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Fractal features of soil profiles under different land use patterns on the Loess Plateau, China

Journal of Arid Land 2014年第5期6卷 550-560页

作者： lie xiao Sha XUE GuoBin LIU Chao ZHANG State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationNorthwest A&F University Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources

Fractal theory is becoming an increasingly useful tool to describe soil structure dynamics for a better understanding of the performance of soil systems. Changes in land use patterns significantly affect soil physical, chemical and biological properties. However, limited information is available on the fractal characteristics of deep soil layers under different land use patterns. In this study, the fractal dimensions of particle size distribution（PSD） and micro-aggregates in the 0–500 cm soil profile and soil anti-erodibility in the 0–10 cm soil profile for 10 typical land use patterns were investigated in the Zhifanggou Watershed on the Loess Plateau, China. The 10 typical land use patterns were： slope cropland, two terraced croplands, check-dam cropland, woodland, two shrublands, orchard, artificial and natural grasslands. The results showed that the fractal dimensions of PSD and micro-aggregates were all significantly influenced by soil depths, land use patterns and their interaction. The plantations of shrubland, woodland and natural grassland increased the amount of larger micro-aggregates, and decreased the fractal dimensions of micro-aggregates in the 0–40 cm soil profile. And they also improved the aggregate state and aggregate degree and decreased dispersion rate in the 0–10 cm soil profile. The results indicated that fractal theory can be used to characterize soil structure under different land use patterns and fractal dimensions of micro-aggregates were more effective in this regard. The natural grassland may be the best choice for improving soil structure in the study area.

关键词： fractal dimension anti-erodibility soil profile land use pattern Loess Plateau

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Soil Microbial Community Composition During Natural Recovery in the Loess Plateau, China

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Journal of Integrative Agriculture 2013年第10期12卷 1872-1883页

作者： xiao lie LIU Guo-bin XUE Sha ZHANG Chao State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationNorthwest A&F University Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resource

This study aimed to determine the characteristics of soil microbial community composition and its relationship with soil chemical properties during natural recovery in the Loess *** soil microbial community composition was analyzed by comparing the soil microbial phospholipid fatty acids（PLFAs） of eight croplands abandoned for 1,3,5,10,13,15,20,and 30 yr in the Dunshan watershed,northern Loess Plateau,*** results showed that soil organic carbon,total nitrogen,soil microbial biomass carbon,and soil microbial biomass nitrogen significantly increased with the abandonment duration,whereas the metabolic quotient significantly *** Shannon richness and Shannon evenness of PLFAs significantly increased after 10 yr of ***-negative,Gram-positive,bacterial,fungal,and total PLFAs linearly increased with increased abandonment *** analysis showed that the abandonment duration was the most important environmental factor in determining the PLFA microbial community *** soil microbial PLFAs changed from anteiso-to iso-,unsaturated to saturated,and short-to long-chain during natural ***,in the Loess Plateau,cropland abandonment for natural recovery resulted in the increase of the soil microbial PLFA biomass and microbial PLFA species and changed the microbial from chemolithotrophic to a more heterotrophic community.

关键词： abandoned cropland microbial diversity phospholipid fatty acid(PLFA) redundancy analysis(RDA) Loess Plateau

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Effect of Different Vegetation Types on the Rhizosphere Soil Microbial Community Structure in the Loess Plateau of China

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Journal of Integrative Agriculture 2013年第11期12卷 2103-2113页

作者： ZHANG Chao LIU Guo-bin XUE Sha xiao lie State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F University Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources

The Loess Plateau in China is one of the most eroded areas in the world. Accordingly, vegetation restoration has been implemented in this area over the past two decades to remedy the soil degradation problem. Understanding the microbial community structure is essential for the sustainability of ecosystems and for the reclamation of degraded arable land. This study aimed to determine the effect of different vegetation types on microbial processes and community structure in rhizosphere soils in the Loess Plateau. The six vegetation types were as follows：two natural grassland （Artemisia capillaries and Heteropappus altaicus）, two artificial grassland （Astragalus adsurgens and Panicum virgatum）, and two artificial shrubland （Caragana korshinskii and Hippophae rhamnoides） species. The microbial community structure and functional diversity were examined by analyzing the phospholipid fatty acids （PLFAs） and community-level physiological profiles. The results showed that rhizosphere soil sampled from the H. altaicus and A. capillaries plots had the highest values of microbial biomass C, average well color development of carbon resources, Gram-negative （G-） bacterial PLFA, bacterial PLFA, total PLFA, Shannon richness, and Shannon evenness, as well as the lowest metabolic quotient. Soil sampled from the H. rhamnoides plots had the highest metabolic quotient and Gram-positive （G＋） bacterial PLFA, and soil sampled from the A. adsurgens and A. capillaries plots had the highest fungal PLFA and fungal：bacterial PLFA ratio. Correlation analysis indicated a signiifcant positive relationship among the microbial biomass C, G- bacterial PLFA, bacterial PLFA, and total PLFA. In conclusion, plant species under arid climatic conditions signiifcantly affected the microbial community structure in rhizosphere soil. Among the studied plants, natural grassland species generated the most favorable microbial conditions.

