Luo Jun, Que Youxiong, Zhang Hua, Xu Liping
Key Laboratory of Sugarcane Biology and Genetic Breeding, Ministry of Agriculture and Fujian Agriculture and Forestry University, Fuzhou 350002, China.
ScientificWorldJournal. 2013 Dec 26;2013:801486. doi: 10.1155/2013/801486. eCollection 2013.
Population structure determines sugarcane yield, of which canopy structure is a key component. To fully understand the relations between sugarcane yield and parameters of the canopy structure, 17 sugarcane varieties were investigated at five growth stages. The results indicated that there were significant differences between characterized parameters among sugarcane populations at different growth stages. During sugarcane growth after planting, leaf area index (LAI) and leaf distribution (LD) increased, while transmission coefficient for diffuse radiation (TD), mean foliage inclination angle (MFIA), transmission coefficient for solar beam radiation penetration (TR), and extinction coefficient (K) decreased. Significant negative correlations were found between sugarcane yield and MFIA, TD, TR, and K at the early elongation stage, while a significant positive correlation between sugarcane yield and LD was found at the same stage. A regression for sugarcane yield, with relative error of yield fitting less than 10%, was successfully established: sugarcane yield = 2380.12 + 46.25 × LD - 491.82 × LAI + 1.36 × MFIA + 614.91 × TD - 1908.05 × TR - 182.53 × K + 1281.75 × LD - 1.35 × MFIA + 831.2 × TR - 407.8 × K + 8.21 × MFIA - 834.50 × TD - 1695.49 × K (R (2) = 0.94**).
群体结构决定甘蔗产量，其中冠层结构是关键组成部分。为全面了解甘蔗产量与冠层结构参数之间的关系，在五个生长阶段对17个甘蔗品种进行了调查。结果表明，不同生长阶段甘蔗群体的特征参数存在显著差异。在甘蔗种植后的生长过程中，叶面积指数（LAI）和叶分布（LD）增加，而漫射辐射透过系数（TD）、平均叶倾角（MFIA）、直射辐射穿透透过系数（TR）和消光系数（K）降低。在伸长初期，甘蔗产量与MFIA、TD、TR和K之间存在显著负相关，而在同一阶段甘蔗产量与LD之间存在显著正相关。成功建立了甘蔗产量回归方程，产量拟合相对误差小于10%：甘蔗产量 = 2380.12 + 46.25×LD - 491.82×LAI + 1.36×MFIA + 614.91×TD - 1908.05×TR - 182.53×K + 1281.75×LD - 1.35×MFIA + 831.2×TR - 407.8×K + 8.21×MFIA - 834.50×TD - 1695.49×K（R (2) = 0.94**）
