雪被厚度对色季拉山典型森林土壤理化性质的影响  

Effect of Different Snow Cover Thickness on the Physicochemical Properties of Typical Forest Soils in the Sejila Mountains

作　　者：高宛宛 金明月 侯磊[1,2] GAO Wanwan;JIN Mingyue;HOU Lei(Resource&Environment College,Tibet Agricultural&Animal Husbandry University;Key Laboratory of Forest Ecology in Tibet Plateau,Ministry of Education,Nyingchi Tibet,860000,China)

机构地区：[1]西藏农牧学院资源与环境学院 [2]西藏高原森林生态教育部重点实验室,西藏林芝860000

出　　处：《高原农业》2023年第4期429-436,444,共9页Journal of Plateau Agriculture

基　　金：西北农林科技大学-西藏农牧学院科研联合基金项目(XNLH2022-04);西藏自治区科技创新基地自主研究项目(XZ2022JR0007G);西藏高原森林生态教育部重点实验室开放课题(XZA-JYBSYS-2020-07)。

摘　　要：为了解雪被变化对西藏森林土壤理化性质的影响,以藏东南色季拉山急尖长苞冷杉林为例,采集无雪及有雪(10 cm、20 cm、30 cm)下土壤样本,系统的分析了不同雪被厚度下土壤理化性质变化特点。研究表明:含水率在无雪时稍低,有雪时突然增加而后减少,pH值的变化则与含水率相反。土壤养分中,有机质和全氮呈递减趋势(P<0.05),全钾呈递增趋势(P<0.05)。可见雪被变化对含水率、pH值、有机质、全氮、全钾影响较大。土壤重金属Cu、Zn未造成森林土壤污染。这说明季节性雪被覆盖会对森林土壤水分、酸碱性及土壤养分产生一定程度影响,继而可能影响林下植被及土壤生物格局。This study aims to investigate the influence of snow cover change on the physicochemical properties of forest soils in the Sejila Mountains of southeast Tibet,using the Abies georgei var.smithii forest as a case study.Soil samples were collected under no snow conditions and varying snow depths(10 cm,20 cm,and 30 cm) to systematically analyze the characteristics of soil physicochemical properties under different snow cover thicknesses.The results revealed significant effects of snow cover variation on water content,pH,organic matter,total nitrogen,and total potassium levels in the soil.Specifically,water content exhibited a slight decrease in the absence of snow but significantly increased and subsequently decreased with the presence of snow.Conversely,pH values showed an opposite trend to water content variations.In terms of soil nutrients,organic matter and total nitrogen exhibited a decreasing trend(P< 0.05),while total potassium displayed an increasing trend(P<0.05).Notably,soil heavy metals such as copper(Cu) and zinc(Zn) did not induce forest soil contamination.These findings highlight the significant influence of seasonal snow cover on soil moisture,acidity,and nutrient availability,which may subsequently impact the understory vegetation and soil biogeography.

关 键 词：雪被 土壤理化性质 急尖长苞冷杉林 色季拉山 西藏 

分 类 号：S714.2[农业科学—林学]