吊丝单竹笋期叶片特性研究

对3种不同年龄的吊丝单竹株在不同发笋时期、不同竹冠部位的叶片比叶重、光合、呼吸性状及N、P、K含量等进行测定,结果表明:吊丝单竹在不同发笋时期、不同竹冠部位各项指标均有较大差异。比叶重发笋盛期高于初期和末期,随着竹株年龄增大而减小,随着竹冠的升高而增大;净光合速率盛期高于初期,光呼吸速率和暗呼吸速率则初期高于盛期,并且不同竹龄、不同竹冠部位之间均表现出较大的差异;N、P、K含量由发笋初期至盛期逐渐减小,N含量以1a>2a>3a,以竹冠中部最高,P、K含量则随着竹冠的升高而减小,随着竹株年龄的增大而增大。这为经营管理吊丝单竹林提供科学依据。

Some Physiological Characteristics of the Leaves of Dendrocalamopsis vario-striata during Shooting

Specific leaf weight, photosynthetic rate, photorespiration rate, as well as N, P, K contents were measured in the leaves of Dendrocalamopsis vario-striata grown in Chishan Forest Farm in Fujian Province during shoot development. Results indicated that specific leaf weight (SLW) was higher at shoot abundant stage (in mid July) than that at early stage (on 12, June) and late stage (on 10, September). SLW decreased as the bamboo age increased, and increased with the ascending levels of leaf location on bamboo stems. Net photosynthetic rate at shoot abundant stage was higher than that at early stage, whereas photorespiration rate and dark respiration rate were higher at early stage. The contents of N, P and K in bamboo leaves decreased gradually during shooting period. N content in leaves was in the order of 1-year-old >2-year-old >3-year-old bamboo, and being the highest in leaves on mid part of bamboo stems, whereas the contents of P and K decreased with the ascending levels of leaves on stems, and increased with the increase of the bamboo age. The results would provide guidance for scientific management of D. vario-striata planting.