桉树人工林取代长周期人工林对土壤入渗特性的影响

发布时间：2018-03-19 19:55

本文选题：土壤水分入渗　切入点：单环　出处：《水土保持研究》2017年06期 　论文类型：期刊论文

【摘要】：广西桉树人工林的前茬主要为轮伐周期较长的松杉类人工林,为探讨上述植被变化对林地土壤水分下渗的影响,采用单环法研究了8年生(06-EU),5年生(09-EU),4年生(10-EU)和1年生(13-EU)等第一代桉树(Eucalyptus urophylla E.grandis)人工林及其对照林21年生针阔混交(93-CM),第三代2年生桉树(12-EU3),18年生杉木(Cunninghamia lanceolate,96-CL)和马尾松(Pinus massoniana,96-PM)等人工林的土壤水分下渗特征,并采用BEST-intercept方法对土壤入渗特征参数进行估算。结果表明:(1)针阔混交和马尾松人工林改为桉树人工林后,土壤(0—20cm)容重分别降低13.5%和18.3%,孔隙度分别增加10.1%和14.8%,但土壤颗粒组成的变化不显著;(2)针阔混交林改为桉树人工林后,土壤初始入渗速率和前600s下渗量分别降低38.2%和25.3%,而杉木人工林、马尾松人工林则分别升高23.9%,148.1%和32.7%,97.2%;(3)连载代次的增加对桉树林土壤基本物理性质影响不显著,但会降低土壤水分下渗性能,第三代桉树林的初始入渗速率和前600s下渗量比第一代减少39.9%和32.4%。容重较大的林地在造林和抚育过程中的松土活动导致了土壤大孔隙增加,这是土壤水分下渗速率变化的主要成因。
[Abstract]:The forecrop of Eucalyptus plantation in Guangxi was mainly pine and fir plantation with long rotation period. In order to study the effect of the above vegetation change on soil moisture infiltration in forestland. The first generation eucalyptus urophylla E. grandisi plantations, such as 8-year-old Eucalyptus urophylla E. grandisis, 8-year-old Eucalyptus urophylla urophylla E. grandisis (8-year old, 5-year-old 09-EUOU, 4-year-old, 10-EUU), and their control forests, such as the 21-year-old coniferous and broad-leaved forest, the third generation of 2-year-old eucalyptus, the third generation of 2-year-old eucalyptus, the 18-year-old Cunninghamia lanceolate96-CL6-CL6-CLA and Pinus massoniana 96-PMPMPM, were studied by single ring method. Soil moisture infiltration characteristics of artificial forest, The characteristic parameters of soil infiltration were estimated by BEST-intercept method. The results showed that the mixed coniferous and broad-leaved forests and Pinus massoniana plantations were changed into eucalyptus plantations. Soil bulk density decreased by 13.5% and 18.3cm, porosity increased by 10.1% and 14.8 respectively, but the change of soil particle composition was not significant (P < 0.05). The coniferous and broad-leaved mixed forest was changed to eucalyptus plantation. The initial infiltration rate and the infiltration amount in the first 600s decreased by 38.2% and 25.3, respectively, while that of Chinese fir plantation and Pinus massoniana plantation increased by 23.98.1and 32.7%, respectively. The increase of successive generations had no significant effect on the basic physical properties of eucalyptus soil. The initial infiltration rate of the third generation eucalyptus forest and the infiltration amount of the first 600s decreased by 39.9% and 32.42.The loosening of soil in the forestland with larger bulk density resulted in the increase of the soil macropores during the afforestation and tending process, but the infiltration rate of the third generation eucalyptus forest and the infiltration amount of the first generation eucalyptus forest decreased by 39.9% and 32.4s. This is the main cause of soil water infiltration rate change.
【作者单位】：广西大学林学院;广西大学生态工程研究所;
【基金】：国家自然科学基金项目“桉树人工林主要生态水文过程及其对产流的影响机理”(31360134)
【分类号】：S714

【相似文献】