美国黑核桃实生幼苗地上部分生长规律研究

Study on the Aboveland Part's Growth Law of Juglans nigra Seedling

根据连续 2 a的 11个品种的 2～ 3 a实生美国黑核桃生长量的观测结果 ,分析认为 :试验范围内 ,黑核桃实生幼苗物候期因品种不同而不同。1a中 ,主要生长期在 4月底～ 9月底 ,整个生长期约为 80～ 15 0 d,生长期短 ,其中主要生长旺盛期为 15～ 45 d。引种栽培的 11个品种实生苗均表现出不同程度的冬季抽干现象 ,顶梢生长量受到一定的限制 ,每年的顶梢生长量在“生长一抽干回缩一生长”的循环中增加 ,危害最轻的是 Hay,所有品种需进行冬季防抽干措施保护。

The results of continuous 2 years growth volume survey of 11 varieties Juglans nigra seedling, which are 2 to 3 years, show that seedling phonological periods are different because of different varieties. In one year, main growth period is between the end of April and the end of September, and the whole growing period is 80～150 days, The 11 varieties seedling all show air-dry phenomenon more or less. The growth volume of the tip of the branch is limited, and the volume increases in the cycle of 'grow-air-dry and dwindle-grow' every year. Hay is the least damaged. All varieties are needed protect against air-dry in winter.