The mechanisms of nutrient output through water flow from sloping farmland with slight rocky desertification in a karst region

The domestic and foreign evaluations of ecosystem service value are difficult to draw on results accepted by the public and academia. This reflects the research methods are still not mature, need to continue to be improved. In this paper, an attempt has been made to give urban unit value of ecosystem services and set up the values per unit area in southwestern Guizhou of China, in accordance with unit value of global ecosystem services developed by Costanza, et al., Chinese one by Xie, et al. and the actual situation of karst region. The analysis revealed that in the study area, the total ecosystem service value is $1.876×109 in 2006, equivalent to 104.3% of 2006 GDP (Gross Domestic Product), $1.799×109（1US$=7.8136，2006）. If the rocks change into forest in the study area, ecosystem service value will add $0.221×109, equivalent to 12.28% of GDP in 2006. Therefore, we conclude that the ecosystem services value is higher, compared to the local economy. In addition, the rocky desertification area is larger, and has already seriously influenced ecosystem service function. The tasks of ecological environment protection, propaganda and education in this region are of great significance.

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Tracing water flow from sloping farmland to streams using oxygen-18 isotope to study a small agricultural catchment in southwest China

Soil and Tillage Research ◽

10.1016/j.still.2013.08.005 ◽

2013 ◽

Vol 134 ◽

pp. 180-194 ◽

Cited By ~ 16

Author(s):

Pei Zhao ◽

Xiangyu Tang ◽

Peng Zhao ◽

Chao Wang ◽

Jialiang Tang

Keyword(s):

Water Flow ◽

Southwest China ◽

Sloping Farmland

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

ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ◽

10.5194/isprs-archives-xlii-3-2121-2018 ◽

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&thinsp;+&thinsp;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&thinsp;+&thinsp;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&thinsp;%.

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Spatial heterogeneity of soil microbial biomass carbon, nitrogen, and phosphorus in sloping farmland in a karst region on the Yunnan-Guizhou Plateau

Acta Ecologica Sinica ◽

10.5846/stxb201108171204 ◽

2012 ◽

Vol 32 (7) ◽

pp. 2056-2065

Author(s):

张利青 ZHANG Liqing ◽

彭晚霞 PENG Wanxia ◽

宋同清 SONG Tongqing ◽

邹冬生 ZOU Dongsheng ◽

曾馥平 ZENG Fuping ◽

...

Keyword(s):

Microbial Biomass ◽

Spatial Heterogeneity ◽

Soil Microbial Biomass ◽

Microbial Biomass Carbon ◽

Karst Region ◽

Biomass Carbon ◽

Nitrogen And Phosphorus ◽

Soil Microbial ◽

Sloping Farmland ◽

Guizhou Plateau

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Dynamic Evolution of the Ecological Carrying Capacity of Poverty-Stricken Karst Counties Based on Ecological Footprints: A Case Study in Northwestern Guangxi, China

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph17030991 ◽

2020 ◽

Vol 17 (3) ◽

pp. 991

Author(s):

Shana Shi ◽

Baoqing Hu ◽

Yan Yan ◽

Xiaoqing Li ◽

Kaichun Zhou ◽

...

Keyword(s):

Carrying Capacity ◽

Poverty Rate ◽

Karst Area ◽

Karst Region ◽

Rocky Desertification ◽

Evolutionary Patterns ◽

The Sustainable Development ◽

Ecological Carrying Capacity ◽

The Status ◽

Poverty Levels

The karst area in northwestern Guangxi is poor, underdeveloped, and ecologically fragile. It is experiencing rocky desertification, which creates challenges that are more severe than those of other regional ecological environments. In this paper, the ecological footprint (EF) model is used to analyze the ecological carrying capacity (EC) in northwestern Guangxi from 1995 to 2015, and the differences in karst counties with different poverty levels are discussed. The results show that (1) since 1995, the EC of northwestern Guangxi has continued to decrease, the EF has continued to increase, the ecological deficit (ED) has been expanding, and the status of the region has been unsustainable for a long time. (2) The evolutionary patterns, EF and EC of karst counties with different poverty levels are different. The county with the lowest poverty rate has the fastest growth rate of the per capita EF. The county with the largest proportion of karst area has the lowest EC. (3) It is recommended that different types of counties take different measures, including strengthening ecological environment protection, carrying out rocky desertification control and ecological resettlement projects, and reducing energy consumption. This study can provide information for the sustainable development of the karst region and provide decision support for regional poverty alleviation.

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The Impact of Urbanization on Ecosystem Health in Typical Karst Areas: A Case Study of Liupanshui City, China

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph18010093 ◽

2020 ◽

Vol 18 (1) ◽

pp. 93

Author(s):

Yangling Zhao ◽

Rui Han ◽

Nan Cui ◽

Jingbiao Yang ◽

Luo Guo

Keyword(s):

