合江方竹的生长研究

Study on the growth of Chimonobambusahejiangensis[Poales: Poaceae]

论文对合江方竹幼竹的高生长过程的进行观测,通过最优分割法进行聚类分析,将合江方竹的生长过程分为初期、盛期、末期。其中盛期历时28 d,日平均高生长量23.4 cm,高生长量占全高的85.6%。合江方竹昼夜生长差异不大,高生长最快在2时,最慢在14时和4时左右。通过对合江方竹营养器官养分分析表明,同一元素在不同器官的含量不同,N元素含量顺序为:笋>叶>箨>枝>秆;P、K元素的含量顺序为:笋>箨>叶>枝>秆,其中N、P、K三种元素在笋中的含量最大。根据合江方竹营养器官养分分析计算其对氮磷钾的需求量分别是:N 175.78 kg/hm^2,P_2O_513.36 kg/hm^2,K_2O 112.07 kg/hm^2。

The height growth process of Chimonobambusa hejiangensis was observed in Chishui City of Guizhou Province from September to November in 2015. The observed results were clustered by Fisher method. The height growth process of Ch. hejiangensis was divided into the initial period, peak period and end period. The peak period lasted for 28 days with a mean growth of 23.4cm/day, and this period accounted for 85.6% of total height growth. The height growth of Ch. he- jiangensis did not show much difference between the daytime and the nighttime. The fastest height growth was at 2：00 am and the lowest height growth was at 14：00 pm and 4：00 am. Nutrient elements in various organs of Ch. hefiangensis were analyzed. The results showed that the contents of the same element were different in different organs. The nitrogen （N） contents in different organs were in the order of： shoot〉leaf〉sheath〉branch〉stem, while for Phosphorus （P） and Potassi- um （K） the order was： shoot〉sheath〉leaf〉branch〉stem, indicating that the contents of the three nutrition elements （N, P, K） were highest in shoot. Based on the analysis of nutrient elements in different organs, the fertilizer requirements of Ch. hefiangensis for N, P and K were calculated as： N 175.78 kg · hm^-2, P205 13.36 kg ·hm^-2, and K20 112.07 kg · hm^-2 , respectively