不同氮素形态肥料对油茶春梢生长的影响

为了给油茶林合理施肥管理提供科学依据,本研究以13 a生"岑软3号"油茶(Camellia oleifera)树为研究对象,以不施肥作为空白对照,以不加氮肥作为无氮对照,研究相同施氮量下硝态氮肥、铵态氮肥、酰胺态氮肥以及3种形态氮素1:1:1混合态氮肥对油茶春梢形态及生理的影响.结果显示,与空白对照相比,混合态氮对春梢...

Effects of Different Nitrogen Form Fertilizers on Spring Shoot Growth of Camellia oleifera

In order to provide a scientific basis for the rational fertilization management of Camellia oleifera forest, the 13-year-old "Cenruan No.3" C.oleifera tree were taken as the research objects, and no fertilization was used as the blank control and no nitrogen fertilizer was used as the non-nitrogen control.The effects of nitrate nitrogen fertilizer, ammonium nitrogen fertilizer, amide nitrogen fertilizer and three forms of nitrogen fertilizer (1:1:1) on the morphology and physiology of spring shoots of C.oleifera under the same nitrogen application rate were studied.The results showed that compared with the blank control, the mixed nitrogen had the largest increase in the number, length and diameter of spring shoots by 33.74%, 71.97% and 27.86%, respectively.Mixed nitrogen and nitrate nitrogen significantly increased the accumulation of total nitrogen, among them, total nitrogen increased by 60.58% and 53.49%, total phosphorus increased by 26.60% and 37.23%, total potassium increased by 34.31% and 42.80%, respectively.Mixed nitrogen and nitrate nitrogen increased the main organic matter of spring shoots significantly, with soluble sugar increased by 17.66% and 17.90% respectively, and soluble protein increased by 10.74% and 7.96% respectively.Nitrogen fertilizer could significantly increase the enzyme activity of C.oleifera leaves, and the increase of mixed nitrogen was the largest.The activities of SOD, POD and CAT increased by 26.78%, 209.26% and 30.09% respectively compared with the control.The application of nitrogen fertilizer could also improve the utilization efficiency and photosynthetic rate of C.oleifera under weak light, among which the effect of mixed nitrogen was the most obvious.The above results show that the application of nitrogen fertilizer before spring shoot germination of C.oleifera can promote the growth of spring shoots.Under the same nitrogen content, the effect of different forms of nitrogen fertilizer on the growth of C.oleifera spring shoots is as follows:Mixed nitrogen fertilizer>nitrate nitrogen fertilizer>ammonium nitrogen fertilizer>amide nitrogen fertilizer.