Ecosystem Health ◽

Raw Materials ◽

Management Policy ◽

Karst Area ◽

Karst Region ◽

Rocky Desertification ◽

Rapid Urbanization ◽

Karst Areas ◽

Impact Of Urbanization ◽

The Impact

The karst region of Southwest China is one of the largest continuous karst areas in the world, and the ecosystem in the karst region is extremely fragile. The city of Liupanshui, a typical karst area in southwestern China, has provided the main energy and raw materials during China’s rapid urbanization in the past few decades. With the continuous deterioration of the environment in Liupanshui and from the viewpoint of sustainable development strategies, research on ecosystem health (ESH) and the assessments of correlations between urbanization and ESH plays an important role in regional sustainable eco-environmental development. Therefore, the impact of urbanization on the ecosystem health of the study area was discussed in this study using a series of remote sensing images and socio-economic data from 1990 to 2015. Studies showed that Liupanshui is undergoing rapid urbanization, and the growth of urbanized land reached a peak between 2010 and 2015. From 1990 to 2015, the level of ESH in Liupanshui trended downward and then increased. During 2000 to 2010, due to the policy of returning farmland to grassland and forestland, the substantial increase in woodland and grassland and the management policy of mining areas have caused a turn in ESH. Although the value of ecosystem health in 2010–2015 increased, the process of urbanization is rapid, so we should pay more attention to the trend in future ecosystem health changes. The findings revealed that urbanization significantly negatively affects the ecosystem health of Liupanshui, and mining has the greatest impact. Therefore, in future urban development, strengthening the management of resource extraction and the supervision of environmental protection, continuing to return farmland to grassland and forestry, and controlling rocky desertification can improve the health of the urban ecosystem in the study area.

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Comparing Methods of Rocky Desertification Monitoring at the Sub-pixel Scale in a Highly Heterogeneous Karst Region

10.20944/preprints201802.0169.v1 ◽

2018 ◽

Author(s):

Xiangkun Qi ◽

Chunhua Zhang ◽

Kelin Wang

Keyword(s):

Remote Sensing ◽

Anthropogenic Disturbances ◽

Spectral Mixture Analysis ◽

Karst Region ◽

Mixture Analysis ◽

Rocky Desertification ◽

Fractional Cover ◽

Rocky Outcrop ◽

Rocky Outcrops ◽

Spectral Mixture

Karst rocky desertification (KRD) is a process where strong anthropogenic disturbances and exposure of carbonate bedrock occurs in fragile karst ecosystems. The fractional cover of rocky outcrops is a key indicator and mechanistic driver of KRD and can be accurately assessed using remote sensing technology. Nevertheless, rugged karst terrain relief can cause shadow effects on satellite imagery and combine with high heterogeneity of karst landscapes to prevent fractional cover retrievals. In this study, we explored the feasibility of applying multispectral high spatial resolution ALOS imagery for fractional cover extraction of rocky outcrops. We selected the dimidiate pixel model (DPM), which has been applied in previous studies, and spectral mixture analysis (SMA; including simple endmember spectral mixture analysis (SESMA) and multiple endmember spectral mixture analysis (MESMA)) to explore the feasibility of using remote images for KRD monitoring and improve accuracy for estimating fractions. Results from MESMA achieved high overall accuracy (76.4%) in monitoring percentage of rocky outcrop fraction in the study area. SESMA appears to underestimate percentage of rocky outcrop likely because the development of KRD was driven by complex factors (soil erosion, dissolution and anthropogenic disturbances). This results in spectral reflectance of rocky outcrop being variable in different settings. Predicted exposed bedrock coverage using SESMA and MESMA was similar in sun-lit and shaded areas although predictions from SESMA were smaller than reference data. DPM underestimated the fractional cover of rocky outcrops on south-facing slopes and overestimated it in shaded areas. Furthermore, SESMA and MESMA effectively reduced topographic effects. We conclude that it is better to extract percentage of rocky outcrop using MESMA in the karst region of southwestern China. Remote sensing is emerging as a feasible method to extract surface condition information in heterogeneous and rugged landscapes.

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Effects of Plum Plantation Ages on Soil Organic Carbon Mineralization in The Karst Rocky Desertification Ecosystem of Southwest China

10.20944/preprints201911.0154.v1 ◽

2019 ◽

Author(s):

Hui Yang ◽

Biqin Mo ◽

Mengxia Zhou ◽

Tongbin Zhu ◽

Jianhua Cao

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Carbon Mineralization ◽

Terrestrial Ecosystem ◽

Karst Region ◽

Order Kinetic ◽

Karst Rocky Desertification ◽

Rocky Desertification ◽

Significant Difference ◽

Soc Mineralization

Soil organic carbon (SOC) mineralization is closely related to carbon source or sink of terrestrial ecosystem. Understanding soil organic carbon (SOC) mineralization under plum plantation is essential for improving our understanding of SOC responses to land-use change in karst rocky desertification ecosystem. In this study, 2-y, 5-y and 20-y plum plantations and adjacent woodland were sampled and a 90-day incubation experiment was conducted to investigate the effect of plum plantation with different years on SOC mineralization in subtropical China. Results showed that: (1) there was no significant difference in SOC content between different planting years, but there were significant differences in accumulative SOC mineralization (Ct) and potential SOC mineralization (C0); (2) the dynamics of the SOC mineralization was a good fit to a first-order kinetic model. Both C0 and Ct in calcareous soil of this study was several to ten folds lower than that in other soils, indicating that SOC in karst region has higher stability. (3) Correlation analysis revealed that both Ct and C0 was significantly correlated with soil calcium (Ca) and C/N, indicating the important role of Ca and C/N in SOC mineralization in karst rocky desertification area.

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