马尾松低产林分套种火力楠生长效果分析

指出了在福建省闽南地区贫瘠山地营造马尾松纯林，由于土壤瘠薄干燥，幼林生长不良，易形成低产林分。在马尾松纯林套种了火力楠后，成为异龄混交林，经过十几年的经营管理，混交林木生长良好。实践证明：马尾松低产林套种火力楠后，能促进林木生长，提高林木生长量，增加蓄积量，可改良土壤，增加土壤肥力，改善林地生态条件。马尾松火力楠混交林的林木生长量，分别比马尾松、火力楠纯林的林木生长量树高提高24．00％、2．54％％，胸径增粗2．57％、5．14％，蓄积量提高11．35％、3．57％。林分生物量提高14．44t/hm2、30．88t/hm2，土壤肥力N、P、K ，分别提高6．00％、1．92％，6．15％、1．47％，5．00％、1．45％。

Growth Effect aAnalysis of Interplanted Michelia macclurel in Low-yielding Stand of Pinus massoniana

Pure forest ofPinus massonianawas afforested on the barren mountainous areaof southernFujian Province ,w hich resulted in the formation of low -yielding stand with young poor trees due to the barren and drysoil .After interplanted withMichelia macclurel ,the forestbecame uneven -aged mixed forest andgrow wellafter decades of management .This practice proves that interplanting with Michelia macclurel in Pinus massoniana forestcanpromote tree growth and increase stock volume ,as well as enhance soil fertility and im-prove forest ecological conditions .Compared with the pure forest of Pinus massonianaandofMichelia mac-clurel ,the tree grow th of themixed forest increases24 .00% and 2 .54% % respectively ,the diameter at breast height（DBH）grows2 .57% and 5 .14% ,the stock volume rises11 .35 and 3 .57% ,while the stand biomass en-hances14 .44 t/hm2 and 30 .88 t/hm2 ,andthe three major elements of N ,P and Kw hich representthe fertility of soil ,increase6 .00% ,1 .92% and 6 .15% respectively .