凋落叶多样性对杉木幼苗生长及吸收^(15)N标记硫铵的影响  

Effects of plant foliar litter diversity on the growth of Chinese fir seedling and the absorption of (~ (15)NH_4)_2SO_4.

作　　者：黄志群[1] 汪思龙[1] 廖利平[1] 高洪[1] 陈龙池[1] 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110016

出　　处：《应用生态学报》2002年第10期1287-1290,共4页Chinese Journal of Applied Ecology

基　　金：中国科学院知识创新工程资助项目 (KZCX2 40 6) .

摘　　要：利用15N硫铵研究了凋落叶多样性对杉木幼苗生长及养分吸收的影响 .结果表明 ,凋落叶多样性的增加有利于盆栽杉木幼苗的生长 .杉木、火力楠、红栲和刺楸 4种凋落叶混合处理后 ,杉木幼苗的生长量最大 ;杉木、火力楠、刺楸 3种凋落叶混合处理后的杉木幼苗生长量次之 ,其它依次为杉木、火力楠、红栲 3种凋落叶混合处理 >杉木和刺楸凋落叶处理 >杉木和红栲凋落叶处理 >对照 >杉木和火力楠 2种凋落叶混合处理 >杉木凋落叶处理 .就杉木幼苗对硫铵氮的吸收率而言 ,不作任何处理的杉木幼苗吸收率最高 ,其次为杉木、火力楠、红栲和刺楸 4种凋落叶混合处理 ,其它依次为杉木、火力楠、刺楸 3种凋落叶混合处理和杉木、火力楠、红栲 3种凋落叶混合处理 >杉木和刺楸凋落叶处理 >杉木和红栲凋落叶处理>杉木和火力楠 2种凋落叶混合处理 >杉木凋落叶处理 .另外 ,用凋落叶处理后 ,土壤中硫铵氮的残留量比不作凋落叶处理的土壤多 ,硫铵氮的总回收量也比不作凋落叶处理的土壤大幅增加 ,而且凋落叶多样性的增加也会增加硫铵氮的残留量 .Effects of plant foliar litter species composition on the growth of the potted Chinese fir seedling and the absorption of (~ 15NH 4) 2SO 4 was studied.The result showed that there were significant growth responses to foliar litter treatments. A very noticeable trend was that as the tree species of foliar litter placed on pots increases, the growth of Chinese fir seedlings increases steadily. Seedling growth in four-species mixed foliar litter were the largest and that in Cunninghamia lanceolata+Michelia macclurei+Kalooanax septemlobus foliar litter mixture were the second. The others were in order of seedlings in C.lanceolata+M.macclurei+Castanopsis carlesii foliar litter mixture >C.lanceolata+K.septemlobus foliar litter mixture >C. lanceolata+C. carlesii>control (no foliar litter) >C.lanceolata+M.macclurei foliar litter mixture >Chinese fir foliar litter treatment. The recovery of (~ 15NH 4) 2SO 4 by Chinese fir seedlings in no foliar litter treatment was maximum, and seedlings grown in four foliar litter mixture was the second, then it was in order of C. lanceolata+C. carlesii+K.septemlobus=C.lanceolata+C.carlesii+M. macclurei>C.lanceolata+K.septemlobus>C.lanceolata+C.carlesii>C.lanceolata+M. macclurei>C.lanceolata foliar litter treatment. In addition, the residue of (~ 15NH 4) 2SO 4 was greater in soil with foliar litter treatment than in no foliar litter soil. Both of the residual amount of (~ 15NH 4) 2SO 4 in soil and the total recovery of (~ 15NH 4) 2SO 4 increased with the increasing tree species of applied foliar litter.

关 键 词：凋落叶多样性 杉木 幼苗生长 ^15N硫铵 养分吸收 

分 类 号：S718[农业科学—林学]