毛竹笋快速生长过程中冠层参数动态及其与光合有效辐射的关系

摘要

The dynamic change of moso bamboo (Phyllostachys edulis) canopy parameters, including total chlorophyll content (TCC) , leaf area index (LAI), canopy closure (CC) during the bamboo shooting growth phase was examined, and the relationships between these canopy parameters and photosynthetic active radiation (PAR) were analyzed. Results showed (1) increases in TCC, LAI, and CC during the bamboo shooting growth phase; (2) that the relationship between a mother bamboo's TCC and PAR in the prior leaf development stage (R = 0.570, P = 0.180) was higher than in the posterior leaf development (R = 0.140, P = 0.860); and (3) after leaf development, PAR had a positive correlation with LAI (R2 = 0.796 0, P = 0.120) and a significantly positive correlation with CC (R2 = 0.991 6, P = 0.004). This result implied that the priority for delivering photosynthetic products from the mother bamboo was to shoot before leaf development. The correlation analysis showed that the Phyllostachys edulis canopy enhanced solar energy allocation and utility. [Ch, 6rnfig. 24ref.]%基于冠层参数连续监测,研究了毛竹Phyllostachys edulis笋快速生长过程中冠层参数动态,并分2个阶段分析了叶绿素质量、叶面积指数和冠层郁闭度与冠层上方光合有效辐射的关系.结果表明:①单位面积叶绿素质量、叶面积指数和冠层郁闭度值在毛竹笋快速生长过程中呈增长趋势,相应增量分别为5.5 μg· cm-2,1.0和0.6；②放叶前母竹叶绿素与光合有效辐射的相关性高于展枝放叶后两者的相关性,相关系数由0.57(P=0.180)降为0.14(P=0.860),在一定程度上反映了放叶前母竹为竹笋快速生长提供更多的光合产物；③在新竹放叶过程中,叶面积指数和冠层郁闭度与光合有效辐射的关系呈正相关,复相关系数分别为0.796 0(P=0.120)和0.9916 (P=0.004),说明在这一阶段毛竹林冠层对光能的利用和分配增强.