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Variation of soil physical-chemical characteristics in salt-affected soil in the Qarhan Salt Lake,Qaidam Basin

Journal of Arid Land 2022年第3期14卷 341-355页

作者： HUI Rong TAN Huijuan LI Xinrong WANG bingyao Shapotou Desert Research and Experiment Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

soil salinization has adverse effects on the soil physical-chemical ***,little is known about the changes in soil salt ion concentrations and other soil physical-chemical characteristics within the Qarhan Salt Lake and at different soil depths in the surrounding ***,we selected five sampling sites(S1,S2,S3,S4,and S5)alongside the Qarhan Salt Lake and in the Xidatan segment of the Kunlun Mountains to investigate the relationship among soil salt ion concentrations,soil physical-chemical characteristics,and environmental variables in April *** results indicated that most sites had strongly saline and very strongly saline *** main salt ions present in the soil were Na^(+),K^(+),and Cl^(-).soil nutrients and soil microbial biomass(SMB)were significantly affected by the salinity(Psoil salt ions(Na^(+),K^(+),Ca2+,Mg^(2+),Cl^(-),CO_(3)^(2-),SO_(4)^(2-),and HCO_(3)^(-))were positively correlated with electrical conductivity(EC)and soil water content(SWC),but negatively related to altitude and soil *** soil salt ions,soil nutrients and SMB were positively correlated with altitude,but negatively related to EC and ***,soil nutrients and SMB were negatively correlated with soil salt *** conclusion,soil nutrients and SMB were mainly influenced by salinity,and were related to altitude,soil depth,and SWC in the areas from the Qarhan Salt Lake to the Xidatan *** results imply that the soil quality(mainly evaluated by soil physical-chemical characteristics)is mainly influenced by soil salt ions in the areas surrounding the Qarhan Salt *** results provide an accurate prediction of how the soil salt ions,soil nutrients,and SMB respond to the changes along a salt *** underlying mechanisms controlling the soil salt ion distribution,soil nutrients,and SMB in an extremely arid desert climate playa should be studied in greater detail in the future.

关键词： salinization soil salt ions soil physical-chemical characteristics soil microbial biomass soil nutrient Qarhan Salt Lake

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Assessment of organic compost and biochar in promoting phytoremediation of crude-oil contaminated soil using Calendula officinalis in the Loess Plateau, China

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Journal of Arid Land 2021年第6期13卷 612-628页

作者： WANG Jincheng JING Mingbo ZHANG Wei ZHANG Gaosen ZHANG Binglin LIU Guangxiu CHEN Tuo ZHAO Zhiguang Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Key Laboratory of Extreme Environmental Microbial Resources and Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Gansu Key Laboratory of Protection and Utilization for Biological Resources and Ecological Restoration Longdong UniversityQingyang 745000China State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China School of Life Sciences Lanzhou UniversityLanzhou 730000China

The Loess Plateau,located in Gansu Province,is an important energy base in China because most of the oil and gas resources are distributed in Gansu *** the last 40 a,ecological environment in this region has been extremely destroyed due to the over-exploitation of crude-oil *** of crude-oil contaminated soil in this area remains to be a challenging *** this study,in order to elucidate the effects of organic compost and biochar on phytoremediation of crude-oil contaminated soil(20 g/kg)by Calendula officinalis,we designed five treatments,i.e.,natural attenuation(CK),planted *** only(P),planted *** with biochar amendment(PB),planted *** with organic compost amendment(PC),and planted *** with co-amendment of biochar and organic compost(PBC).After 152 d of cultivation,total petroleum hydrocarbons(TPH)removal rates of CK,P,PB,PC and PBC were 6.36%,50.08%,39.58%,73.10%and 59.87%,*** and root dry weights of *** significantly increased by 172.31%and 80.96%under PC and 311.61%and 145.43%under PBC,respectively as compared with P(Pchemical characteristics and enzymatic activity of soil in different treatments were also *** highest total N,total P,available N,available P and SOM(soil organic matter)occurred in PC,followed by PBC(Psoil dehydrogenase(DHA)and polyphenol oxidase(PPO)activities in PB were lower than those of other treatments(Psoil microbial community composition,Proteiniphil

关键词： total petroleum hydrocarbons soil physical-chemical characteristics plant physiological parameters soil enzyme microbial community composition

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