scholarly journals Influence of Drought Stress and Rehydration on Moisture and Photosynthetic Physiological Changes in Three Epilithic Moss Species in Areas of Karst Rocky Desertification

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Chunlei Cong ◽  
Tianlei Liu ◽  
Xianqiang Zhang
Keyword(s):  
Drought Stress ◽  
Water Content ◽  
Control Level ◽  
Free Water ◽  
Physiological Adaptation ◽  
Karst Area ◽  
Karst Rocky Desertification ◽  
Rocky Desertification ◽  
Water Saturation Deficit ◽  
Moss Species

The drought resistance mechanism of typical mosses in the karst area was studied, and the water and photosynthetic physiological adaptation of mosses to karst environmental change was analyzed in this paper, which provided the basis for the restoration and control of karst rocky desertification ecological environment. Three superior plants in the rocky desertification area of Guizhou province were selected; they are, respectively, Erythrodontium julaceum (Schwaegr.) Par., Barbula unguiculata Hedw., and Bryum argenteum Hedw. Results show that the three kinds of plant rock mosses of leaf water potential (Ψs), free water content ( V a ), total water content, and relative water content (RWC) decreased; bound water ( V s ), water saturation deficit (WSD), and V s / V a ratio increased; transpiration rate (Tr) fell slightly, under drought stress. The physiological indexes of water have different degrees of recovery after rehydration. The total chlorophyll content shows a trend of first increasing followed by falling and then rising. RWC was negatively related to qN and positively related to F v / F m , yield, ETR, and qP. After rewetting, the fluorescence parameters are returned to average level under mild-to-moderate stress. At the same time, it is hard to get back to the control level under severe pressure. The water use efficiency (WUE) decreased with stress and recovered to different degrees after rehydration.

Adaptability of Cornus Alba Seedling under Drought Stress in Highway Greening

2011 ◽  
Vol 90-93 ◽  
pp. 3262-3267
Author(s):  
Wen Yuan Xu ◽  
Long Sun ◽  
Li Qiang Mu
Keyword(s):  
Drought Stress ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Drought Resistance ◽  
Control Method ◽  
Water Saturation ◽  
Focal Point ◽  
Water Saturation Deficit ◽  
Cornus Alba

The drought resistance adaptation mechanism of highway greening plants was always the focal point which the researcher payed attention. This experiment took Cornus alba as the study object and examines its resistance to drought stress by using the potting and water control method. The researcher measured bond water content, water saturation deficit, relevant water content, relevant content of osmotic water, and osmotic potential when full turgor and turgor were both zero. Other water condition indexes also were analyzed systematically. Finally, a comprehensive evaluation on the drought resistance of Cornus alba by fuzzy mathematics’ anti-membership function was conducted. According to the experiment result, Cornus alba had the highest drought resistance at B-level treatment (soil water content: 53.60%), followed by D-level (soil water content: 29.90%) treatment. Cornus alba had strong endurance and resistance to drought stress. This study could provide a scientific basis for the future introduction of other urban greenbelt plants and the choice of excellent traits.

scholarly journals STUDY ON KARST INFORMATION IDENTIFICATION OF QIANDONGNAN PREFECTURE BASED ON RS AND GIS TECHNOLOGY

2018 ◽  
Vol XLII-3 ◽  
pp. 2121-2125
Author(s):  
M. Yao ◽  
G. Zhou ◽  
W. Wang ◽  
Z. Wu ◽  
Y. Huang ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Karst Area ◽  
Karst Region ◽  
Karst Collapse ◽  
Distribution Map ◽  
Visual Interpretation ◽  
Remote Sensing Images ◽  
Karst Rocky Desertification ◽  
Rocky Desertification ◽  
Karst Areas

