长兴县合溪水库库区3种主要苗木配方施肥增效研究

库区内农业种植施肥策略直接影响流域土地资源利用和生态保护成效。以长县县合溪水库库区为例,选择库区内香樟、银杏和榉树等3种主要种植苗木为田间试验对象,对比分析不同土壤肥量策略(常规施肥、测土配方施肥、测土配方施肥+套种绿肥)与苗木生长和需肥的关系。结果表明,测土配方施肥处理土壤碱解氮含量略高于常规施肥处理,但明显提高了土壤速效磷和速效钾含量。测土配方施肥和测土配方施肥+套种绿肥处理没有明显增加土壤碱解氮含量,有利于减少土壤氮素流失,但增加了土壤速效磷和速效钾含量。测土配方施肥和测土配方施肥+套种绿肥处理对于苗木茎粗、新梢粗度和新梢长度都有一定的促进作用,能提高苗木的生长速度,且差异显著。

Efficiency of Three Main Seedlings Fertilization in Hexi Reservoir Area of Changxing County

The agricultural planting and fertilization strategies in the reservoir area directly affect the usage of land resources and effectiveness of ecological protection in the river basin.Taking the Hexi Reservoir Area of Chang County as an example, this paper analyzed three main planting seedlings (Cinnamomum camphora (L.) PresL, Ginkgo bilob a Linn., and Zelkova serrata (Thunb.) Makino) growth status andits demand for fertilizer under the three treatment of different fertility strategies (conventional fertilization, soil testing and fertilization, and soil testing and fertilization + interplanting green manure). The results showed that the soil alkaline nitrogen content was slightly higher than that of conventional fertilization treatment, but the soil available phosphorus and available potassium were significantly increased.Soil testing and fertilization and soil testing and fertilization + interplanting green manure treatment did not significantly increase soil alkali nitrogen content, which was beneficial to reduce soil nitrogen loss, but increased the content of soil available phosphorus and available potassium. The soil testing formula fertilization and soil testing formula fertilization + interplanting green manure treatment can promote the seedling stem diameter, new shoot thickness, and new shoot length. Both of them can significantly increase the growth rate of seedlings.