水氮耦合下毛白杨无性系材积生长规律及品种选择  

Stem volume current annual growth rhythm of four Populus tomentosa clones under water-nitrogen coupling and variety selection

作　　者：任忠秀[1] 聂立水[1] 张强[1] 辛颖[1] 宋莲君 罗盼盼[1] 

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]河北省威县苗圃场,河北威县054700

出　　处：《中南林业科技大学学报》2011年第8期187-193,共7页Journal of Central South University of Forestry & Technology

基　　金："十一五"国家科技支撑计划课题:"杨树速生丰产林培育关键技术研究与示范"(2006BAD24B04)

摘　　要：在河北省威县进行BT17、B331、S86、1316四个三倍体毛白杨无性系的大田水氮耦合试验,研究了水氮耦合效应对造林第2年、造林第4年的4个毛白杨无性系材积连年生长量的影响,并分别建立了数学模型。研究分析表明:水、氮对4个毛白杨无性系连年材积生长量存在耦合交互作用,且水氮的交互作用为正相关。不同的水氮配合有不同的连年材积生长量,在试验设计范围内,材积连年生长量与水分的增加和施氮量的增加呈正比。水、氮及水氮交互作用对造林第2年、造林第4年的4个毛白杨无性系材积连年生长量的影响效力分别为:水分>氮肥>水氮交互,氮肥>水分>水氮交互。可见,造林初期,应加强林地水分管理,后期应加强林地肥料管理。为达到最大材积连年生长量,造林第2年BT17、B331、S86、1316四个毛白杨无性系的最佳氮肥施用量为0.373 1、0.399 20、.432 70、.342 5 t/hm2,最佳土壤水分含量分别保持在田间持水量的74.93%、76.44%、77.74%、76.72%。造林第4年的最佳氮肥施用量为0.419 80、.455 1、0.480 8、0.367 4 t/hm2,最佳土壤水分含量分别保持在田间持水量的80.71%、83.47%、85.56%、78.42%。BT17、B331、S86、1316四个毛白杨无性系的抗旱能力与生长速率存在显著差异,其大小顺序为S86>B331>BT17>1316。Through the experiments of water-nitrogen coupling for Populus tomentosa plantation in Weixian county Hebei province, the influences of water and nitrogen on the stem volume current annual increments of Populus tomentosa clones （BT17, B331, S86, 1316） in the second year and fourth year of forestation were investigated and a mathematical model was established. The main results were as follows： the coupling and alternating effects of ni- trogen and water to the stem volume current annual increments of four Populus tomentosa clones existed, and the interaction effects of water and nitrogen were positive correlatiorL The different conditions of water and nitrogen produced the different stem volume current annual increments. The stem volume current annual increments of four Populus tomentosa clones increased gradually with the increases of application amount of nitrogen and soil water content within the limits of experimental scheme. The effects of water, nitrogen and the interactive effects of water and nitrogen on the stem volume current annual increments of four Populus tomentosa clones in the second year of forestation were water 〉 nitrogen 〉 the interactive effect of water and nitrogen. The effects of water, nitrogenand the interactive effect of water and nitrogen on the stem volume current annual increments of four Populus tomenrosa clones in the fourth year of forestation were nitrogen 〉 water〉 the interactive effect of water and nitrogen. For stem volume current annual increments of four Populus tomentosa clones （BT17, B331, 2N36, 1316） in the sec= ond year of forestation, the optimum application rates of nitrogen were 0. 373 1, 0. 399 2, 0. 432 7, 0. 342 5 t ·hm^-2 respectively, and the optimum soil relative water contents were 74.93%, 76.44% ,77.74% %76.72% of field capacity respectively. For stem volume current annual increments of four Populus tomentosa clones（BT17, B331, S86, 1316） in the fourth year of forestation, the optimum application rates of nitrogen were 0. 419 8, 0. 455 l,

关 键 词：毛白杨无性系 水氮耦合 材积连年生长量 最佳水氮组合 

分 类 号：S792.117[农业科学—林木遗传育种]