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《22.我國(guó)23個(gè)土壤磷素淋失風(fēng)險(xiǎn)評(píng)估——ⅱ.淋失臨界值與土壤理化性質(zhì)和磷吸附特性的關(guān)系》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在教育資源-天天文庫(kù)。
1、維普資訊http://www.cqvip.com第26卷第9期生態(tài)學(xué)報(bào)Vo1.26。No.92006年9月ACTAECOLOGICASINICASep.,2006我國(guó)23個(gè)土壤磷素淋失風(fēng)險(xiǎn)評(píng)估Ⅱ.淋失臨界值與土壤理化性質(zhì)和磷吸附特性的關(guān)系趙小蓉,鐘曉英,李貴桐,鮑華軍,李浩浩,熊桂榮,林啟美(1.中國(guó)農(nóng)業(yè)大學(xué)資源與環(huán)境學(xué)院,北京looO94;2.湖北省農(nóng)業(yè)科學(xué)院植物保護(hù)與土肥研究所,武漢430064)摘要:從13個(gè)省(市)采取23個(gè)耕地表層土壤,通過(guò)室內(nèi)模擬試驗(yàn)測(cè)定其磷素淋失臨界值和pH、有機(jī)質(zhì)、<0.O1mm、<0.002mm、
2、交換性鈣鎂、活性鐵鋁、磷等溫吸附特性等,以建立土壤磷素淋失臨界值與土壤基本理化性質(zhì)和磷吸附特性之問(wèn)的關(guān)系。結(jié)果表明:土壤pH<6.0時(shí),隨土壤pH提高臨界值增加,土壤pH與臨界值之間呈顯著的指數(shù)關(guān)系;而當(dāng)土壤pH>6.0時(shí),隨土壤pH提高臨界值減小,在pH6.5左右土壤磷素淋失臨界值最高。土壤磷素淋失臨界值與土壤有機(jī)質(zhì)、活性鐵(鋁)、交換性鈣之間存在顯著的相關(guān),而與交換性鎂、CEC、<0.01mm、<0.002mm、K、Q的相關(guān)性受土壤酸堿度影響。可以通過(guò)測(cè)定土壤有機(jī)質(zhì)或活性鐵的含量,來(lái)計(jì)算土壤磷素淋失臨界值,評(píng)價(jià)土壤磷素淋失的風(fēng)
3、險(xiǎn)。供試的23個(gè)土壤,除了采自湖北潛江的2O號(hào)水稻土存在比較大的磷素淋失風(fēng)險(xiǎn),其余土壤發(fā)生磷素淋失的風(fēng)險(xiǎn)很小。關(guān)鍵詞:土壤;磷素淋失臨界值;土壤物理化學(xué)性質(zhì);磷吸附特性文章編號(hào):1000—0933(2006)09—3011-07中圖分類號(hào):S153。S154.1文獻(xiàn)標(biāo)識(shí)碼:ATheevaluationofphosphorusleachingriskof23ChinesesoftsⅡ.Therelationshipsbetweensoilproperties,Padsorptioncharacteristicsandtheleach
4、ingcriterionZHAOXiao—Rong,ZHONGXiao—Ying,LIGui—Tong,BAOHua—Jun,LIHao—Hao,XIONGGui—Rong2,LINQi—Mei(1.c0ofResourceandEnvironment,ChinaAguurⅡfUniity,Beijing100094,China;2.Institu把D廠PfnmProtenondSoilFertility,HubeiAcademyofAgriculturalScience,Wuhan430064,China).ActaEcolog
5、icaSinica,20O6,26(9):3011—3017.Abstract:23soilswerecollectedfromthecroplandsof13Chineseprovinces.TheirPleachingcriterionsweredeterminedbylaboratoryexperiments.SoilparametersincludingpH,organicmatter,cationexchangecapacity(CEC),<0.01mm,<0.002mm,exchangeableCaandMg,acti
6、veA1andFe,andPadsorptionisothermweremeasuredatsametime.ThepurposeofthisworkwastoestablishtherelationshipsbetweenthesoilpropertiesandthePleachingcriterionsobtainedfromtherelationshipsbetweenOlsen—PandCaC12一P.TheresultsshowedthatthePleachingcriterionsincreasedexponentia
7、llywithsoilpH<6.0.butdecreasedwithsoilpH>6.0.ThehighestvaluewasfoundatabeutsoilpH6.5.TherewerecloserelationshipsbetweensoilPleachingcriterionsandsoilorganicmatter,activeFe(A1),exchangeableCa.Ingeneral,exchangeableMg,CEC,<0.01mm,<0.002mm,KandQwerenotsignificantlyrelate
8、dwithPleachingcriterions.However,therelationshipswerehighinpH<6.0soils.ItisconcludedthatsoilPleachingcriterionscanbeestimate