检索结果-南通市图书馆

同方期刊数据库

Factors Affecting Distribution of Vegetation Types on Abandoned Cropland in the Hilly-Gullied Loess Plateau Region of China

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2008年第1期18卷 24-33页

作者： jiao ju-Ying J. TZANOPOULOS P. XOFIS J. MITCHLEY Institute of Soil and Water Conservation Northwest Sci-Technology University of Agriculture and Forestry Yangling Shaanxi 712100 (China) Centre for Agro-Environmental Research Department of Agriculture The University of Reading Barley Gate PO Box237 Reading RG6 6.4 R (UK) Imperial College London Department of Agricultural Sciences Wye Campus Wye Ashford Kent TN25 5AH (UK) nstitute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources Yangling Shaanxi 712100 (China)

A study was conducted in the forest-steppe region of the Loess Plateau to provide insight into the factors affecting the process of vegetation establishment,and to provide recommendations for the selection of indigenous species in order to speed up the succession process and to allow the establishment of vegetation more resistant to soil *** distinctive vegetation types were identified,and their distribution was affected not only by the time since abandonment but also by other environmental factors,mainly soil water and total P in the upper soil *** of the vegetation types,dominated by Artemisia scoparia,formed the early successional stage after abandonment while the other three types formed later successional stages with their distribution determined by the soil water content and total *** can be concluded that the selection of appropriate species for introduction to accelerate succession should be determined by the local conditions and especially the total P concentration and soil water content.

关键词： abandoned cropland Loess Plateau soil erosion vegetation variation

Decreasing magnitude of soil erosion along vegetation succession on sloping farmland in the Loess Plateau of China:5 years field monitoring evidence

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2022年第8期19卷 2360-2373页

作者： LIANG Yue jiao ju-ying TANG Bing-zhe CAO Bin-ting LI Hang State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationNorthwest A&F UniversityYangling 712100China State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationAcademy of Sciences and Ministry of Water ResourcesYangling 712100China

The impacts of vegetation restoration on the soil erosion have been widely elucidated in the semi-arid ***,the magnitude of soil erosion on abandoned sloping farmland still remained unclear and their responses to vegetation succession were rarely *** main objective of this study is to determine the magnitude of soil erosion along vegetation succession and explore the impact of vegetation succession on soil erosion from abandoned sloping *** observations were employed to monitor the rainfall,runoff,and soil erosion of seven sloping farmland plots with different abandoned ages and bare land from 2015 to *** results indicated that the annual runoff depth and soil erosion modulus of vegetation types were in the range of 0.46 to 5.49 mm·a^(-1)and 1.3 to 24.5 t·km^(-2)·a^(-1),*** vegetation effectively reduced the annual surface runoff and soil erosion with reduction of 73.8% to 97.8%and 98.0% to 99.9% as opposed to bare ***,there were no significant differences in runoff and soil erosion for different vegetation types along *** largest event of vegetation types contributed to 38.7%-44.1% of the annual runoff and 42.5%-66.3% of the annual soil erosion,*** restoration considerably alleviated the contribution of largest erosive event to annual soil *** relationships between soil erosion,runoff and rainfall factors could be fitted well by linear functions,and the performances of regression models in predicting runoff were more satisfactory compared to predicting soil *** Artemisia gmelinii(Agm)+Stipa bungeana(Sb)optimized the trade-off between sediment reduction and runoff maintenance,which should be selected as the suitable vegetation types to achieve the sustainability of socio-ecological systems.

关键词： Vegetation restoration Abandoned ages Soil erosion Vegetation types Abandoned slope Loess Plateau

Assessing sediment connectivity and its spatial response on land use using two flow direction algorithms in the catchment on the Chinese Loess Plateau

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2022年第4期19卷 1119-1138页

作者： YAN Xi-qin jiao ju-ying TANG Bing-zhe LIANG Yue WANG Zhi-jie State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationChinese Academy of Sciences and Ministry of Water ResourcesYangling 712100China Institute of Soil and Water Conservation Northwest A&F UniversityYangling 712100China University of Chinese Academy of Sciences Beijing 100049China College of Life Sciences Guizhou UniversityGuiyang 550025China

