简介：Fuzzyassociationrules(FARs)canbepowerfulinassessingregionalsoilquality,acriticalsteppriortolandplanningandutilization;however,traditionalFARsminedfromsoilqualitydatabase,ignoringtheimportancevariabilityoftherules,canberedundantandfarfromoptimal.Inthisstudy,wedevelopedamethodapplyingdifferentweightstotraditionalFARstoimproveaccuracyofsoilqualityassessment.AftertheFARsforsoilqualityassessmentweremined,redundantruleswereeliminatedaccordingtowhethertherulesweresignificantornotinreducingthecomplexityofthesoilqualityassessmentmodelsandinimprovingthecomprehensibilityofFARs.Theglobalweights,eachrepresentingtheimportanceofaFARinsoilqualityassessment,werethenintroducedandrefinedusingagradientdescentoptimizationmethod.ThismethodwasappliedtotheassessmentofsoilresourcesconditionsinGuangdongProvince,China.Thenewapproachhadanaccuracyof87%,when15rulesweremined,ascomparedwith76%fromthetraditionalapproach.Theaccuracyincreasedto96%when32rulesweremined,incontrastto88%fromthetraditionalapproach.TheseresultsdemonstratedanimprovedcomprehensibilityofFARsandahighaccuracyoftheproposedmethod.

简介：Environmentalriskspertainingtocontaminatedsoilshavebeenwellstudied,whilelittleattentionhasbeenpaidtotherisksofthesoilsafterremediation.Inthisstudy,aconceptmodeldevelopedbasedonfuzzysettheorywasappliedtoevaluatetheuncertaintiesofthreeriskindicators,namely,plantgrowth,groundwatersafetyandhumanhealth,ofarestoredsitethathadbeenpreviouslypollutedbyheavymetals.Theconceptmodelclassifiedthegradeandimportanceofriskfactorsbyan11-levelrankingsystemandwasabletoyieldacomprehensiveriskresultratherthanmulti-riskresultsforcomplexriskindicators.Modelingresultsshowedthattheriskstothethreeindicatorswereeffectivelyreducedaftertheremediation.Moreover,greatsensitivityoftheriskswasfoundrelatedtotheweightdistributionamongthethreeriskindicators.Ingeneral,therisksofbothpollutedandrestoredsoilstotheenvironmentwereintheorderofgroundwatersafety>plantgrowth>humanhealth.Themodelwasprovedtosolvetheproblemsofmulti-riskresultsduetocomplexriskindicatorsthatpreviouslyencounteredbyotherresearchers,whichmadeithelpfulindecision-makingandmanagementofrestoredsoils.

简介：Wetlandsoilqualitydegradationcausedbylarge-scaleagriculturalreclamationontheSanjiangPlainofNortheastChinahasbeenwidelyreported.Arelativesoilqualityevaluation(RSQE)modelandaprojectionpursuitevaluation(PPE)modelbasedonreal-codedacceleratinggeneticalgorithmwereintroducedtoevaluatequalityvariationsintoplayersofthemainwetlandsoilsontheSanjiangPlainin1999and2003,respectively.Assoilqualitydegradationboundarieswerevague,thisstudyestablishedtwofuzzysyntheticevaluation(FSE)modelsbasedontheoriginaldataandcriteriausedintheRSQEandPPEmodels.TheoutputsofthetwoFSEmodelswereobtainedbychoosingtwofuzzycompositeoperatorsM(∧,∨)andM(·,⊕).StatisticalanalysisshowedthattheresultsoftheFSE,RSQE,andPPEmodelswerecorrelated.Inparticular,outputsoftheFSEmodelusingM(·,⊕)weresignificantlycorrelatedwiththoseoftheRSQEmodelwithr=0.989atP<0.01.ComparedwithRSQEandPPEmodels,theFSEmodelmaybemoreobjectiveinshowingsoilqualityvariationsandwasclosertothenaturalsituation,showingthefeasibilityandapplicabilityoftheFSEmodelinevaluatingsoilqualitydegradation.However,thechoiceofcompositeoperatorwasofcriticalimportance.ThestudyofwetlandsoilqualitydegradationontheSanjiangPlainwasofscientificandpracticalsignificanceforprotectionandmanagementofsoilsandforsustainabledevelopmentofagricultureinthisareainthefuture.

