Soil fertility self-development under ecological restoration in the Zhuxi watershed in the red soil hilly region of China

Bai, Liyue; Chen, Zhiqiang; Chen, Zhibiao

doi:10.1007/s11629-014-3056-7

Cited by 15 publications

(9 citation statements)

References 21 publications

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“…Comparing the TREE contents in the red soil and the coarse red soil, we found that the red soil only 19.09 mg kg -1 less than the average of all five subtypes of soil, and the coarse red soil was much lower than the average. Considering that the coarse red soil was located in the region where soil erosion has occurred seriously in the study area [21], we can conclude that soil erosion is one of the main factors for REE migration.…”

Section: Resultsmentioning

confidence: 99%

“…The topography is shown in Fig 1. This region is affected strongly by its warm and humid subtropical monsoon climate (the mean precipitation is 1,730.4 mm yr -1 and the mean annual temperature is 18.3°C), and the dominant soil type is red soil formed from coarse-grained biotitic granite [21]. Historically, the Zhuxi watershed had good vegetation cover, but due to weakly regulated exploitation and high-intensity interference from human activity, soil erosion has become a serious problem in this area.…”

Section: Methodsmentioning

confidence: 99%

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Rare earth elements in paddy fields from eroded granite hilly land in a southern China watershed

Chen

et al. 2019

PLoS ONE

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There are large amounts of ion-adsorption rare earth resources in the granite red soil region of southern China, and exploitation of rare earth elements (REEs) has caused serious soil erosion and soil pollution in the area. In this study, the spatial variability of soil REEs in Zhuxi watershed, Changting County, southern China, was analyzed using a geostatistics method. The analysis produced several important results: (1) The content of total rare earth elements (TREEs) in the soil samples ranged from 56.04 to 951.76 mg kg−1, with a mean value of 255.34 mg kg−1, which was higher than the background value of soil in China. The REE variables showed strong positive Ce anomalies and strong negative Eu anomalies, with mean values of 2.26 and 0.44, respectively. (2) The contents of TREEs in five subtypes of the soils were different, but they had broadly similar curves of chondrite-normalized REE patterns, with steeper patterns from La to Eu and flatter patterns from Eu to Y. (3) The spatial variability of light rare earth elements (LREEs) was mainly affected by natural factors, but the spatial variabilities of heavy rare earth elements (HREEs) and TREEs were influenced by the combination of natural factors and anthropogenic factors. Soil erosion can contribute significantly to REE migration, especially for HREEs. (4) The distribution of TREEs showed that the high content of TREEs was in the lowland of the western watershed. By comparing the distributions of TREEs in paddy fields and hilly land, we found that the area with a high content of TREEs was greater in paddy fields than in hilly land, so we deduced that REEs migrate from hilly land to the paddy field and accumulate in the soil there.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Rare earth elements in paddy fields from eroded granite hilly land in a southern China watershed

Chen

et al. 2019

PLoS ONE

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“…This was mainly attributed to the complex topography and local ecological restoration measures. The study region was characterized by the complex physical geography, a typical valley basin, which might directly impact soil nutrient contents (Bai et al 2014). Contrary to that, the C 0 /(C 0 ?…”

Section: Spatial Variability In Soc and Tn Contentsmentioning

confidence: 99%

“…Long-term acquirements for fuelwood in underdeveloped areas have resulted in vegetation degradation, as well as other environmental issues, such as greenhouse effect and soil erosion (Heltberg et al 2000;Foell et al 2011;Wang et al 2012). In addition, anthropogenic activities in these areas have caused the degradation of terrestrial ecosystems (Bai et al 2014). In most cases, these anthropogenic activities have profound effects on soil properties, especially on soil organic carbon (SOC) and total nitrogen (TN) (Xin et al 2016;Zhang et al 2016;Yuan et al 2017;Wang et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Spatial variability of soil organic carbon and total nitrogen in the hilly red soil region of Southern China

