Zheng Yaxiong, Fan Shaohui, Zhou Xiao, Zhang Xuan, Guan Fengying
International Center for Bamboo and Rattan, Key Laboratory of National Forestry and Grassland Administration, Beijing, China.
National Location Observation and Research Station of the Bamboo Forest Ecosystem in Yixing, National Forestry and Grassland Administration, Yixing, China.
Front Plant Sci. 2022 Oct 31;13:1064232. doi: 10.3389/fpls.2022.1064232. eCollection 2022.
Strip cutting can effectively reduce the cutting cost of bamboo forests and promote the transformation and upgradation of bamboo forests through mechanization and modernization. Despite the rapid accumulation of Moso bamboo biomass, the dynamics of five years changes in stand characteristics and productivity after cutting remain unclear. This is critical for formulating efficient bamboo forest management measures. In this paper, plots with an 8 m width strip cut (SC) and respective reserved belts (RB) were selected as the research object, and the traditional management forest (CK) as control. The dynamic characteristics of stand, biomass distribution pattern, and productivity change in the different treatment plots were studied for 5 years after cutting. The results showed that cutting increased the number of shoots and new bamboo, and decreased the diameter at breast height, height to crown base, and height of new bamboo (<0.05). Cutting reduces the productivity of both SC and RB, and allocates more biomass to the bamboo leaves to capture light in SC (<0.05). Over time, the characteristics of new bamboo in SC reached the level of CK, and the density of standing bamboo, and productivity, were higher than those in CK. However, the number and productivity of new bamboo decreased significantly in the RB (<0.05), which reflected the density restriction effect of bamboo forest. Further analysis showed that the increase in productivity in SC and CK was mainly from Moso bamboo at II and III "du", which positively correlated with the soil contents of total nitrogen, total phosphorus, and available phosphorus. It was suggested that after three On-year restorations, the SC could reach the level of CK, however it is necessary to density manage RB from the second On-year after cutting.
带状采伐能有效降低竹林的采伐成本，并通过机械化和现代化促进竹林的转型升级。尽管毛竹生物量迅速积累，但采伐后林分特征和生产力五年变化动态仍不清楚。这对于制定高效的竹林经营措施至关重要。本文选取8米宽带状采伐（SC）及相应保留带（RB）的样地作为研究对象，以传统经营林分（CK）作为对照。对采伐后5年不同处理样地的林分动态特征、生物量分配格局及生产力变化进行了研究。结果表明，采伐增加了笋和新竹数量，降低了新竹的胸径、冠高和竹高（<0.05）。采伐降低了SC和RB的生产力，且在SC中分配更多生物量到竹叶以捕获光照（<0.05）。随着时间推移，SC中新竹特征达到CK水平，立竹密度和生产力高于CK。然而，RB中新竹数量和生产力显著下降（<0.05），这反映了竹林的密度制约效应。进一步分析表明，SC和CK生产力的增加主要来自二度竹和三度竹，且与土壤全氮、全磷和有效磷含量呈正相关。建议经过三个大年恢复后，SC可达到CK水平，但采伐后次年起就有必要对RB进行密度调控。
