Abstract：A two-year study was conducted for the mechanism of shoot degradation of Chimonobambusa hejiangensis and influencing factors by sampling at five altitudes(400,600,800,1000 and 1200 m) in one of its natural distribution regions.The results showed:(1) The daily degeneration of Ch.hejiangensis in the two years shoot presented an uptrend and then down trend at different altitudes,while the accumulative shoot degeneration showed an increasing trend resembling Logistic curve.The medium altitude(600 m) was found to have the maximum total shoot degeneration rate(> 3000/667 m2),while two relatively higher altitudes(1000 and 1200 m) were found with higher total shoot degeneration rate(>65%) and entered the peak of degeneration earlier;(2) The shoot degradation was featured with the degradation of nutrients and mainly occurred at the ending period of shooting,while there were marked differences between two years regarding the degeneration probability;(3) The daily height increment of Ch.hejiangensis shoot about 10 days after shoot emergence might be an early criterion that could be used to distinguish normal and degenerating shoots;(4) Without interference from diseases,pests,human,animals,etc.,the shoot degeneration was positively correlated with shoot emerging amount and diameter of the stock plant,but significantly negatively correlated with the lowest atmosphere temperature and its extreme difference observed in the stand.In practices,fertilization and moderate mulching measures before or/and during the shooting period are recommended to decrease shoot degeneration.Moreover,picking or scavenging degenerating shoots in the initial shooting process might also help much to improve the shoot yield,and thus to promote the sustainable development of bamboo forest.
王光剑, 陈洪, 马光良, 李呈翔, 王晓娟, 杨东生, 王锐. 合江方竹退笋规律及影响因素研究[J]. 世界竹藤通讯, 2016, 14(1): 1-9.
Wang Guangjian, Chen Hong, Ma Guangliang, Li Chengxiang, Wang Xiaojuan, Yang Dongsheng, Wang Rui. Research on the Law and Influence Factors of Shoot Degeneration for Chimonobambusa hejiangensis. World Bamboo and Rattan, 2016, 14(1): 1-9.