Hydro-chemical Characteristics and Metal Ions Transfer of Larix gmelinii var.principis rupprechtii Plantation in Xiaowutaishan
In 46-year Larix gmelinii var.principis-rupprechtii plantation in Xiaowutaishan,Hebei province,sample plot with 30m×40m was estab-lished to collect water sample from precipitation and redistribution processes(through-fall,stem flow,litter-through,runoff on slope)at early,middle and later stage of growth of plantation.Determination was implemented on water quantity,pH,and mass concentrations of Ca2+,Mg2+,K+,Na+,Zn2+,Mn2+,Fe2+,Cu2+.The results showed that the mass concentrations of Mg2+,Mn2+,Na+,Ca2+,Fe2+of through-fall and stem flow and that of K+,Na+,Mg2+,Zn2+,Mn2+of litter-through and runoff on slope at early stage were the highest in the 3 growth stages.Ca2+,Mg2+,K+,Na+,Zn2+,Mn2+,Fe2+showed leaching loss during redistribution process.At middle stage of growth,Ca2+,Mn2+,Cu 2+showed leaching loss,Mg2+,K+were adsorbed,and Na+,Zn2+,Fe2+had different performances during redistribution processes.At later stage of growth,the mass concentrations of Zn2+in through-fall and stem flow were the highest in the 3 growth stages.Ca2+,Mg2+,Zn2+,Mn2+,Fe2+showed leaching loss,and Na+,Cu 2+were adsorbed,and the performance of K+was different during redistribution processes.In the whole redistribution process,the mass concentration of Cu2+was ordered by later stage>middle stage>early stage.pH of through-fall,runoff on slope at middle stage,and runoff on slope at later stage was>7,that of the left process,pH was<7.The plantation interception had nearly 95%of precipitation.The amount of metal ions interception by litter was much higher than that by canopy and total amount of soil input.
Larix gmelinii var.principis-rupprechtii plantationhydro-chemical characteristicmetal ion transferHydro-chemical CharacteristicMet
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