南方红豆杉冠层光辐射分布及其对单枝结实量的影响

Canopy light distribution and its influence on single branch fruit quantities in Taxus chinensis var. mairei

选择2株育龄南方红豆杉雌性植株,采用树冠分层分方位研究法,测定了东西南北4个方位及其内外两层计8个小区的光辐射量和单枝结实量,分析探讨了冠层光辐射、单枝结实量的分布格局及其相关性,结果表明:南方红豆杉外层与内层相对光辐射量存在极显著差异(P<0.01),不同方位间受周边生境的影响,东南方位光照充足,与西北方位存在极显著差异(P<0.01);南方红豆杉冠层单枝结实量与冠层相对光辐射量的空间分布特征存在类似的规律性,相关分析表明,二者呈正相关的(y=0.105x-0.5775,R2=0.988),冠外层单枝结实量极显著高于冠内层单枝结实量(P<0.01),冠东方位的单枝结实量与其他方位存在极显著差异(P<0.01)。

Two female plant of Taxus chinensis var.mairei in bearing age were chosen,light radiation and single branch fruit quantities with stratification and dividing position method in the canopy were used, light radiation and single branch fruit distributive patterns and correlativity in the canopy were analzed and approached.Result showed that Taxus chinensis var.mairei outer relative light radiation were extremely significant higher than inner's((P<0.01)).Different position was influenced by environment, there were good illumination in east and worth position, and that were extremely significant different than west and north position(P<0.01).Distribution characteristic of single branch fruit quantities had similar regular pattern to be compared with distribution characteristic of light radiation,correlative analyze result showed positive correlatively(y=0.105x-0.5775,R^2=0.988),Single branch fruit quantities in outer canopy were extremely significant higher than inner's(P<0.01),single branch fruit quantities in east position of canopy were extremely significant different than other's(P<0.01).