Abstract:

In order to explore the effects of site conditions on yield and quality of Dendrocalamopsis oldhami shoots and provide scientific basis for site selection and improvement of bamboo shoot quality in the process of Dendrocalamopsis oldhami shoot forest cultivation,this paper studied the yield,shape index and nutrient content of Dendrocalamopsis oldhami shoots on three sites with relatively consistent management measures (low mountain and hilly land,farmland and alluvial land),and the soil factors affecting the shape and nutrient composition of bamboo shoots were determined by redundancy analysis (RDA). The results showed that:(1)the soil fertility of farmland was better than that of low mountain and hilly land,and significantly better than that of alluvial land; (2) The amount of bamboo shoots in farmland cultivation was the highest (16 990 kg/hm²),the 3-year-old green bamboo and non standing bamboo underground bamboo stumps had almost no ability to produce bamboo shoots; (3)The shape indexes of bamboo shoots in low mountain and hilly land and farmland were better than those in alluvial land. The weight,shelled net weight and edible rate of commercial bamboo shoots in low mountain and hilly land were the highest,and the basal diameter and length of bamboo shoots in farmland were the highest; The shape indexes of 1 and 2-year-old shoots in the three sites were significantly better than that of 3-year-old bamboo shoots; (4)The nutrition of bamboo shoots in low mountain and hilly land was the highest,the total amount of soluble sugar,crude protein and amino acids in low mountain and hilly land and farmland cultivated land were significantly higher than those in alluvial land,while the content of crude fiber was significantly lower than that in alluvial land; (5) RDA analysis indicated that the contents of total N (the contribution is 27.3%),total K (the contribution is 22.2%),available K (the contribution is 11.0%) and alkali hydrolyzed N (the contribution is 10.7%) in soil were the main factors affecting the shape components of bamboo shoots,the total soil P (the contribution is 89.6%) and pH (the contribution is 4.3%) were the main factors affecting the nutritional indexes of bamboo shoots.

Key words: site conditions, Dendrocalamopsis oldhami, yield, quality, redundancy analysis