Contribution of microarthropods to the decomposition of needle litter in a Japanese cedar (Cryptomeria japonica D. Don) plantation
Contribution of microarthropods to the decomposition of needle litter in a Japanese cedar (Cryptomeria japonica D. Don) plantation
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DOI：
10.1016/j.foreco.2006.07.005
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发表时间：
2006-10
影响因子：
3.7
通讯作者：
S. Joo;M. Yim;K. Nakane
中科院分区：
文献类型：
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作者：
S. Joo;M. Yim;K. Nakane
柳杉（Cryptomeria japonica D.）Don）人工林土壤-凋落物条件较差，这可能影响土壤-凋落物亚系统中微生物和动物群落的活性和组成。研究了微型节肢动物（蜱螨目和弹尾目）对腐殖酸分解过程的影响。在2年的时间里，用凋落物网眼箱对日本针叶凋落物进行了检查。5个月后，无动物区系箱（网目尺寸为25μm）中针叶凋落物的质量损失显著高于对照箱（网目尺寸为1 mm），而10个月后，针叶凋落物的质量损失显著低于对照箱。总微型节肢动物的密度与质量损失率密切相关，其中77%是弹尾虫和甲螨（隐气门目）。10个月后，对照处理的凋落物C/N比显著低于动物群排除处理。然而，箱中的微型节肢动物的存在下，固定在凋落物中的氮的量没有显着的影响。针叶凋落物的年分解速率（k）在对照处理中为0.377，在动物排除处理中为0.298。根据Seastedt方程（1984），小型节肢动物使针叶凋落物的分解速率（kfauna/ktotal）提高了21%。研究结果表明，微型节肢动物加速了C.日本针叶凋落物，尽管暂时抑制分解。
Japanese cedar (Cryptomeria japonica D. Don) plantations tend to have poor soil–litter conditions, which may influence the activity and composition of microbial and faunal communities in the soil–litter subsystems. The effects of microarthropods (Acarina and Collembola) on the decomposition processes of C. japonica needle litter were examined with litter mesh boxes over a 2-year period. After 5 months, the mass loss of needle litter in the fauna-excluded boxes (mesh size 25μm) was significantly higher than that in the control boxes (mesh size 1mm) but after 10 months, it was significantly lower than that in the control boxes. The density of total microarthropods, 77% of which were collembolans and oribatid mites (Cryptostigmata), was strongly correlated with the mass loss rate. The C/N ratios of the litter in the control treatments were significantly lower than those in the fauna-excluded treatments after 10 months. However, the presence of microarthropods in the boxes had no significant effect on the amounts of nitrogen immobilized in the litter. Annual decomposition rates (k) of needle litter were 0.377 in the control treatment and 0.298 in the fauna-excluded treatment. Based on Seastedt's equation (1984), microarthropods increased the decomposition rate of needle litter (kfauna/ktotal) by 21%. Our results indicate that microarthropods accelerate the overall decomposition rate of C. japonica needle litter, despite inhibiting decomposition temporarily.