CAJ | 학술논문

对闽南山区连续年龄序列(2 a、3 a、4 a、5 a、6 a)的尾巨桉(Eucalyptus urophyllaxE.grandis)人工林土壤有机碳及氮、磷、钾含量进行了分析,以评价土壤养分随林分年龄的变化动态.土壤有机碳、全氮、水解氮、全磷、速效磷均表现出随林分年龄增加而增加,到4 a生时达到最大,随后则呈下降趋势,6 a生时下降到最低值.速效钾含量则随林分年龄增加逐步下降,6 a生林分0～20 cm、20～40 cm和40～60 cm这3个土层速效钾含量分别比2 a生下降了53.2%、44.4%和55.2%;土壤全钾含量也表现出一定的下降趋势.所有年龄林分的土壤有机碳、全氮、水解氮、全磷、速效磷和速效钾含量均随土层深度增加而降低,而土壤伞钾则表现出相反的趋势.因此,在桉树人工林经营过程中,应定期增施钾肥,适时施用有机肥及氮、磷肥,以控制地力衰退.图4表2参24
대민남산구련속년령서렬(2 a、3 a、4 a、5 a、6 a)적미거안(Eucalyptus urophyllaxE.grandis)인공림토양유궤탄급담、린、갑함량진행료분석,이평개토양양분수림분년령적변화동태.토양유궤탄、전담、수해담、전린、속효린균표현출수림분년령증가이증가,도4 a생시체도최대,수후칙정하강추세,6 a생시하강도최저치.속효갑함량칙수림분년령증가축보하강,6 a생림분0～20 cm、20～40 cm화40～60 cm저3개토층속효갑함량분별비2 a생하강료53.2%、44.4%화55.2%;토양전갑함량야표현출일정적하강추세.소유년령림분적토양유궤탄、전담、수해담、전린、속효린화속효갑함량균수토층심도증가이강저,이토양산갑칙표현출상반적추세.인차,재안수인공림경영과정중,응정기증시갑비,괄시시용유궤비급담、린비,이공제지력쇠퇴.도4표2삼24
The contents of soil organic carbon, nitrogen, phosphorus and potassium in sequencially aged ( 2-, 3-, 4-, 5-, and 6-year old) Eucalyptus urophylla x E. grandis plantations were analyzed in the mountainous region of southern Fujian, China, to estimate the changes in soil nutrients with aging. The soil organic carbon content, total N, hydrolysable N, total P and available P increased with aging and reached maximum at 4 years of age, and thereafter decreased. Soil available K declined significantly with aging. Compared with the 2-year-old stand, soil available K under the 6-year-old stand decreased by 53.2%, 44.4% and 55.2% at the soil depths of 0～20 cm, 20～40 cm and 40～60 cm, respe4ctively. The soil total K also decreased with aging. The soil organic C, total N, hydrolysable N, total P, available P and available K supporting the plantations decreased with soil depth, in contrast the soil total K increased. Therefore, it is needed to apply K fertilizer regularly, and use organic manure, N and P timely in order to control soil degradation in the fast-growing eucalyptus plantation. Fig 4, Tab 2, Ref 24