杉木种子涩籽的空间特征分析

杉木为我国南方山地主要造林树种,其分布范围广,造林种子需求量大,而涩籽是造成其种子发芽率低的重要原因之一。杉木不同分布区,山地环境条件差异较大,杉木种子涩籽的空间差异也较大。采用空间自相关、空间关联和分形理论等方法对福建省杉木种子涩籽的空间特征进行了分析,结果表明杉木种子涩籽空间异质性较大,其自相关系数和半方差函数变化与空间尺度密切相关;地理位置是影响杉木种子涩籽的重要因素之一,在杉木种子园的建立及种子调拨过程中应考虑杉木种子涩籽空间特征。

Analysis on Spatial Characteristics of Sterile Seeds of Cunninghamia lanceolata

Cunninghamia lanceolatais the main planted tree in mountains areas of southern in China,and because Cunninghamia lanceolataforests are widely distributed in 16 provinces of southern China,the seed need is very big for plantation.But sterile seed of Cunninghamia lanceolatais an important reason for its lower germination rate,the spatial heterogeneity of sterile seeds of Cunninghamia lanceolatais significantaffected by environmental conditions in different distributed area.The spatial statistics methods,such as spatial autocorrelation,spatial association and fractal dimension etc.were applied to study the spatial distribution characteristics of sterile seeds of Cunninghamia lanceolatain Fujian province in this paper.The results show that the heterogeneity of sterile seeds of Cunninghamia lanceolatais obvious and is correlated with spatial scale,i.e.the spatial autocorrelations being positive in small scale,negativein large-scale,and the sem-variance tends to increase with increasing of spatial scale.Theare many factors affecting the spatial characteristics of sterileseeds of Cunninghamia lanceolata,but geographical location is an important factor affecting seeds quality,because longitude and latitude strongly influence the quantity of heating and water distribution.So,spatial characteristics of sterile seeds of Cunninghamia lanceolata must be considered when establishing seed orchard and allottingseed of Cunninghamia lanceolata.