Abstract:

Objective: This study aims to investigate the geographical variation of Dendrocalamus brandisii bamboo shoots quality in different planting regions and its relationship with the environment, and analyse the main influencing factors, so as to provide a reference basis for the management of D. brandisii and the improvement of bamboo shoots quality. Method: This study was conducted in seven different planting regions of D. brandisii in Yunnan Province (Mangshi, Simao, Shiping, Xinping, Changning, Linxiang, and Cangyuan). The external morphology and nutritional components of bamboo shoots from each location were measured, and variance, correlation, and redundancy analyses were conducted with site environmental factors such as soil chemical properties, climate, and altitude. Result: 1) There were significant differences in external morphology of D. brandisii bamboo shoots from different regions. The bamboo shoots from Changning had the highest base diameter and shoot length indicators, those from Cangyuan had the highest weight indicator, those from Mangshi had the highest edible portion indicator, and those from Shiping had the highest edible rate. 2) Bamboo shoots from different regions exhibited relatively high moisture content (AW). The tannin (Tan) content of bamboo shoots from Changning was significantly higher than that in other regions; the soluble sugar (SS) content in Mangshi was significantly higher than that in other regions; the crude fat (EE) content in Linxiang was significantly higher than that in other regions; the lignin (Lig), Ash, and protein (Pr) contents in Simao were significantly higher than those in other regions; and the cellulose (Cel) content in Xinping was significantly higher than that in other regions. 3) Correlation analysis showed that there was a significantly negative correlation between base diameter and low temperatures in August; a significant positive correlation between proline (Pro) and August precipitation; a significant positive correlation between arginine (Arg) and available potassium; and a significant positive correlation between Arg and air relative humidity and average temperature in August. 4) Redundancy analysis of environmental factors and D. brandisii shoot quality showed that nutrients in bamboo shoots, such as EE, Arg, His, Ser, Thr, and Pr, were positively responsive to available phosphorus and total phosphorus, while shoot length, weight, and edible portion exhibited a negative response. Shoot length, weight, edible portion, and AW were positively related to air relative humidity and average temperature in August. Nutrients in bamboo shoots, such as Pro, Ala, Tan, Glu, and Met, were positively responsive to August precipitation and negatively responsive to soil organic matter. Asp, SS, and edible rate were positively responsive to soil organic matter and negatively influenced by August precipitation. Conclusion: Among the seven regions, Changning has the best quality of D. brandisii bamboo shoots. The low temperature in August is the main environmental factor affecting the external morphology of D. brandisii bamboo shoots, while air relative humidity and average temperature in August are the main factors affecting the basic nutritional components of bamboo shoots. The amino acid content of D. brandisii bamboo shoots is mainly influenced by available potassium and August precipitation. The external morphology of bamboo shoots is positively correlated with soil organic carbon, air relative humidity, and average temperature in August, while the nutritional components of bamboo shoots exhibit a positive response to available phosphorus, total phosphorus, and August precipitation.

Key words: Dendrocalamus brandisii, bamboo shoot quality, geographic variation, site conditions, variance analysis, correlation analysis, redundancy analysis