北川地区典型林分土壤抗蚀性分析  

Analysis of Soil Anti-erodibility of Different Typical Forests in Beichuan Area

作　　者：王俭成[1] 杨建英[1] 史常青[1] 梁超[1] 彭贤锋[1] 龚小强[1] 王俭斐 

机构地区：[1]北京林业大学水土保持学院,教育部水土保持与荒漠化防治重点实验室,北京100083 [2]石家庄市石津灌区管理局,石家庄050000

出　　处：《水土保持学报》2013年第1期71-75,共5页Journal of Soil and Water Conservation

基　　金：国家林业公益性项目“四川地震灾区灾后植被恢复及可持续发展关键技术研究与示范”(201104109)

摘　　要：以北川县8种典型林分土壤为对象,研究该区域内不同林分类型土壤的抗蚀性。结果表明:(1)不同林分土壤的抗蚀性具有明显差异,土壤抗蚀指数表现为二十年生柳杉林最大,达到66.3%,后依次为柳杉桤木混交林(51.9%)、杉木纯林(49.6%)、十年生柳杉纯林(34.6%)、五年生柳杉纯林(31.6%)、桤木林(30.7%)、楠竹林(20.4%),荒草坡的抗蚀指数最小,只有11.8%。(2)不同林分土壤剖面上、下层之间土壤抗蚀性有着明显差别。对于同一林地,土壤的抗蚀性上层一般要优于下层,土壤抗蚀指数0-20cm土层为20-40cm土层的1.0～1.6倍。土壤抗蚀指数随着浸水时间推移而降低,它与土粒浸水时间呈三次多项式函数关系。(3)通过运用主成分分析的方法,确定了土壤抗蚀性评价指标的3个主成分,分别为Y1、Y2、Y3,并确定了不同林分土壤抗蚀性的综合评价模型,即综合抗蚀性Y=0.552Y1+0.337Y2+0.111Y3。This paper studied anti-erodibility of eight different kinds of forest soil in Beichuan county. The results showed that （1）Anti-erodibility in different forest soil had significant differences, the anti-erodibility index of Cryptomeria fortunei of 20 years old was the biggest which has reached 66. 3%, followed by Cryptomeria fortunei and Alnus crernastogyne mixed forests （51.9 %） , Cunninghamia lanceolata （49.6 %） , Cryptomeria f ortunei of 10-year-old（34.6 %）, Cryptomeria f ortunei of 5-year-old（31.6%）, Alnus cremastogyne （30.7%）, Phyllostachys pubescens（20.4%）, barren grassland slope was the lowest one, just only 11.8%. （2）Anti-erodibility of different forest soil profilers upper and lower layer had obvious difference. To the same forest, the anti-erodibility of upper layer was better than lower layer, the soil anti-erodibility index of O -20 cm was 1.0-1. 6 times than 20--40 cm. Anti-erodibility index of the forest soil decreased with the increase of the time going, it had quadratic polynomial function relation with immersion time. （3）After using the method of principal component analysis, three principal component of soil anti-erodibility could be determine, which were Y1, Y2, Y3. Then the comprehensive evaluation model of different forests＇ anti- erodibility was found, which was comprehensive anti-erodibility Y=0. 552Y1 ＋0. 337Y2 ＋0. 111Y3.

关 键 词：抗蚀性 林地土壤 北川地区 评价体系 主成分分析 

分 类 号：S157.1[农业科学—土壤学]