杉木大田育苗密度控制检测卡的研制与应用

通过收集三明市１１个国营苗圃１年生杉木大田实生苗样方２８５个，样苗４９８６株。实测地径（Ｄｏ）、苗高（Ｈ）、密度（即单位面积株数Ｎ），统计合格苗率（Ｐ）、二级苗率（Ｐ１），计算高径比值（ρ）共６个指标。用２５ｃｍ、３０ｃｍ、３５ｃｍ、４０ｃｍ、４５ｃｍ、５０ｃｍ６个不同高度级建立线性回归模型；用异速生长模型ｙ＝ｋｘｍ确定苗高与线性回归模型参数之间的关系，从而得到地径与苗高、密度之间的关系：Ｄｏ＝０．０３８８０６１７１７Ｈ０．７８８０４３３３９５－０．０００００１６５６１Ｈ１．６７０１８７９２８Ｎ；高径比与苗高、密度之间的关系：ρ＝２５．７６９０９６９３Ｈ０．２１１９５６６６０５（１－０．００００４２６７６２Ｈ０．９９２１４４５８８５Ｎ）－１；合格苗率与苗高、密度的关系：Ｐ＝１７１．４７９５５８９－１００５．２７３０５９Ｈ－０．７８８０４３３３９５（１－０．００００４２６２３５Ｈ０．９９２１４４５８８５Ｎ）－１；Ⅰ级苗率与苗高、密度之间的关系：Ｐ１＝２０８．７３１５７９９－１８１６．５６５１４８Ｈ０．７８８０４３３３９５（１－０．００００４２６７６２Ｈ０．９９２１４４５８８５Ｎ）－１．根据以上模型研究杉木大田?

Preparation and Application of the Check Card of Field Seedling-Raising Density Control of Cunninghamia lanceolata

sample seedlings of Cunninghamia lanceolata at the age of one in fields were collected in 11state-owned nurseries in Sanming City by means of the surveys for two years。The ground diameter, heightand density of the seedlings were really measured,the certified seedling rate and the first-grade seedling ratewere counted and six indexes of height-diameter ratio,etc。were calculated.According to four models.theeffective methods of field seedling-raising density and quality control of C.lanceolata were studied and thedensity control check card was prepared.The precision of table compilation of four models reached over 97%and in the light of the check of survey data of Fujian Province the really measured precision reached above90%。