Yao

Deng

et al. 2019

J. For. Res.

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To obtain accurate spatial distribution maps of soil organic carbon (SOC) and total nitrogen (TN) in the Hetian Town in Fujian Province, China, soil samples from three depths (0-20, 20-40, and 40-60 cm) at 59 sampling sites were sampled by using traditional analysis and geostatistical approach. The SOC and TN ranged from 2.26 to 47.54 g kg -1 , and from 0.28 to 2.71 g kg -1 , respectively. The coefficient of variation for SOC and TN was moderate at 49.02-55.87% for all depths. According to the nuggetto-sill ratio values, a moderate spatial dependence of SOC content and a strong spatial dependence of TN content were found in different soil depths, demonstrating that SOC content was affected by both extrinsic and intrinsic factors while TN content was mainly influenced by intrinsic factors. Indices of cross-validation, such as mean error, mean standardized error, were close to zero, indicating that ordinary kriging interpolation is a reliable method to predict the spatial distribution of SOC and TN in different soil depths. Interpolation using ordinary kriging indicated the spatial pattern of SOC and TN were characterized by higher in the periphery and lower in the middle. To improve the accuracy of spatial interpolation for soil properties, it is necessary and important to incorporate a probabilistic and machine learning methods in the future study.

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“…Date back to last century, catastrophe theory has been applied in a lake ecosystem to evaluate whether the introduction of more predatory fish could improve water conditions significantly [ 13 ]. A new framework has been set up using catastrophe theory, laboratory experiment, field work, and 3S (geographic information system, global positioning system, and remote sensing) to explore soil fertility self-development in the Zhuxi watershed of Changting County in the red soil hilly region of China [ 14 ]. Catastrophe theory also provided the conceptual framework for retrospective assessment of the impact of commercial grazing and soil water availability on the soil stability index (SSI), indicating that, the landscape became more susceptible to erosion events under multiple droughts and grazing [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Application of catastrophe theory in comprehensive ecological security assessment of plastic greenhouse soil contaminated by phthalate esters

Zhou

Chen

et al. 2018

PLoS ONE

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Large amount of phthalate esters (PAEs) used as plasticizers in polyvinyl chloride (PVC) products has caused ubiquitous contamination to the environment and potential ecology security risk all around the world, especially in places plastic films were indispensably utilized due to the widely proposing of facility agriculture in China. A case of PAEs contamination in four suburb areas of Nanjing was analyzed and discussed in this study. A new frame work has been put forward based on multi-criteria evaluation model and mathematical method of catastrophe theory, using farming work, laboratory determination and relevant environmental standards to measure the ecology security risk of PAEs in study areas. The factors were selected based on the availability of the data and the local conditions. The assessment model involves the contamination status of PAEs in soil and vegetables, the contamination effects of PAEs to human and soil organisms and the contamination source of PAEs from plastic films and other products in the four study facility agriculture areas. An evaluation system of the model was composed of thirteen mesosphere indicators and twenty-five underlying indicators including total PAEs concentration in soils, single PAE concentration in soils, total PAEs concentrations in roots, leafy, solanaceous and stem vegetables, PAE human risks, soil microbial counts, microorganism diversity indices, atmospheric deposition of PAEs, whether sewage wastewater irrigation, planting mode of the facility agriculture areas and climate condition of study areas. The modified evaluation system was used in the assessment of ecology security of the same place based on the data of 2012, and the results suggested that the ecology security indicators were reliable and were agree well with the practical situation of the study areas. The results could provide guidance for the application of health risk assessment of soil environment for the strong objectivity of catastrophe theory compared with other evaluation methods.

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Soil fertility self-development under ecological restoration in the Zhuxi watershed in the red soil hilly region of China

Cited by 15 publications

References 21 publications

Rare earth elements in paddy fields from eroded granite hilly land in a southern China watershed

Rare earth elements in paddy fields from eroded granite hilly land in a southern China watershed

Spatial variability of soil organic carbon and total nitrogen in the hilly red soil region of Southern China

Application of catastrophe theory in comprehensive ecological security assessment of plastic greenhouse soil contaminated by phthalate esters

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