不同火烧强度林火对大兴安岭北坡兴安落叶松林土壤化学性质的长期影响  

The Long-term Impacts on Chemical Properties of Larix gmelini Forest on the Northern Slope of Greater Hinggan Mountains from a Forest Fire of Varying Fire Intensity

作　　者：谷会岩[1] 金靖博[1] 陈祥伟[1] 王恩姮[1] 周一杨[1] 柴亚凡[1] 

机构地区：[1]东北林业大学林学院,哈尔滨150040

出　　处：《自然资源学报》2010年第7期1114-1121,共8页Journal of Natural Resources

基　　金：黑龙江省科技攻关项目(GB07B305;GB05B603);中央高校基本科研业务费专项资金资助(DL09EA03-3)

摘　　要：大兴安岭地区是林火多发区,论文比较了未火烧兴安落叶松林与火烧20 a后兴安落叶松(轻度、中度、重度火烧兴安落叶松林)土壤pH值、土壤养分以及土壤养分比值之间的差异。研究结果表明:重度、中度、轻度火烧森林土壤的pH值为4.79、4.76、4.63,高于对照森林土壤的pH值(4.53);重度、中度、轻度火烧森林土壤的C含量(55.19、84.63、127.91 g.kg-1)、N含量(2.32、3.97、5.27 g.kg-1)、P含量(0.22、0.21、0.25g.kg-1)和K含量(31.97、32.56、34.65g.kg-1)都低于对照森林土壤(137.67、5.61、0.27、37.96g.kg-1);重度、中度、轻度火烧森林土壤的C/N值(23.68、21.54、24.27)也低于对照土壤(24.63);轻度火烧土壤的C、N含量与中度、重度火烧土壤的C、N含量差异明显。说明了火烧20 a后,其森林土壤与对照森林土壤之间仍然有差异。Forest fires are frequent in the Greater Hinggan Mountain area and the intensity of these fires determines their impact on soil properties.We compared soil nutrient availability and soil nutrient ratio among three treatments（low-intensity fire,intermediate-intensity fire and high-intensity fire） and a control（intact forest） over a period of 20 years in a Larix gmelini forest in the northern slope of Greater Hinggan Mountains.The result shows： Soil pH value of topsoil（0-10 cm） in high-intensity,intermediate-intensity and low-intensity fire forest was 4.79,4.76 and 4.63 respectively,higher than that in control forest（pH 4.53）;soil pH value of subsoil（10-20 cm） in high-intensity and intermediate-intensity was 4.58 and 4.50 respectively,higher than that in control forest（pH 4.45）,it was not the same case for low-intensity fire forest（pH 4.44）.C concentration,N concentration,P concentration and K concentration of topsoil（0-10 cm） in high-intensity,intermediate-intensity and low-intensity fire forest was 55.19,84.63 and 127.91 g·kg-1;2.32,3.97 and 5.27 g·kg-1;0.22,0.21 and 0.25 g·kg-1;and 31.97,32.56 and 34.65 g·kg-1 respectively,lower than that in control forest（137.67,5.61,0.27 and 37.96 g·kg-1）;it was the same case for subsoil（10-20 cm）,C concentration,N concentration,P concentration and K concentration of subsoil（10-20 cm） in high-intensity,intermediate-intensity and low-intensity fire forest was 39.46,42.93 and 56.11 g·kg-1;1.24,1.72 and 2.31 g·kg-1;0.19,0.18 and 0.24 g·kg-1;31.18,31.95 and 33.83 g·kg-1 respectively,lower than that in control forest（63.11,2.59,0.25 and 36.16 g·kg-1）;the C/N ratio of topsoil（0-10 cm） in high-intensity,intermediate-intensity and low-intensity fire forest was 23.68,21.54 and 24.27 respectively,lower than that in control forest（C/N ratio 24.63）,it was the same case for C/P and C/K ratio in topsoil,while C/N ratio in subsoil presented a weaker trend.The difference of soil C and soil N in topsoil among low-intensity fir

关 键 词：林火 火烧强度 土壤特性 兴安落叶松林 

分 类 号：S714[农业科学—林学]