关键词： soil microbial biomass microbial community structure PLFA community-level physiological profiles,vegetation types

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The response of soil organic carbon to climate and soil texture in China

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Frontiers of Earth Science 2022年第4期16卷 835-845页

作者： Yi ZHANG Peng LI xiaojun LIU lie xiao Tanbao LI Dejun WANG State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area Xi’an University of TechnologyXi’an 710048China State Key Laboratory of National Forestry and Grassland Administration on Ecological Hydrology and Disaster Prevention in Arid Regions Xi’an 710048China Forestry College Jiangxi Agricultural UniversityNanchang 330045China Northwest Surveying Planning and Designing Institute of National Forestry and Grassland AdministrationXi’an 710048China

Soil organic carbon(SOC)plays an essential role in the carbon cycle and global warming mitigation,and it varies spatially in relation to other soil and environmental *** the national distributions and the impact mechanisms of SOC remain debated in ***,how soil texture and climate factors affect the SOC content and the regional differences in SOC content were explored by analyzing 7857 surface soil samples with different *** results showed that the SOC content in China,with a mean value of 11.20 g·kg^(-1),increased gradually from north to *** SOC content of arable land in each geographical area was lower than in grassland and *** temperature also played a specific role in the SOC content,precipitation was the most critical climate *** SOC content was positively correlated with the silt and clay *** lower the temperature,the greater the effect of environmental factors on *** contrast,the higher the temperature,the more significant impact of soil texture on *** regional difference in SOC highlights the importance of soil responses to climate ***-ture and soil texture should be explicitly considered when predicting potential future carbon cycle and sequestration.

关键词： soil organic carbon climate soil texture land use

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Kinetic Phase Transition in A_2+2B_2→2B_2A Reaction System with Particle Diffusion

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Communications in Theoretical Physics 2008年第4期49卷 960-964页

作者： HUA Da-Yin WENG xiao-Yan WANG lie-Yan CHEN Ting Physics Department Ningbo University Ningbo 315211 China

A lattice gas model is presented for the A2 ＋2B2 → 2B2A reaction system with particle diffusion in two dimensions. In the model, B2 dissociates in the random dimer-filling mechanism and A2 dissociates in the end-on dimer filling mechanism. A reactive window appears and the system exhibits a continuous phase transition from a reactive state to a ＂B ＋ vacancy＂ covered state with infinitely many absorbing states. When the diffusion of particle B is considered, there are only two absorbing states. It is found that the critical behavior of the continuous phase transition changes from the directed percolation （DP） class to the pair contact process with diffusion （PCPD） class.

关键词： non-equilibrium phase transition reaction diffusion system

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A new phenylethanoid glycoside from Isodon sculponeatus

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Chinese Chemical Letters 2011年第8期22卷 961-963页

作者： Li Mei Li Jian Xin Pu Wei lie xiao Han Dong Sun Scientific Research Center Chengdu Medical College Chengdu 610083 China State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China

A new phenylethanoid glycoside,seulponisidc（1） was isolated from the aerial parts of Isodon sculponeatus（Vaniot） Kudo, along with six known compounds martynoside（2）,verbascoside（3）,（＋）-hydroxypinoresinol-8-O- β-D-glucoside（4）,cedrusin（5）, 7-megastigmene-3S,5R,6R,7E,9S-tetrol（6） and 4-oxo- β-ionol- β-D-glucopyranoside（7）.Their chemical structures were elucidated from physieochemical data and by acidic hydrolysis.

