桂西北环境移民安置区柑橘园土壤环境动态研究

*2001BA606A-8KZCX3-SW-426NK-D-152004-09-142004-10-24*410125pHNPKDynaLicsofsoilfertilityofcitrusorchardsindeLonstrationareaofenvironLentaliLLigrantsNorthwestGuangxi.XI-AORun-LinSUYi-RongHETie-GuangWANGKe-LinInstituteofSubtropicalAgricultureChineseAcademyofSciencesChangsha410125ChinaCJEA2005134135~137AbstractThedynamicsofsoilfertilityofcitrusorchardsindemonstrationareaofenvironmentalimmigrantsNorthwestGuangxiwasstudied.Theresultsshowthatthesoilfertilityleveldecreasesfirstandthenincreases.ThepHvaluedecreasesslightlyandacidityisstrengthened.Thecontentoforganicmatterdecreasesfirstandthenincreasesslightly.ThecontentoftotalNdecreasesandthecontentofhydrolysableNtotalPavailableKandavailablePhavebeenraisedasawhole.ThecontentoftotalKincreasesfirstandthendecreases.Finallythereasonsofthesoilnutrientchangesareexplained.KeywordsEnvironmentalimmigrantsCitrusorchardsSoilenvironmentSoilnutrientsReceivedSept.142004revisedOct.242004NPK1~41247hm2300~330d16.5~19.9࠷≥10࠷5500~6530࠷-5.2࠷38.7࠷414.1kJcm21389mm4~870.6%199610~12239hm2CitrusreticulataBlanco311996939hm2290~20cm412219989129173520011013-N-P-0.5molL20:0K10:11molLpH25:122.1pH134Vol.13No.4200510ChineseJournalofEco-AgricultureOct.20051pH1996pH4.73199824.299.3%200154.2219981.6%20011998pH199620011998pH1*Tab.1DistributionofsoilnutrientsinsoilprofilespHgkg-1Ngkg-1Pgkg-1Kgkg-1mgkg-1mgkg-1mgkg-1ItemspHvalueOrganicmatterTotalNTotalPTotalKAlkalinehydrolysisNAvailablePAvailableK**4.6132.542.390.2535.55144.28.0123.94.9020.451.290.2036.6061.84.222.05.174.380.840.1828.8325.42.616.85.32--0.15911.52--15.8*4**5~15cm20~100cm50~200cm2.22199619.8gkg199818.8gkg5.1%2001199811.2%22*Tab.2DynamicchangesofsoilnutrientsindifferentyearspHgkg-1Ngkg-1Pgkg-1Kgkg-1mgkg-1mgkg-1mgkg-1YearspHvalueOrganicmatterTotalNTotalPTotalKAlkalinehydrolysisNAvailablePAvailableK19964.73a19.8ab1.19a0.23c7.0b84.89b3.78b45.89b19984.29b18.8b0.60b0.49a10.3a105.80a1.75c37.81c20014.22b20.9a0.62b0.39b6.65b108.60a15.59a61.45a*P0.05nE172.3NPK2N19961.19gkg19980.60gkg49.6%0~20cmN1998~2001N200119983.3%1998199624.6%200119982.6%19975kgP19981996113.0%2001199820.4%219963.78mgkg19981.75mgkg53.7%200119987.92P1998PPNPPP1998K47.1%2001199835.4%K2K56K199817.6%136132001199862.5%2.41998PKPK3520013*Tab.3NutrientinthesoilofcitrusorchardsofKenfudemonstrationplotItems**NumberOptimumindexesofsampleSamplelessthanoptimumindexesSampleintheoptimumindexesSampleexceedingoptimumindexespH5.0~6.5292929290000gkg-115~30292981192820Ngkg-11.0~1.5292912298090Pgkg-11.0~1.8292929290000Kgkg-113~20292928281100mgkg-1100~200292921882100mgkg-110~40292929402500mgkg-180~150292926213800*199652001**78997%86%72%72%NPK3pHNKPKpH1..200319445~482..1997172141~1483..2001938~104..2003224416~4195..200121149~526..2005131139~1427..199516~98.pH.19972631~79.NPK.1990518~224137