| 摘要: |
| 【目的】研究秦岭南坡2种林分类型的林冠层对大气降水水质的影响，探讨林冠层对大气降水水质的生态学效应，为水源林建设提供理论依据。【方法】在秦岭火地塘林区选取红桦（Betula albo-sinensis Burkill）林和锐齿栎（Quercus aliena var.acuteserrata）林2种林型，检测大气降水通过这2种林分林冠层所形成的林内穿透雨的水质，并与大气降雨的水质进行比较，研究林冠层对水质的影响。【结果】红桦林、锐齿栎林林冠层均有降低雨水酸性的作用，其中锐齿栎林提升降水pH的能力相对较强；2种林分的林冠层对大气降雨中的NO3-均表现出较强的吸附作用，而对于NH4+则表现出较强的淋溶作用；锐齿栎林林冠层吸附大气降雨中Na的能力及被大气降雨淋溶出PO43-、Ca和Mg的能力均明显强于红桦林林冠层；红桦林林冠层被大气降水淋溶出K的能力明显强于锐齿栎林林冠层；红桦林林冠层和锐齿栎林林冠层对降雨中Cu、Pb、Cd、Cr有较明显的净化作用，2种林分对同一种元素的净化能力基本接近；锐齿栎林林冠层净化大气降水中As的能力要优于红桦林林冠层。【结论】森林林冠层对大气降水有一定的净化作用。 |
| 关键词: 秦岭南坡 红桦 锐齿栎 林冠层 水质 |
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| 基金项目:国家林业公益性行业科研专项(201204502) |
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| Ecological effects of canopies of two forest types on rain water quality on the south slope of Qinling Mountains |
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LIU Yong-jie,DANG Kun-liang,WANG Lian-he,et al
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| Abstract: |
| 【Objective】This study aimed to investigate the effects of canopies of two forest types on south slope of Qinling Mountains on water quality of atmospheric precipitation,thereby revealing the ecological effects of forest canopy on atmospheric precipitation and providing theoretical basis for construction of water conservation forest.【Method】We used two forest types,Betula albo-sinensis Burkill and Quercus aliena var.acuteserrata,in Huoditang forest region in Qingling Mountains for detecting quality of water falling through the canopy layers and comparing with that of atmospheric precipitation.【Result】Canopies of both B.albo-sinensis Burkill and Q.aliena var.acuteserrata reduced the acidity of rain water,the latter reduced more strongly.The two forest canopies had a great ability of absorbing NO3- and enriching NH4+ in rain water.Q.aliena var.acuteserrata canopy had better ability of absorbing Na and enriching PO43-,Ca and Mg,while B.albo-sinensis Burkill canopy was better at enriching K in rain water.Moreover,both forest canopies had identically strong purification effects on Cu,Pb,Cd,and Cr in rain water,while Q.aliena var.acuteserrata canopy had greater ability of purifying As in rain water.【Conclusion】Forest canopy had a purification effect on atmospheric precipitation. |
| Key words: Qinling Mountain range Betula albo-sinensis Burkill Quercus aliena var.acuteserrata forest canopies water quality |
