西藏南伊沟原始林芝云杉林水文学过程的水化学特征  

Chemical Characteristics of Hydrological Processes in a Primeval Picea likiangensis var.linzhiensis Forest in Nanyigou of Tibet

作　　者：方江平[1,2] 项文化[1] 刘韶辉[1,3] 

机构地区：[1]中南林业科技大学生命科学与技术学院,长沙410004 [2]西藏农牧学院高原生态研究所,林芝860000 [3]国家林业局发展规划与资金管理司,北京100714

出　　处：《林业科学》2010年第9期14-19,共6页Scientia Silvae Sinicae

基　　金：国家"十一五"科技支撑项目(2006BAD03A0702);西藏林芝高山森林生态系统国家野外科学观测研究(2006-2010)

摘　　要：2006-10—2007-09,对采自西藏南伊沟原始林芝云杉林的大气降水、穿透水、树干茎流、地表径流和壤中流水样进行养分含量测定,与该森林所在流域的溪流江河水样进行对比。结果表明:该地区大气降水的pH值为7.61,颗粒物含量较低(5.56mg·L-1),SO42-含量最高7.201mg·L-1,N的含量较低0.505mg·L-1,其他各种离子或元素的含量相对较低;穿透水中SO42-和Zn含量有所下降,但其他元素含量均有所增加;树干茎流中各元素的含量均高于穿透水,除SO42-外,其他各元素为正淋溶;地表径流和壤中流的SO42-,Zn和Fe含量低于大气降水的浓度,其他元素的含量高于大气降水;溪流HCO3-,K,Ca,Na,Mg和Cu含量均大于大气降水。P,Fe,N,Zn,Cl-和SO24-经过土壤、地被物的吸附和植物的吸收,其输出量小于输入量,系统对这些元素具有积累和净化作用。Chemical concentrations in rainfall,throughfall,stemflow,soil infiltration and surface runoff were measured in a primeval Picea likiangensis var.linzhiensis forest in Nanyigou of Tibet from October 2006 to July 2007.There were a lower silt concentration of 5.56 mg·L-1 and pH value of 7.61 in the rainfall outside the forest.SO42-concentration was highest（7.201 mg·L-1） of all ions or elements in the rainfall.N concentration was lower（0.505 mg·L-1）.Other elements had relative low concentrations in the rainfall.SO42-and Zn concentrations were reduced in throughfall,but other elements were increased.All elements had higher concentrations in stemflow than in throughfall.Except for SO24-,other elements displayed a positive canopy leaching.The concentrations of SO24-,Zn and Fe were lower in surface runoff and soil infiltration than in rainfall,while other elements were concentrated in surface runoff and soil infiltration.The stream had more HCO 3-,K,Ca,Na,Mg,and Cu than rainfall,suggesting loss of those elements in the forest.The stream contained less P,Fe,N,Zn,Cl-and SO42-than rainfall,due to adsorption in the soil and litter and absorption by plants.Our results provided a basic knowledge for further study on the nutrient cycling and evaluation on role of the forest in the water purification.

关 键 词：林芝云杉 原始林 水化学特征 养分含量 西藏 

分 类 号：Q661.1[生物学—生物物理学] S718.5[农业科学—林学]