摘要
以祁连山排露沟流域青海云杉林为研究对象,2013年5—9月份测定了33场大气降水、穿透雨和树干茎流的TOC、N、P、K、Ca和Mg等化学元素的浓度,分析了青海云杉林对降水化学特征的影响。结果表明:(1)生长季穿透雨和树干茎流与大气降水化学元素浓度相比,除穿透雨N和P浓度比值变小或没明显的变化外,其他化学元素浓度增加的倍数明显大于大气降水,其中K、Ca和Mg元素表现尤为明显;(2)生长季大气降水TOC、N、P、K、Ca、Mg等元素浓度大小分别为22.25、12.06、0.76、1.00、1.91、0.43 mg/L,穿透雨和树干茎流对应元素浓度大小分别为32.72、11.08、0.70、4.74、3.51、1.34 mg/L和40.71、17.97、3.00、26.16、11.49、2.47 mg/L;(3)总体来看,除TOC外,其他元素浓度较大值出现在5月份;随时间推移,树干茎流元素浓度均不断减小且波动明显,大气降水和穿透雨的TOC、N、P、K、Ca和Mg等元素浓度变化规律相似且波动不明显。
The Picea crassifolia forest in Pailugou watershed of Qilian mountains was selected as the research object, the concentration of TOC, N, P, K, Ca and Mg chemical elements of atmospheric precipitation, throughfall and stemflow were measured, the sample from 33 rain events from May to September,2013. Analyzed the influence on precipitation chemical characteristic ofPicea crassifolia forest. The results showed that： （1）At growing season, throughfall and stemflow compared with the concentration of atmospheric precipitation chemical element, in addition to N and P concentration ratio of throughfall smaller or no obvious changes, the increase were bigger than that of atmospheric precipitation in the concentration of other chemical elements concentrations, especially the K, Ca and Mg element;（2） At growing season, the TOC, N, P, K, Ca and Mg element concentration of atmospheric precipitation size were 22.25, 12.06, 0.76, 1.00, 1.91, 0.43 mg/L of throughfall and the stemflow concentration of corresponding element size were 32.72, 11.08, 0.70, 4.74, 3.51,1.34 mg/L and 40.71, 17.97, 3.00, 26.16, 11.49, 2.47 mg/L;（3） On the whole, in addition to the TOC, other elements concentration larger values appear in May, as time goes on, stemflow element concentrations were decreased and fluctuated significantly; the TOC N, P, K, Ca and Mg element concentrations of atmospheric precipitation and throughfall changing law is similar and the fluctuation is not obvious.
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2017年第11期127-131,145,共6页
Journal of Central South University of Forestry & Technology
基金
国家自然科学基金项目(91425301、31260141)
国家林业局陆地生态系统定位研究网络(CTERN)
关键词
青海云杉林
大气降水
穿透雨
树干茎流
祁连山
Picea crassifolia forest
atmospheric precipitation
throughfaU
stemflow
Qilian mountains