Severe soil and water loss have led to widespread land degradation on the Loess Plateau in *** the relationship between land use and sediment connectivity can be beneficial to control soil *** this study,three catchments in the Yanhe River Basin on the Loess Plateau were selected to analyse the relationship between land use and sediment connectivity using grey correlation *** of connectivity(IC)was employed to quantify sediment connectivity,including two flow direction algorithms(D8 and D-infinity)and two final targets of sediment transport(outlet and main channel of catchment).Then,11 landscape metrics were used to evaluate the land use spatial patterns of *** comparing the IC value ranges,histograms and classes,and their relationship with remote sensing images of the two flow direction algorithms,we find that the D8 algorithm is more suitable for this study *** results showed that the three catchments are characterized by high sediment connectivity in the grassland and forest close to the *** addition,the roads and bare land close to the channel also have high or medium sediment *** correlation analysis showed that landscape division index(DIVISION),fractal dimension index(FRACMN),aggregation index(AI),total class area,patch cohesion index(COHESION),and largest patch index(LPI)indices were the main factors that affect sediment connectivity at the class *** the landscape scale,the landscape shape index(LSI),Shannon’s diversity index(SHDI),and gully density have an essential effect on sediment *** condition provides a way to control the sediment connectivity in the watershed by transforming land use type or changing its spatial pattern,but specific adjustment measures have to be further explored.

关键词： Sediment connectivity Land use Landscape metrics Catchments Loess Plateau

Evidence-Based Dampness-Heat ZHENG(Syndrome) in Cancer: Current Progress toward Establishing Relevant Animal Model with Pancreatic Tumor

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2024年第1期30卷 85-95页

作者： jiao ju-ying CHENG Chien-shan CAO Zhang-qi CHEN Lian-yu CHEN Zhen Department of Integrative Oncology Fudan University Shanghai Cancer CenterShanghai(200032)China Department of Oncology Shanghai Medical CollegeFudan UniversityShanghai(200032)China

Cancer is one of the deadliest diseases affecting the health of human beings. With limited therapeutic options available, complementary and alternative medicine has been widely adopted in cancer management and is increasingly becoming accepted by both patients and healthcare workers alike. Chinese medicine characterized by its unique diagnostic and treatment system is the most widely applied complementary and alternative medicine. It emphasizes symptoms and ZHENG(syndrome)-based treatment combined with contemporary disease diagnosis and further stratifies patients into individualized medicine subgroups. As a representative cancer with the highest degree of malignancy, pancreatic cancer is traditionally classified into the "amassment and accumulation". Emerging perspectives define the core pathogenesis of pancreatic cancer as "dampness-heat" and the respective treatment "clearing heat and resolving dampness" has been demonstrated to prolong survival in pancreatic cancer patients, as has been observed in many other cancers. This clinical advantage encourages an exploration of the essence of dampness-heat ZHENG(DHZ) in cancer and investigation into underlying mechanisms of action of herbal formulations against dampness-heat. However, at present, there is a lack of understanding of the molecular characteristics of DHZ in cancer and no standardized and widely accepted animal model to study this core syndrome in vivo. The shortage of animal models limits the ability to uncover the antitumor mechanisms of herbal medicines and to assess the safety profile of the natural products derived from them. This review summarizes the current research on DHZ in cancer in terms of the clinical aspects, molecular landscape, and animal models. This study aims to provide comprehensive insight that can be used for the establishment of a future standardized ZHENG-based cancer animal model.

关键词： cancer Chinese medicine syndrome ZHENG dampness-heat syndrome animal model pancreatic tumor evaluation methods

Mapping of qGL7-2, a grain length QTL on chromosome 7 of rice

在线全文

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2010年第8期37卷 523-531页

作者： Gaoneng Shao Shaoqing Tang ju Luo Guiai jiao Xiangjin Wei Ao Tang Jianli Wu Jieyun Zhuang Peisong Hu State Key Laboratory of Rice Biology China National Rice Research lnstitt~te Hangzhou 310006 China

A residual heterozygous line （RHL） carrying a heterozygous segment between two S SR loci RM 11 and RM134 on the rice chromo- some 7 was selected from a set of recombinant inbred lines from the cross D50 （javanica）/HB277 （indica）. The former parent produces much longer grains than the latter. Selfed progenies of this selection were analyzed genotypically （SSRs） and phenotypically （grain length）. Grain length was discontinuously variable in the mapping populations, allowing for the placement of this QTL qGL7-2 within a -4.8 cM interval defined by RM351 and RM234. A set of new markers within this region were developed, which narrowed the QTL to a 278 kb region defined by the markers Indell and RM21945. This region contains 49 predicted genes. The results also suggest that the novel allele for grain length will be used for the application of marker assisted selection for the improvement of grain length.