关键词： Isodon sculponeatus(Vaniot) Kudo Labiatae Phenylethanoid glycoside Sculponiside

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A new lipophilic monosaccharide from Erigeron annuus

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Chinese Chemical Letters 2008年第10期19卷 1231-1233页

作者： Sheng Chao Yang Jian Xin Pu Ying Lu Feng Hui xiao Wei lie xiao Han Dong Sun Institute of Chinese Medicinal Materials of Yunnan Agricultural University and Yunnan Provincial Center of Chinese Medicinal Materials＇ GAP Technology Kunming 650201 China State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China

A new lipophilic monosaccharide, erigearide A （1）, was isolated from the aerial parts of Erigeron annuus （Lima.） Pers. Its structure was elucidated by analysis of spectroscopic evidence.

关键词： Erigeron annuus Lipophilic monosaccharide Erigearide A

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Solid lipid nanoparticles loading with curcumin and dexanabinol to treat major depressive disorder

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Neural Regeneration Research 2021年第3期16卷 537-542页

作者： xiao-lie He Li Yang Zhao-Jie Wang Rui-Qi Huang Rong-Rong Zhu Li-Ming Cheng Key Laboratory of Spine and Spinal Cord Injury Repair and Regeneration of Ministry of Education Department of OrthopedicsTongji HospitalSchool of Life Science and TechnologyTongji UniversityShanghaiChina

Dexanabinol(HU-211)is an artificially synthesized cannabinoid derivative that exerts neuroprotective effects through anti-inflammatory and antioxidant *** exhibits antidepressant effects in the treatment of major depressive *** investigate the antidepressant effects of solid lipid nanoparticles loaded with both curcumin and dexanabinol,and the underlying mechanisms associated with this combination,we established wild-type(CBR1~(+/+))and cannabinoid receptor 1(CBR1)knockout(CBR1~(–/–))mouse models of major depressive disorder,through the intraperitoneal injection of corticosterone,for 3 successive days,followed by treatment with intraperitoneal injections of solid lipid nanoparticles loading with curcumin(20 mg/kg)and dexanabinol(0.85 mg/kg),for 2 successive *** results revealed that solid lipid nanoparticle loading with curcumin and dexanabinol increased the m RNA and protein expression levels of the mature neuronal markers neuronal nuclei,mitogen-activated protein 2,and neuron-specific beta-tubulin III,promoted the release of dopamine and norepinephrine,and increased the m RNA expression of CBR1 and the downstream genes Rasgef1c and Egr1,and simultaneously improved rat locomotor ***,solid lipid nanoparticles loaded with curcumin and dexanabinol had no antidepressant effects on the CBR1~(–/–)mouse models of major depressive *** study was approved by the Institutional Ethics Committee of Tongji Hospital of Tongji University,China(approval No.2017-DW-020)on May 24,2017.

关键词： biocompatibility curcumin depression dexanabinol dopamine nanoparticles norepinephrine

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Reaction Activity of Kao linite Surfaces:Quantum Chemistry Calculations

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Journal of Wuhan University of Technology(Materials Science) 2003年第1期18卷 9-12页

作者：洪汉烈 WuhanUniversityofTechnology

The anion kaolinite surface interactions and AuS - adsorption onto the surfaces of kaolinite were studied using the self consistent field discrete variation (SCF-X α-DV) *** structure and energies of the system of anion AuS - adsorbed on an atomic cluster of kaolinite were *** results show that the systems with lower total energy are those AuS - adsorbed on the edge surfaces,which indicates that the systems of adsorption of AuS - on the edges are more stable relative to those adsorbed on the basal *** the other hand,bond order data suggest that significant shifting of atomic charge and the overlapping of electronic cloud between Au (Ⅰ) of the AuS - and the surface ions of kaolinite would take place in the systems with AuS - being adsorbed on the edges,especially at the site near Al ***,it can be concluded that edge sites will dominate the complexation reactions of the surfaces of kaolinite,with negligible contributions from other functional groups on the basal plane,which are dominated by either siloxane sites in silica layers or aluminol sites in gibbsite layers.

关键词： quantum chemistry kaolinite surface reaction adsorption functional group

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Two new compounds from Coriaria nepalensis

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Chinese Chemical Letters 2011年第9期22卷 1078-1080页

作者： Jian Hong Yang Jian Xin Pu Xue Du Hai Bo Zhang Wei lie xiao Han Dong Sun State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of Botany Chinese Academy of Sciences Kuming 650204 China

Two new compounds. corialins A （1） and B （2） were isolated from Coriaria nepulensis Wall. These new compounds were established as 7-hydroxy-3-[2,3-acetonidc-（3-methylhutane）] coumarin （1） and 3-O-β-D-glucopyr... 详细信息

关键词： Coriaria nepalensis Corialin A Corialin B NMR techniques

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