Wang Chun, Dong Xue-Ting, DU Rui-Peng, Zhang Zhi-Dong, Huang Xuan-Rui
Hebei Province Key Laboratory of Forest Trees Germplasm Resources and Forest Protection/College of Forestry, Agricultural University of Hebei, Baoding 071000, Hebei, China.
Ying Yong Sheng Tai Xue Bao. 2021 May;32(5):1709-1716. doi: 10.13287/j.1001-9332.202105.008.
Litter is an important contribution to forest soil. Litter decomposition plays an important role in nutrient cycling of forest ecosystem. A field litterbag experiment was conducted to examine the dynamics of decomposition rate, nutrient release and enzyme activity during litter decomposition in the pure forests of (L) and mixed forests, including L and (B), L and (Q), as well as LBQ, in Saihanba area, Hebei Pro-vince, China. The results showed that the decomposition rate of leaf litter in L forest was significantly lower than that in mixed forests during the 720 d decomposition. The LB had the highest decomposition rate of L leaf litter. All treatments had the same change trend of nutrient contents, with the contents of N and P being increased and that of C, K and C/N being decreased. Contrast to pure leaf litter of L, leaf litter in mixed forests could promote the release of C and K, and inhibit litter N and P release. During the litter decomposition, the activities of catalase, urease and acid phosphatase increased, while that of sucrase decreased in all leaf litter of forests. The decomposition rate of leaf litter was positively correlated with the activities of catalase, urease and acid phosphatase, negatively correlated with that of sucrase. Our results showed that leaf litter mixture of , . and . could enhance the litter decomposition of , and that enzyme activities were closely related to litter decomposition.
凋落物是森林土壤的重要组成部分。凋落物分解在森林生态系统的养分循环中起着重要作用。在中国河北省塞罕坝地区，进行了一项野外凋落物袋试验，以研究落叶松（L）纯林以及落叶松与白桦（B）、落叶松与青杄（Q）混交林以及落叶松 - 白桦 - 青杄（LBQ）混交林中凋落物分解过程中分解速率、养分释放和酶活性的动态变化。结果表明，在720天的分解过程中，落叶松纯林中叶凋落物的分解速率显著低于混交林。落叶松 - 白桦混交林中叶凋落物的分解速率最高。所有处理的养分含量变化趋势相同，氮和磷含量增加，碳、钾含量以及碳氮比降低。与落叶松纯叶凋落物相比，混交林中的叶凋落物能促进碳和钾的释放，并抑制凋落物中氮和磷的释放。在凋落物分解过程中，所有森林叶凋落物中的过氧化氢酶、脲酶和酸性磷酸酶活性增加，而蔗糖酶活性降低。叶凋落物的分解速率与过氧化氢酶、脲酶和酸性磷酸酶活性呈正相关，与蔗糖酶活性呈负相关。我们的结果表明，白桦、青杄和落叶松的叶凋落物混合可以增强落叶松的凋落物分解，并且酶活性与凋落物分解密切相关。
