中亚热带三种森林类型凋落物现存量及碳氮储量

Litter Biomass and Its Carbon and Nitrogen Storage in Three Forests in Central Subtropical China

在福建三明市罗卜岩省级自然保护区,选择立地条件一致的武夷桦天然林、米槠天然林和马尾松天然林为研究对象,对其林下凋落物现存量及碳氮储量进行了研究。结果表明:三种森林类型总凋落物现存量平均值为马尾松天然林(15.90 t·hm^(-2))>武夷桦天然林(8.73 t·hm^(-2))>米槠天然林(4.91 t·hm^(-2)),除米槠林外,武夷桦天然林和马尾松天然林的凋落物未分解层现存量均表现为叶>枝>果;3种森林类型凋落物碳储量最大为马尾松天然林(7.28 t·hm^(-2)),其次为武夷桦天然林(3.70 t·hm^(-2)),米槠林最低(2.30 t·hm^(-2)),氮储量最大为马尾松天然林(156.60 kg·hm^(-2)),显著大于武夷桦天然林(59.60 kg·hm^(-2))和米槠林(46.90 kg·hm^(-2));3种森林凋落物的碳氮含量均呈极显著正相关(P<0.001)。

The litter biomass and its carbon and nitrogen storage in three forests including Betula wuyiensis, Castanopsis carlesii and Pinus massoniana under the same site condition in Luobuyan Provincial Nature Reserve were investigated.The results showed that the range of total litter biomass in the three forest types was P. massoniana forest(15.9 t·hm^-2)> B. wuyiensis forest(8.73 t·hm^-2)> C. carlesii forest(4.91 t·hm^-2). Except for C. carlesii forest, the existing litter component was leaf>branch>fruit in B. wuyiensis and P. massoniana forests. The highest litter carbon storage was in P.massoniana forest(7.28 t·hm^-2), followed by B. wuyiensis forest(3.70 t·hm^-2), and the lowest was in C. carlesii forest(2.30 t·hm^-2). The highest litter nitrogen storage was in P. massoniana forest(156.6 kg·hm^-2), which is significantly higher than that in B. wuyiensis forest(59.6 kg·hm^-2) and the C. carlesii forest(46.9 kg·hm^-2). The litter carbon and nitrogen contents of the three forests were all significantly positively correlated(P<0.001).