Karst area is a pure natural resource base, at the same time, due to the special geological environment; there are droughts and floods alternating with frequent karst collapse, rocky desertification and other resource and environment problems, which seriously restrict the sustainable economic and social development in karst areas. Therefore, this paper identifies and studies the karst, and clarifies the distribution of karst. Provide basic data for the rational development of resources in the karst region and the governance of desertification. Due to the uniqueness of the karst landscape, it can’t be directly recognized and extracted by computer in remote sensing images. Therefore, this paper uses the idea of “RS + DEM” to solve the above problems. this article is based on Landsat-5 TM imagery in 2010 and DEM data, proposes the methods to identify karst information research what is use of slope vector diagram, vegetation distribution map, distribution map of karst rocky desertification and other auxiliary data in combination with the signs for human-computer interaction interpretation, identification and extraction of peak forest, peaks cluster and isolated peaks, and further extraction of karst depression. Experiments show that this method achieves the “RS + DEM” mode through the reasonable combination of remote sensing images and DEM data. It not only effectively extracts karst areas covered with vegetation, but also quickly and accurately locks down the karst area and greatly improves the efficiency and precision of visual interpretation. The accurate interpretation rate of karst information in study area in this paper is 86.73 %.

Relationship between karst rocky desertification and its distance to roadways in a typical karst area of Southwest China

2012 ◽  
Vol 70 (1) ◽  
pp. 295-302 ◽  
Author(s):  
Qiyong Yang ◽  
Zhongcheng Jiang ◽  
Zulu Ma ◽  
Weiqun Luo ◽  
Yunqiu Xie ◽  
...  
Keyword(s):  
Southwest China ◽  
Karst Area ◽  
Karst Rocky Desertification ◽  
Rocky Desertification

The relations between land use and karst rocky desertification in a typical karst area, China

2008 ◽  
Vol 57 (3) ◽  
pp. 621-627 ◽  
Author(s):  
Yang-bing Li ◽  
Jing-an Shao ◽  
Hua Yang ◽  
Xiong-yong Bai
Keyword(s):  
Land Use ◽  
Karst Area ◽  
Karst Rocky Desertification ◽  
Rocky Desertification

scholarly journals Crops planting structure and karst rocky desertification analysis by Sentinel-1 data

2021 ◽  
Vol 13 (1) ◽  
pp. 867-879
Author(s):  
Lingyu Wang ◽  
Quan Chen ◽  
Zhongfa Zhou ◽  
Xin Zhao ◽  
Jiancheng Luo ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Time Series ◽  
Arable Land ◽  
Strong Support ◽  
Karst Area ◽  
Good Effect ◽  
Mountainous Areas ◽  
Karst Rocky Desertification ◽  
Rocky Desertification ◽  
Spatial Coupling

Abstract Accurate crop planting structure (CPS) information and its relationship with the surrounding special environment can provide strong support for the adjustment of agricultural structure in areas with limited cultivated land resources, and it will help regional food security, social economy, and ecological balance adjustment. However, due to the perennial cloudy, rainy, and scattered arable land in Karst mountainous areas, the monitoring of planting structure by traditional remote sensing methods is greatly limited. In this regard, we focus on synthetic aperture radar (SAR) remote sensing, which can penetrate clouds and rain, without light constraints to image. In this article, based on parcel-based temporal sequence SAR, the CPS in South China karst area was extracted by deep learning technology, and the spatial coupling relationship between CPS and karst rocky desertification (KRD) was analyzed. The results showed that: (a) The overall accuracy of CPS classification was 75.98%, which proved that the geo-parcel-based time series SAR has a good effect for the CPS mapping in the karst mountainous areas; (b) Through the analysis of the spatial relationship between the planting structure and KRD, we found that the lower KRD level caused the simpler CPS and the higher KRD grade caused more complex CPS and more richer landscape types. The spatial variation trend of CPS landscape indicates the process of water shortage and the deepening of KRD in farmland; (c) The landscape has higher connectivity (Contagion Index, CI 0.52–1.73) in lower KRD level and lower connectivity (CI 0.83–2.05) in higher KRD level, which shows that the degree of fragmentation and connection of CPS landscape is positively proportional to the degree of KRD. In this study, the planting structure extraction of crops under complex imaging environment was realized by using the farmland geo-parcels-based time series Sentinel-1 data, and the relationship between planting structure and KRD was analyzed. This study provides a new idea and method for the extraction of agricultural planting structure in the cloudy and rainy karst mountainous areas of Southwest China. The results of this study have certain guiding significance for the adjustment of regional agricultural planting structure and the balance of regional development.