关键词： grain length mapping quantitative trait locus residual heterozygous line rice

Spatiotemporal control of CRISPR/Cas9 gene editing

在线全文

学校读者我要写书评

暂无评论

Signal Transduction and Targeted Therapy 2021年第7期6卷 2088-2105页

作者： Chenya Zhuo Jiabin Zhang jung-Hwan Lee ju jiao Du Cheng Li Liu Hae-Won Kim Yu Tao Mingqiang Li laboratory of Biomaterials and Translational Medicine Center for NanomedicineThe Third Affiliated HospitalSun Yat-sen UniversityGuangzhouChina lnstitute of Tissue Regeneration Engineering(ITREN) Dankook UniversityCheonanSouth Korea Department of Nuclear Medicine The Third Affiliated HospitalSun Yat-sen UniversityGuangzhouChina PCFM Lab of Ministry of Education School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhouChina Department of Gynecology and Obstetrics The Third Affiliated HospitalSun Yat-sen UniversityGuangzhouChina Guangdong Provincial Key Laboratory of Liver Disease Research GuangzhouChina

The clustered regularly interspaced short palindromic repeats(CRISPRJ/associated protein 9(CRISPR/Cas9)gene editing technology,as a revolutionary breakthrough in genetic engineering,offers a promising platform to improve the treatment of various genetic and infectious diseases because of its simple design and powerful ability to edit different loci ***,failure to conduct precise gene editing in specific tissues or cells within a certain time may result in undesirable consequences,such as serious off-target effects,representing a critical challenge for the clinical translation of the ***,some emerging strategies using genetic regulation,chemical and physical strategies to regulate the activity of CRISPR/Cas9 have shown promising results in the improvement of spatiotemporal ***,in this review,we first summarize the latest progress of these advanced strategies involving cell-specific promoters,small-molecule activation and inhibition,bioresponsive delivery carriers,and optical/thermal/ultrasonic/magnetic ***,we highlight the advantages and disadvantages of various strategies and discuss their obstacles and limitations in clinical ***,we propose viewpoints on directions that can be explored to further improve the spatiotemporal operability of CRISPR/Cas9.

关键词： activation breakthrough consequences

Development of machine learning-based models to predict 10-year risk of cardiovascular disease:a prospective cohort study

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Stroke & Vascular Neurology 2023年第6期8卷 475-485页

作者： Jia You Yu Guo ju-jiao Kang Hui-Fu Wang Ming Yang Jian-Feng Feng Jin-Tai Yu Wei Cheng Institute of Science and Technology for Brain-Inspired Intelligence Department of NeurologyHuashan HospitalState Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain ScienceFudan UniversityShanghaiChina Key Laboratory of Computational Neuroscience and Brain-Inspired Intelligence Fudan UniversityMinistry of EducationShanghaiChina Zhangjiang Fudan International Innovation Center Fudan UniversityShanghaiChina School of Data Science Fudan UniversityShanghaiChina Fudan ISTBI-ZJNU Algorithm Centre for Brain-inspired Intelligence Zhejiang Normal UniversityZhejiangChina Shanghai Medical College and Zhongshan Hospital Immunotherapy Technology Transfer Center Fudan UniversityShanghaiChina

