水氮耦合效应对三倍体毛白杨林木生长状况的影响  

Coupling Effect of Water and Nitrogen Fertilizer on Growth of Established Triploid Populus tomentosa

作　　者：孙兆地[1] 聂立水[1] 辛颖[2] 罗盼盼[1] 任忠秀[1] 韦丹[1] 李吉跃[2,3] 沈应柏[4] 张志毅[4] 

机构地区：[1]北京林业大学水土保持与荒漠化防治教育部重点实验室,北京100083 [2]北京林业大学省部共建森林培育与保护教育部重点实验室,100083 [3]华南农业大学林学院,广东广州510642 [4]北京林业大学林木育种国家工程实验室,林木花卉遗传与育种教育部重点实验室,北京100083

出　　处：《土壤通报》2012年第4期896-902,共7页Chinese Journal of Soil Science

基　　金："十一五"国家科技支撑计划课题(2006BAD24B04)资助

摘　　要：为了研究水氮耦合效应对三倍体毛白杨林木生长状况的影响和机理,筛选有利于毛白杨生长的最佳水氮组合,于2008年在河北省邢台市威县采用不同水氮组合的随机区组设计对BT17三倍体毛白杨的生长状况进行连续二年研究。结果表明:不同生长时期,BT17三倍体毛白杨胸径和树高生长量快慢为:7月>6月>5月>8月>9月;方差分析结果表明,不同水氮处理间毛白杨生长指标差异显著,其中当土壤含水量为田间持水量的75%、施氮肥量(纯氮量)为240 g株-1时,胸径和树高的增长量最大,分别达到2.83±0.14 cm、3.40±0.31 cm。根据不同的施肥小区计算毛白杨林木的材积生长量,肥料和灌溉费用,计算出不同处理的经济效益,处理W3N3的经济效益最大,超过对照处理W1N0的两倍,每公顷纯利润高出两万多元。研究为毛白杨合理施肥和速生丰产林培育提供科学依据。The aim of this work is to present the water-nitrogen coupling effect on the growth and economic benefits of established trees of Populus tomentosa clones BT17. In this research, a field test employing randomized block design with soil water content as main treatment and application rate of nitrogen as sub-treatment had been carried on for two years in a Populus tomentosa tree plantation in Weixian of Hebei Province. The results were as follows. The growth rate of diameter at breast height （DBH） and the growth rate of height identically ordered as July 〉 June 〉 May 〉 August 〉 September. Variance analysis indicated that there were significant differences among various water and nitrogen treatments on DBH and height. Increment of DBH and height were highest when the soil water content was between 75% - 100% of field capacity and nitrogen application was 240 g per plant, at 2.83±0.14 cm and 3.40±0.31 cm, respectively. By taking into account of increment of stand volumes, cost of fertilization and irrigation economic benefit analysis showed that the W3N3 treatment had the highest pure profit with over twenty thousand RMB per ha. Our results may provide scientific reference for sound fertilization of established trees and fast growing and high yielding plantation cultivation practice.

关 键 词：毛白杨林木 水、氮耦合 经济效益 速生丰产林 合理施肥 

分 类 号：S154.2[农业科学—土壤学]