scholarly journals Bryophytes and the symbiotic microorganisms, the pioneers of vegetation restoration in karst rocky desertification areas in southwestern China

2019 ◽  
Vol 104 (2) ◽  
pp. 873-891 ◽  
Author(s):  
Wei Cao ◽  
Yuanxin Xiong ◽  
Degang Zhao ◽  
Hongying Tan ◽  
Jiaojiao Qu
Keyword(s):  
Microbial Communities ◽  
Function Analysis ◽  
Guizhou Province ◽  
Karst Rocky Desertification ◽  
Rocky Desertification ◽  
Moss Species ◽  
Drought Resistant ◽  
Bacteria And Fungi ◽  
Microbial Groups ◽  
Degraded Ecosystems

AbstractIn karst rocky desertification areas, bryophytes coexist with algae, bacteria, and fungi on exposed calcareous rocks to form a bryophyte crust, which plays an irreplaceable role in the restoration of karst degraded ecosystems. We investigated the biodiversity of crust bryophytes in karst rocky desertification areas from Guizhou Province, China. A total of 145 species in 22 families and 56 genera were identified. According to frequency and coverage, seven candidate dominant mosses were screened out, and five drought-resistant indexes of them were measured. Hypnum leptothallum, Racopilum cuspidigerum, and Hyophila involuta have high drought adaptability. We explored the interactions between two dominant mosses (H. leptothallum, H. involuta) and the structure of microbial communities in three karst rocky desertification types. Microbial diversity and function analysis showed that both moss species and karst rocky desertification types affect microbial communities. Moss species much more strongly affected the diversity and changed the community composition of these microbial groups. Bacteria were more sensitive in the microbiome as their communities changed strongly between mosses and drought resistance factors. Moreover, several species of fungi and bacteria could be significantly associated with three drought-resistant indexes: Pro (free proline content), SOD (superoxide dismutase activity), and POD (peroxidase activity), which were closely related to the drought adaptability of mosses. Our results enforced the potential role of moss-associated microbes that are important components involved in the related biological processes when bryophytes adapted to arid habitats, or as one kind of promoters in the distribution pattern of early mosses succession in karst rocky desertification areas.

Response of landscape pattern of karst rocky desertification to land-use change in a typical karst area

2018 ◽  
Vol 38 (24) ◽  
Author(s):  
冉晨 RAN Chen ◽  
白晓永 BAI Xiaoyong ◽  
谭秋 TAN Qiu ◽  
罗旭玲 LUO Xuling ◽  
陈欢 CHEN Huan ◽  
...  
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Landscape Pattern ◽  
Karst Area ◽  
Karst Rocky Desertification ◽  
Rocky Desertification

scholarly journals KARST ROCKY DESERTIFICATION ANALYSIS BASED ON HISTORICAL DISP DATA TAKE TWO REGIONS FOR EXAMPLE

2020 ◽  
Vol XLII-3/W10 ◽  
pp. 871-874
Author(s):  
J. Liu ◽  
G. Q. Zhou ◽  
B. Jia ◽  
T. Yue ◽  
X. Y. Peng
Keyword(s):  
Southwest China ◽  
Temporal Evolution ◽  
Driving Forces ◽  
The United States ◽  
Living Environment ◽  
Karst Area ◽  
Visual Interpretation ◽  
Karst Rocky Desertification ◽  
Rocky Desertification ◽  
Hydrogeological Data

