喀斯特树轮记录的土壤侵蚀历史研究

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1 周运超 已出版文章查询
周运超
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2 王可可 已出版文章查询
王可可
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1贵州大学贵州省森林资源与环境研究中心,贵阳,550025

2贵州大学贵州省森林资源与环境研究中心,贵阳550025; 贵州省普定喀斯特生态系统研究站,普定562100

3贵州省兴仁县林业局,兴仁,563000


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在贵州中部典型喀斯特石漠化区选择2个试验样地进行树轮地貌学研究,通过对样地内计22对裸露和非裸露树根进行野外测定并取样进行室内测试,表明喀斯特裸露根系记录了土壤侵蚀结果,裸露树根解剖结构显示土壤侵蚀发生时树根细胞生长发生明显变化,显示出年轮突然变窄、细胞明显减小、或者早材细胞数量减少等,同时,纤维面积、导管管胞面积也发生显著下降,多达70.66%,少则39.20%,而这种变化仅只与土壤侵蚀有关,结合树根年龄测定,得到土壤侵蚀发生的准确时间,并据此计算出样地尺度土壤侵蚀的动态过程,其中普定土壤侵蚀量发生在2002-2007年之间,平均侵蚀速率为每年0.484 t贞丰土壤侵蚀发生在2005-2007年之间,平均侵蚀速率为每年0.051 t。树轮记录的土壤侵蚀不仅可以同一个物种进行测定,还可以多物种共同记录,这为以多物种阔叶混交林为主要植被的喀斯特土壤侵蚀记录的研究提供了强有力的方法而树轮记录的土壤侵蚀量大大大于径流场监测的流失量,显示喀斯特地下流失为主,流失量占总土壤侵蚀量的2/3。

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DOI: http://dx.doi.org/10.5814/j.issn.1674-764x.2015.04.009

语种: 英文   

基金Foundation:the National Key Basic Research Development Pro...

关键词喀斯特 树轮 土壤侵蚀过程 地下侵蚀量


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