Zheng Yaxiong, Guan Fengying, Fan Shaohui, Yan Xinrong, Huang Lanying
Key Laboratory of National Forestry and Grassland Administration, International Center for Bamboo and Rattan, Beijing, China.
National Location Observation and Research Station of the Bamboo Forest Ecosystem in Yixing, National Forestry and Grassland Administration, Beijing, China.
Front Plant Sci. 2022 Jan 27;12:799424. doi: 10.3389/fpls.2021.799424. eCollection 2021.
Strip clearcutting can significantly reduce the harvesting costs of moso bamboo forests. Although bamboo is characterized by rapid accumulation of biomass, it is still a concern that this management method may reduce long-term productivity. Nutrient cycling has long been considered essential for forests to maintain high primary productivity. However, nutrient cycling of bamboo forests after strip cutting has not been previously reported. We conducted a strip clearcutting experiment and surveyed the litter dynamics for 1 year. We assessed changes in litter nutrients in response to the cutting and calculated the nutrient resorption efficiency and litter decomposition rate to evaluate the effect on nutrient use efficiency and nutrient return. Our results showed that strip cutting had no significant effect on litter production and nutrient return in the moso bamboo forest ( > 0.05). However, annual litter biomass and nutrient return in reserved belts (RB) were significantly higher than those in the control (CK) ( < 0.05). P and K resorption efficiencies in RB were significantly higher than in CK during certain periods of bamboo growth ( < 0.05). We also observed that the annual decay constant of CK was significantly higher than that of plots that were strip clearcut (SC) ( < 0.05). Our results suggest that strip cutting does not affect nutrient use efficiency or storage in the short term.
带状皆伐可显著降低毛竹林的采伐成本。尽管竹子具有生物量快速积累的特点，但这种经营方式可能会降低长期生产力，这仍是一个令人担忧的问题。长期以来，养分循环一直被认为是森林维持高初级生产力所必需的。然而，此前尚未有关于带状皆伐后毛竹林养分循环的报道。我们进行了带状皆伐实验，并对凋落物动态进行了为期1年的调查。我们评估了凋落物养分对采伐的响应变化，并计算了养分重吸收效率和凋落物分解率，以评估对养分利用效率和养分归还的影响。我们的结果表明，带状皆伐对毛竹林的凋落物产量和养分归还没有显著影响（>0.05）。然而，保留带（RB）的年凋落物生物量和养分归还显著高于对照（CK）（<0.05）。在竹子生长的某些时期，RB中的P和K重吸收效率显著高于CK（<0.05）。我们还观察到，CK的年衰减常数显著高于带状皆伐地块（SC）（<0.05）。我们的结果表明，带状皆伐在短期内不会影响养分利用效率或养分储存。
