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采用凋落物分解袋法研究了亚热带常绿阔叶林区6个典型树种马尾松(Pinus massoniana)、柳杉(Cryptomeria fortunei)、杉木(Cunninghamia lanceolata)、香樟(Cinnamomum camphora)、红椿(Toona ciliata)和麻栎(Quercus acutissima)凋落叶木质素与纤维素第1年降解特征。结果表明:6种凋落叶质量损失率的大小顺序依次为红椿(72.09%)>柳杉(58.61%)>杉木(51.07%)>麻栎(50.38%)>马尾松(31.08%)>香樟(27.75%);6种凋落叶木质素浓度动态不一致,纤维素浓度则整体上呈现一直下降的变化动态;第1个分解年,木质素降解率大小顺序依次为红椿(88.36%)>麻栎(61.21%)>柳杉(56.41%)>杉木(55.44%)>香樟(37.10%)>马尾松(24.10%),纤维素降解率大小顺序依次为红椿(99.22%)>杉木(90.58%)>柳杉(86.84%)>麻栎(84.70%)>香樟(76.40%)>马尾松(71.30%);季节性降雨极显著地影响凋落叶木质素和纤维素降解率(P<0.01),6种凋落叶木质素和纤维素在雨季时期均有较大的降解量;亚热带常绿阔叶林6种凋落叶木质素和纤维素第1年降解主要发生在雨季,凋落叶木质素和纤维素在分解初期旱季的降解速率基本一致,而在季节性降雨期,纤维素降解速率快于木质素的降解速率。
Six representative tree species, Pinus massoniana, Cryptomeria fortunei, Cunninghamia lanceolata, Cinnamomum camphora, Toona, were planted in the subtropical evergreen broad-leaved forest using the litter decomposition bag method ciliata and Quercus acutissima litter leaves lignin and cellulose 1 year degradation characteristics. The results showed that the order of the mass loss rate of the six kinds of litters was as follows: (72.09%)> Cryptomeria fortunei (58.61%)> Chinese fir (51.07%)> Quercus acutissima (50.38%)> Masson pine (27.75%). The dynamic changes of lignin concentrations in the six kinds of litter were inconsistent, while the concentrations of cellulose in the litter showed a decreasing trend as a whole. In the first decomposition year, the order of lignin degradation was as follows: Cunninghamia lanceolata (61.21%), Cryptomeria japonica (56.41%), Cunninghamia lanceolata (Cunninghamia lanceolata), Cinnamomum camphora (37.10%) and Masson pine (24.10%). The order of cellulose degradation was: (90.58%)> Cryptomeria fortunei (86.84%)> Quercus acutissima (84.70%)> Camphora (76.40%)> Pinus massoniana (71.30%); seasonal rains significantly affected litter lignin and cellulose degradation rate P <0.01). The lignin and cellulose of the six kinds of litter had a larger amount of degradation in the rainy season. The lignin and cellulose of the six litters in the subtropical evergreen broad-leaved forest mainly occurred during the rainy season and litterfall The degradation rate of lignin and cellulose in the early dry season was basically the same, while in the seasonal rainfall, the degradation rate of cellulose was faster than the degradation rate of lignin.