發(fā)布時間：2018-11-11 20:49

【摘要】：以2年生桉樹人工林及桉樹、格木混交林為對象,對其造林初期林地土壤理化性質(zhì)的變化進(jìn)行研究,探討其土壤理化性質(zhì)、土壤酶活性與土壤酚類物質(zhì)間的關(guān)系。結(jié)果表明:(1)兩種林分根區(qū)土壤pH值較小,0—20cm土壤pH值大于20—40cm,混交林林間0—20cm土壤自然含水率、容重、最大持水量、總孔隙度、通氣度均較桉樹純林大;對林間20—40cm土層而言,桉樹×格木混交林容重、總孔隙度、通氣度、排水能力均比桉樹純林大,自然含水率、最大持水量相反。(2)混交林林間0—20cm土壤脲酶活性最大,為1.46mg/(g·h),脲酶、磷酸酶及多酚氧化酶活性均表現(xiàn)為桉樹根區(qū)大于格木根區(qū),且較桉樹純林桉樹根區(qū)大。(3)桉樹純林根區(qū)總酚、復(fù)合酚含量最大,混交林林間0—20cm水溶酚含量最大,土壤水溶酚含量范圍為0.62~2.04μg/g。桉樹純林造林初期土壤中酚類物質(zhì)含量較低,未造成土壤酚類物質(zhì)的積累;桉樹與格木混交初期能改善土壤理化性質(zhì),提高土壤酶活性;土壤理化性質(zhì)、土壤酶活性與酚酸物質(zhì)含量間存在著一定的相關(guān)性。
[Abstract]:The changes of soil physical and chemical properties of 2-year old eucalyptus plantation, eucalyptus and mixed plantations were studied, and the relationship between soil physical and chemical properties, soil enzyme activity and soil phenolic substances was discussed. The results were as follows: (1) the pH value of soil in the root zone of the two forests was small, the pH value of 0-20cm soil was more than 20-40 cm, and the natural moisture content, bulk density, maximum water holding capacity, total porosity and aeration of 0-20cm in mixed forest were larger than those in pure eucalyptus forest; For 20-40cm soil layer, the bulk density, total porosity, aeration and drainage capacity of eucalyptus 脳 lattice mixed forest were higher than those of pure eucalyptus forest, and the natural moisture content and maximum water holding capacity were opposite. (2) the urease activity of 0-20cm soil in mixed forest was the highest. The activities of 1.46mg/ (g h), urease, phosphatase and polyphenol oxidase showed that the root area of eucalyptus was larger than that of the root area of eucalyptus, and it was larger than that of pure eucalyptus forest. (3) the total phenol and the content of compound phenol were the highest in the pure forest of eucalyptus. The water soluble phenol content of 0-20cm in mixed forest was the highest, and the range of soil water soluble phenol was 0.62 ~ 2.04 渭 g / g. The content of phenols in the soil of pure eucalyptus forest was low in the early stage of afforestation, which did not cause the accumulation of phenolic substances in the soil, and the physical and chemical properties of soil and the activity of soil enzyme were improved in the early stage of mixed eucalyptus and grid trees. There was a certain correlation between soil physical and chemical properties, soil enzyme activity and phenolic acid content.
【作者單位】： 廣西國有高峰林場;廣西林業(yè)科學(xué)研究院;廣西大學(xué)林學(xué)院;
【基金】：國家自然科學(xué)基金(31260176) 廣西自然科學(xué)基金(2015GXNSFAA139081)
【分類號】：S714.2

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