杉木连栽地上闽楠与杉木林分凋落物特征比较

通过对杉木多代连栽地轮栽闽楠后凋落物的特征研究.结果表明:闽楠林分的年凋落量比杉木多代连栽林(对照)增加了2 262.02 kg.hm-2,两树种的凋落物年组成成分的变化规律基本一致,都以叶的凋落量为最大,其次是枝条,再次是花果,第4是杂叶,第5是碎屑,最少的是杂枝.闽楠林凋落物的归还模式是主峰出现在4月份,占年凋落物总量的45.37%,该月的凋落物组成以叶为主,占月凋落量的绝对量(93.43%);而杉木多代连栽林则主峰出现在8月份,占年凋落物总量的48.49%,该月的凋落物组成虽也以杉叶为主,但它只约占了月凋落量的一半(48.35%),且杉木多代连栽林最大月的凋落量比闽楠林最大月的凋落量减少了900.62 kg.hm-2.凋落物的季节归还模式2种亦不同,闽楠林呈现出春季(50.40%)>秋季(24.19%)>夏季(23.04%)>冬季(2.37%),而杉木多代连栽林则呈现出秋季(53.06%)>春季(24.07%)>夏季(15.76%)>冬季(6.48%).

Comparison on litterfall character of Phoebe bournei and Cunninghamia lanceolata plantation in the field of successive planting Cunninghamia lanceolata

The characteristic of litter was studied in the forest of Phoebe bournei in the filed after successive planting Cunninghamia lanceolata.The results showed that the annual litterfall of P.bournei forest was 2 262.02 kg·hm~(-2) which was more than that of the successive planting forest of C.lanceolata (CK).The changing law of annual litter of the two kinds of forests were similar,namely,leaf was the largest,next branch,flower mixed with fruit,mixed leaf,then crumb,and the last was mixed branch.The return pattern of P.bournei forest was that maximum litterfall appeared in April,accounting for 45.37% of the whole yearly litterfall,leaf being the main litter and taking the most percentage(93.43%) of lunar litterfall;That of successive planting forest of C.lanceolata presented in August,accounting for 48.49% of the whole yearly litter,leaf also being the main litter but only taking about the half(48.35%) of lunar litterfall.The largest lunar litterfall quantity of the forest of C.lanceolata was 900.62 kg·hm~(-2) which was less than that of the P.bournei forest.The return patterns of seasonal litterfall in the two forests were different,seasonal litterfall of P.bournei forest showing spring(50.40%)>autumn(24.19%)>summer(23.04%)>winter(2.37%),however,that of the successive planting forest of C.lanceolata showing autumn(53.06%)> spring(24.07%)>summer(15.76%)>winter(6.48%).