Background Previous prediction algorithms for cardiovascular diseases(CVD)were established using risk factors retrieved largely based on empirical clinical *** study sought to identify predictors among a comprehensive variable space,and then employ machine learning(ML)algorithms to develop a novel CVD risk prediction *** From a longitudinal population-based cohort of UK Biobank,this study included 473611 CVD-free participants aged between 37 and 73 years *** implemented an ML-based data-driven pipeline to identify predictors from 645 candidate variables covering a comprehensive range of health-related factors and assessed multiple ML classifiers to establish a risk prediction model on 10-year incident *** model was validated through a leave-one center-out *** During a median follow-up of 12.2 years,31466 participants developed CVD within 10 years after baseline visits.A novel UK Biobank CVD risk prediction(UKCRP)model was established that comprised 10 predictors including age,sex,medication of cholesterol and blood pressure,cholesterol ratio(total/high-density lipoprotein),systolic blood pressure,previous angina or heart disease,number of medications taken,cystatin C,chest pain and pack-years of *** model obtained satisfied discriminative performance with an area under the receiver operating characteristic curve(AUC)of 0.762±0.010 that outperformed multiple existing clinical models,and it was well-calibrated with a Brier Score of 0.057±***,the UKCRP can obtain comparable performance for myocardial infarction(AUC 0.774±0.011)and ischaemic stroke(AUC 0.730±0.020),but inferior performance for haemorrhagic stroke(AUC 0.644±0.026).Conclusion ML-based classification models can learn expressive representations from potential high-risked CVD participants who may benefit from earlier clinical decisions.

关键词： cardiovascular prediction learning

Pathways and mechanisms of lithium enrichment in brine deposits: Geochemical and isotopic evidence from the Bieletan section in the Qaidam Basin， northwestern China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth Science 2024年

作者： Yanjun Zhao Yufei Hu Lijian Shen Wanping Liu ju jiao Pengcheng jiao Chenglin Liu M.Santosh MNR Key Laboratory of Metallogeny and Mineral Assessment， Institute of Mineral Resources， Chinese Academy of Geological Sciences Qinghai Salt Lake Industry Co.， Ltd.， National Engineering Technology Research Center for Comprehensive Utilization of Salt Lake Resources，Qinghai Province Key Laboratory of Comprehensive Utilization of Salt Lake Resources China University of Geosciences(Wuhan) China University of Geosciences(Beijing) Department of Earth Science， University of Adelaide Yonsei Frontier Lab， Yonsei University

Bieletan is one of the most important salt lake brine lithium deposits within the Qaidam Basin， northwestern China. In this study， we present the results of chemical composition and isotopic analyses of Li and Sr in brine samples collected from Bieletan hydrological observation wells in different seasons in 2020. We evaluated the evolution processes of Li+， K+， and other ions in the reservoir under the combined influence of sulfate-type river water， CaCl2-type brines， and artificial recharge. In long-term observation wells， the composition of shallow brines varies， and the compositions of deep brines and brines in brine production wells are relatively stable. The concentrations of Li+and B3+in the northern area are higher than those in the southern area， and the ion concentrations of the deep brines in the long-term observation wells are slightly higher than those of the shallow brines. The concentrations of K+and Mg2+vary to some extent in both the deep and shallow brines of the long-term observation wells but are less affected by the season. However， the Ca2+and Sr2+concentrations of the shallow brines show notable seasonal variations， indicating a significant effect of CaCl2-type brines. The decreases in the Li and Sr isotopes of brines in Senie Lake are caused by the inflow of Wutumeiren River water during the high-water period. This finding indicates that during the high-water period， surface brines of salt lakes replenish intercrystalline brines， whereas during the dry season， the intercrystalline brines replenish Senie Lake. This mixed mineralization process resulted in Li+enrichment in the study area， with the highest Li+concentration occurring in the northern area of the Bieletan section. Although the Li+concentration in shallow brines decreases due to exploitation， we predict that deep brines with higher concentrations of Li+would serve as important reserves for sustainable development.

关键词：

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

黄土高原沟沿线的廊道防蚀效应探析

水土保持通报 2006年第5期26卷 108-110,118页

作者：焦菊英中国科学院水利部水土保持研究所

在分析黄土高原地区的沟沿线、沟沿线上下沟间地和沟谷地土壤侵蚀特征、小流域泥沙来源、坡沟侵蚀产沙关系的基础上,结合廊道的生态功能和以往的研究结果,认为在沟沿线的上部建立草灌与整地工程措施相结合的植物廊道,来拦蓄阻截沟间地... 详细信息

在分析黄土高原地区的沟沿线、沟沿线上下沟间地和沟谷地土壤侵蚀特征、小流域泥沙来源、坡沟侵蚀产沙关系的基础上,结合廊道的生态功能和以往的研究结果,认为在沟沿线的上部建立草灌与整地工程措施相结合的植物廊道,来拦蓄阻截沟间地的来水来沙,可使流域的土壤侵蚀量减少54．5%～77．0%。

关键词：沟沿线廊道植物篱土壤侵蚀黄土高原