摘要
采用田间小区试验,在施用一定量磷钾的基础上,研究不同氮用量对江汉平原杨树的生长及材积量的影响。研究表明:杨树每株施用纯氮100g,材积量每hm^2比对照多增2.84m^3,增产率66.98％,差异达极显著水平;每株杨树施用氮素100g比施用氮素50g,材积量每hm^2多增1.16m^3,多增产19.59％;株施氮素100g比不施用氪素每hm^2净增收入624元,投产比1.00:2.74。综合分析,江汉平原杨树每株施用氮素100g为宜。
On the basis of applicating a certain amount of phosphate and potassium, influence on growth and volume amount of poplar in Jianghan plain by different nitrogen usages was studied by use of field plot test, it was indicated that 100 g of pure nitrogen is applicated to every plant of poplar and compared with forest, more than 2.84 m^3 of volume amount has been increased per hm^2, that is, 66.98% of production increment rate has been realized and at the same time, very significance has been reached in difference between them; more than 1.16 m^3 of volume amount has been increased per hm^2 by applicating 100 g of nitrogen to each plant of poplar relative to 50 g of nitrogen application, i.e. 19.59% of productive increment; 624 Yuan of net income has been increased per hm^2 when applicating 100 g of nitrogen to each plant relative to no nitrogen application, the input—output ratio is 1.00: 2.74. The suitable nitrogen application is 100 g for each plant of poplar in Jianghan plain according to comprehensive analysis.
出处
《湖北林业科技》
2004年第C00期54-56,共3页
Hubei Forestry Science and Technology
关键词
杨树
氮肥
施用量
材积量
胸径
生长
poplar
nitrogen
volume amount
breast diameter
benefit
