak defoliation had the highest hay production and quality, while early defoliation had the lowest. Our results provide new insights into the nutrient cycling in mowing grassland, and imply that the mowing timing can be used as a tool to mediate the balance between conservation and production of steppes, and the early mowing before plant peak biomass period is recommended for conservation of the steppes while keeping sustainable pastoral production.

Functional design of glycan-conjugated molecules using a chemoenzymatic approach

2021 ◽  
Author(s):  
Makoto Ogata
Keyword(s):  
Molecular Weight ◽  
Large Scale ◽  
Biological Activities ◽  
Natural Compounds ◽  
Low Molecular Weight ◽  
Functional Design ◽  
Enzymatic Method ◽  
Conjugated Molecules ◽  
Design Synthesis ◽  
And Function

Abstract Carbohydrates play important and diverse roles in the fundamental processes of life. We have established a method for accurately and a large scale synthesis of functional carbohydrates with diverse properties using a unique enzymatic method. Furthermore, various artificial glycan-conjugated molecules have been developed by adding these synthetic carbohydrates to macromolecules and to middle and low molecular weight molecules with different properties. These glycan-conjugated molecules have biological activities comparable to or higher than those of natural compounds, and present unique functions. In this review, several synthetic glycan-conjugated molecules are taken as examples to show design, synthesis and function.

Sign in / Sign up

Export Citation Format

Share Document