刈割强度对狗牙根光合产物分配的动态影响

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关键词： C4 植物；光合产物分配；狗牙根；刘割； 13C 脉冲标记中图分类号：S812.8 文献标识码：A 文章编号：1007-0435（2025）08-2521-10

Abstract：Photosynthetic product alocation strategy is acrucial mechanism for plants to cope with stressful distur bance and enhance their environmental adaptation.In this study，we investigated the dynamic efects of mowing intensity on the allocation of photosynthetic products in C4 herbaceous plant（Cynodon dactylon） by using the 13C pulse labeling technique. The results showed that mowing significantly influenced the δ13C allocation ratios in leaves，stems，and roots（ P<0.001） ，as well as the contents of non-structural carbohydrates （NSC）（ P< 0.001）and secondary metabolites（SM） （P<0.05） .After mowing，C. dactylon significantly increased the δ13C allocation ratio to leaves while decreasing the ratio to stems （ （P<0.05） . Mowing significantly reduced NSC and SM contents in roots but increased SMcontent in stems.Under light and moderate mowing，leaf NSC content significantly increased，whereas heavy mowing led to a significantly higher leaf SM content compared to other treatments （ P<0.05） . With the extension of recovery time，light mowing gradually reduced the δ13C allocation ratio to leaves，while heavy mowing further decreased the ratio to stems and increased alocation to leaves and roots.These findings would provide a reference for the scientific and rational management ofartificial grassland.

Key words： C4 plant; Photosynthetic product alocation; Cynodon dactylon ; Mowing; 13C pulse labeling

光合产物分配策略是植物适应多变环境、维持生长与竞争能力的核心机制，其对于揭示植物响应资源与胁迫的生态学机制具有重要意义[1]。（剩余18040字）