简介：通过多年采对类芦的生态特征、生物学特性的观察及绿化治理实践的研究，较系统地掌握了类芦适应恶劣生境的生长和抗逆特性，从而为类芦这个优良的乡土草种在我国南方水蚀荒漠化和矿山废弃物地区绿化治理的推广、应用提供了科学的依据。

简介：类芦是我国南方快速绿化水蚀荒漠化地区的优良草种。对类芦根蔸土壤中VA菌根真菌的调查表明，栽植类芦后，土壤中的VA菌根真菌数量大幅度增加，并与类芦根系形成一种协调的共生体系，极显著地促进了类芦的生长。新栽植类芦时，可在基肥中增施少量VA菌根土与磷肥，以促进土壤中VA菌根菌的快速繁衍。

简介：针对沿海花岗岩侵蚀地造林树种匮乏的局面以及生态系统稳定性差等现状，开展引进相思类树种造林试验。重点调查了不同相思树种在沿海花岗岩侵蚀地上的生长量和改良土壤效应，并应用统计学方法进行分析比较。试验结果表明，沿海花岗岩侵蚀地选择相思类树种造林能起到很好的水土保持作用，而且有助于改善造林地的土壤条件，提高林地肥力。引进相思类树种中以灰木相思的造林成效最好，纹荚相思次之，最后是卷荚相思。本研究为今后闽东沿海花岗岩侵蚀地的治理提供了重要的理论依据。

简介：研究长江三峡库区泥沙来源,并以此为依据开展水土保持工作,对于保障长江三峡水利枢纽工程安全运行和效益发挥,具有重要意义.在长江三峡花岗岩地区选定的典型小流域内,采用土壤剖面法及土壤侵蚀调查、坡面径流小区等方法,分析不同土地利用现状下的土壤物理特性及其与土壤侵蚀的关系,不同土地利用坡面及沟道的土壤侵蚀量.结果表明:研究区域不同土地利用状况土体内,土壤颗粒特性与土壤流失程度密切相关.随着土壤流失程度的增大,流域不同土地利用状况下的A层土壤颗粒粒径分选系数降低.不同土地利用状况下,土壤颗粒粒径组的对称性均较低;长江三峡花岗岩区的泥沙,主要来源于坡面土壤侵蚀;坡面侵蚀的泥沙主要来源于坡耕地,25°以上陡坡耕地侵蚀的泥沙量,约占坡面产沙总量的50%.

简介：福建长汀水蚀荒漠化山地，釆用栽植类芦、斑茅的办法，能快速覆盖地面，改善生态环境，促进芒萁的快速繁衍，并最终形成以马尾松＋芒萁为主要建群种的植被群落。

简介：强度水土流失区采用以类芦为主栽草种的治理措施,仅一年时间就能长成高大的类芦植丛,改变水土流失区恶劣的生境,为芒萁及其他乡土草种、灌木的快速侵入、生长创造条件,形成多草种、多灌木、乔木的植被群落,并为鸟类、昆虫及野生动物的栖息、繁衍创造了一定生境条件,逐步恢复水土流失地的生物多样性.

简介：不同于常规的工业园区,佛山（清远）产业转移工业园扩园以＂一园多区＂形式建设,园区建设具有＂园区点多面广,开发程度参差不齐,一园多区且分散、跨度大、敏感区域多＂等特点,水土保持防护措施设计时根据项目对应的特点,合理划分了水土流失防治分区,布设以工程保植物,以植物促工程互补的水土保持防护措施,并突出了＂生态、环保＂的水土保持设计理念。