Abstract. Karst rocky desertification (KRD) is used to characterize the processes that transform a karst area covered by vegetation and soil into a rocky landscape almost devoid of soil and vegetation. This situation seriously affects and threatens the living environment and standards of local people, which results in a series of social problems. In view of the importance and harmfulness of KRD, many scholars have studied the spatial and temporal evolution of KRD and its driving forces. In this paper, the Visual Interpretation Marks of Rocky Desertification in Southwest China in 1960s are constructed by using the DISP image of the United States, combined with DEM data and Hydrogeological data. The area of rocky desertification in Guangnan and Funing counties, where rocky desertification is more serious, is about 2457.729 km2. The area of rocky desertification can be used as the basic data for studying the historical changes in southwestern China by researchers.

scholarly journals Water exchange parameters of lettuce plants under the action of cadmium ions

2018 ◽  
Vol 76 (2) ◽  
pp. 20-25
Author(s):  
I. Khomenk ◽  
O. Kosyk ◽  
N. Taran
Keyword(s):  
Water Content ◽  
Water Deficit ◽  
Water Exchange ◽  
Stomatal Density ◽  
Control Level ◽  
Free Water ◽  
Tolerance Index ◽  
Cadmium Ions ◽  
Free Water Content ◽  
Exchange Parameters

According to the purpose of the work, the effect of cadmium ions on the water exchange parameters in green Lolo and red Lolo Ross varieties of Lactuca sativa L. was investigated. In the experiment one-month plants grown on the medium where 0.1 mM cadmium was added in the sulfate form for fourteen days were used. The investigated parameters included: water deficit index, relative turgescence, free water content, cellular juice concentration, stomatal density and condition, and tolerance index. The weighable, refractometric, microscopic and analytical methods of research were used during the investigation Due to the results, the various plant response to the cadmium ions action in these lettuce varieties was revealed. In particular, the water deficit growth, reduction of the relative turgescence parameter, the free water content and concentration of cellular juice compared with the control level during the exposure was recorded in the green Lolo variety. Whereas, the water deficit decrease, an increase in the parameters of relative turgescence and free water content to the fourteenth day of exposure was noted for the red Lolo Ross variety. And also the absence of a reliable difference in the parameter of the concentration of cell juice. In addition, in both varieties, there was an increase in xeromorphism of the leaf blades, and in particular the stomata density. But in Lolo variety, most were locked in, unlike the Ross variety. According to the characteristics of the water exchange and stomatal analysis, it can be argued about the higher adaptive capacities of the Lolo Ross variety to this stress factor, compared with the Lolo variety.

scholarly journals EXTRACTION OF ROCKY DESERTIFICATION FROM DISP IMAGERY: A CASE STUDY OF LIUPANSHUI, GUIZHOU, CHINA

2017 ◽  
Vol XLII-2/W7 ◽  
pp. 1061-1065
Author(s):  
G. Zhou ◽  
Z. Wu ◽  
W. Wang ◽  
Y. Shi ◽  
G. Mao ◽  
...  
Keyword(s):  
Guizhou Province ◽  
Karst Area ◽  
Visual Interpretation ◽  
Karst Rocky Desertification ◽  
Rocky Desertification ◽  
Correction Model ◽  
Ground Control Points ◽  
Proposed Model ◽  
Typical Type

Karst rocky desertification is a typical type of land degradation in Guizhou Province, China. It causes great ecological and economical implications to the local people. This paper utilized the declassified intelligence satellite photography (DISP) of 1960s to extract the karst rocky desertification area to analyze the early situation of karst rocky desertification in Liupanshui, Guizhou, China. Due to the lack of ground control points and parameters of the satellite, a polynomial orthographic correction model with considering altitude difference correction is proposed for orthorectification of DISP imagery. With the proposed model, the 96 DISP images from four missions are orthorectified. The images are assembled into a seamless image map of the karst area of Guizhou, China. The assembled image map is produced to thematic map of karst rocky desertification by visual interpretation in Liupanshui city. With the assembled image map, extraction of rocky desertification is conducted.

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