磷肥对马尾松低产林幼林生长的影响.PDF

中国农学通报 2016,32(4):5-8 Chinese Agricultural Science Bulletin 磷肥对马尾松低产林幼林生长的影响 1 2 1 1 赵敏冲 ，赵 华 ，刘建忠 ，宋传生 1 2 （贵州省林业调查规划院，贵阳550003 ；贵州省林业厅，贵阳550003） 摘 要：笔者通过对5 年生的马尾松低产林幼林进行施氮肥试验，试图研究马尾松低产林幼林生长量与 磷肥施肥量之间的回归关系。结果表明：马尾松低产林幼林生长量与磷肥施肥量之间的关系符合一元 二次抛物线方程，反应曲线为典型凸形曲线，即生长量各指标均存在1 个峰值。峰值以前，生长量各指 标随着磷肥施肥量的增加而上升；峰值以后，生长量各指标随着磷肥施肥量的增加而下降。根据回归模 型方程式求解，得到树高、胸径生长量最大时对应的磷肥施肥量均为0.11 kg ，对应的最高理论树高、胸 径分别为2.6 m 、4.87 cm ，分别较对照提高了36.84% 、10.93%。 关键词：马尾松；低产林改造；磷肥；最佳施肥量 中图分类号：S725.5 文献标志码：A 论文编号：cas EffectsofPFertilizeronGrowthofLow-yieldandYoungPinusmassoniana 1 2 1 1 ZhaoMinchong,ZhaoHua,LiuJianzhong,SongChuansheng 1 (GuizhouForestrySurveyandPlanningInstitute,Guiyang550003; 2TheForestryDepartmentofGuizhouProvince,Guiyang550003) Abstract: Torevealtheregressionrelationship betweenthesaplingincrementandtherateofPfertilizer application,anexperimentofPfertilizer application wasconductedin a 5-yearslow-yieldyoung Pinus massoniana forest. The results showed that there was a parabolic trend equation which could efficiently representtherelationshipbetweentheincrementandtheapplicationamount, thereactioncurvewas atypical convexcurveand reflected onepeak in eachindexofincrement.Eachindexofincrementrosewiththe increaseofPfertilizer application amountbeforethe peak,andturnedto decrease withthe increase ofP fertilizerapplicationafterthepeak.Accordingtotheresults, 0.11kgPfertilizerpertree shouldbeappliedto treeswhen