袋控施肥对杉木生长及土壤养分的影响

通过3 a的杉木施肥试验,研究了不同施肥方式对杉木树高、胸径和蓄积量以及土壤pH值、有机质和土壤养分含量的影响。结果表明:3 a试验后,最佳处理为A处理(6孔袋控处理),树高(8.46 m)、胸径(8.96 cm)和蓄积量(98.16 m~3·hm~(-2)),分别比CK提高5.75%、降低0.56%、提高19.13%,分别比B(8孔袋控处理)、C(10孔袋控处理)、D(传统处理)处理的提高0.24%~5.75%、2.63%~5.78%和17.75%~18.71%。0~20 cm和20~40 cm的土层土壤pH值均以A处理最高(4.6),0~20 cm土层的土壤有机质含量以B处理最高(37.77 g·kg~(-1)),A处理的土壤有机质含量与B处理相差不大,20~40 cm土层的土壤有机质含量以A处理最高(25.75 g·kg~(-1))。施肥3 a后,土壤全氮、全磷、全钾、碱解氮和速效钾含量总体上以A处理最高。各处理0~20 cm土层的速效钾含量较试验前降低,全氮、全磷、全钾和碱解氮在0~20 cm和20~40 cm土层的含量均比试验前增加。相比常规施肥,袋控施肥对提高杉木早期生长量和林地土壤肥力上的效果较好,其中又以A处理效果最好。

Effects of bagging fertilization on plant growth and soil nutrient in Cunninghamia lanceolata plantation

In order to improve the growth of Cunninghamia lanceolata,fertilization experiment of the plantation were conducted for 3 years.The effects of different fertilization methods on the growth of height,diameter at breast height,volume of C.lanceolata and soil pH,organic matter and soil nutrient content were studied.Results showed:3 a after the test,A treatment (6 hole bag) was the best treatment with the tree height 8.46 m,diameter at breast height 8.96 cm and volume growth 98.16 m3·hm-2 which was 5.75％,-0.56％,19.13％ higher than that of CK respectively,0.24％～5.75％,2.63％～5.78％ and 17.75％～18.71％ higher than that of other fertilization treatment.The soil pH value at 0～20 cm and 20～40 cm layer were the highest in A treatment (4.6),Soil organic matter content at 0～20 cm soil layer was the highest in B treatment (37.77 g·kg-1),the content of soil organic matter in A treatment was the similar with B treatments,soil organic matter content at 20～40 cm soil layer was the highest in A treatment (25.75 g·kg-1).Mter 3 a fertilization,total nitrogen,total phosphorus,total potassium,available nitrogen and available potassium were higher in A treated soil.The content of available potassium in each treatment at 0～ 20 cm soil layer was lower than before the experiment and total nitrogen,total phosphorus,total potassium and available nitrogen in the soil of 0～20 cm and 20～40 cm soil layers were higher than before the experiment.Therefore,compared to conventional fertilization,the effect of bag controlled fertilization on the growth of C.lanceolata and the soil fertility of forest land was better and the A treatment is the best.