施用城市固体垃圾肥对杉木生长的影响

采用完全随机区组设计，分别对杉木造林前穴底、幼林及中龄林施城市固体垃圾肥，以研究该肥对杉木生长的影响．结果表明，杉木造林前穴底施垃圾肥肥效显著，以每穴施 ３７．５ ｋｇ 肥效最好，第２ 年地径、树高生长量分别比对照增加２７．６８％ 和２５．４１％ ；幼林施垃圾肥对杉木生长有一定促进作用，当年肥效不明显，其中 ３７．５ｋ ｇ／株垃圾肥处理在第 ３ 年胸径、树高生长量分别比对照增加２１． ２９％ 和 ２４．１４％ ，不同施肥处理第 ３ 年对杉木生长效应排序为：垃圾肥 ３７．５ ｋｇ／株（记为 Ｌ３７．５）＞ Ｌ２５＞ Ｌ１２．５＞ Ｎ０．２５（尿素０．２５ ｋｇ／株）；杉木中龄林施垃圾肥具有明显增产效应，随时间推移，各施肥处理对杉木生长效应排序为：Ｌ３７．５＞ Ｌ２５＞ Ｎ０．２５＞ Ｌ１２．５．，且肥效渐趋明显

Application of Biosolid to Chinese Fir Plantation

Responses to biosolid fertilization before planting in young plantation and middle aged plantation were studied by randomized block designing . The results are as follows .Growth response to biosolid fertilization at the planting point before planting was significant . The highest growth response appears in the treatment applied with 37.5 kg biosolid per planting point; it shows an increase of 27.68% in basal diameter and 25.41% in height compared with no fertilization treatment.. Biosolid fertilization has some effects on the growth of young Chinese fir plantation; however ,its growth response to biosolid fertilization is not significant in the first year compared with no fertilization treatment .The growth of the treatment applied with 37.5kg biosolid per tree is promoted by 21.29% in D.B.H and by 24.14% in height respectively in the third year .Their growth responses of different treatments in the third year are in the sequence of 37.5 kg biosolid per tree >25 kg biosolid per tree >12.5 kg biosolid per tree >0.25 kg urea per tree .Growth response in middle aged Chinese fir plantation is also significant to biasolid fertilization .It becomes obvious as time goes on .Their growth responses are in the sequence of 37.5 kg bilsolid per tree >25 kg biosolid per tree >0.25 kg urea per tree >12.5 kg biosolid per tree .