摘要:
为研究水氮耦合效应对毛白杨无性系人工林林分蓄积量与经济效益的影响，在河北省威县苗圃场选择4个毛白杨无性系1316、BT17、B331、S86人工林林分，采用裂区设计进行了连续4年田间试验研究。结果表明：水氮对4个毛白杨无性系林分蓄积量与经济效益有显著影响，各因素对林分蓄积量影响的次序为：水氮水氮交互，其中水、氮存在正交互作用。经模型寻优得出4个毛白杨无性系1316、BT17、B331、S86的水氮最佳经济效益组合：当施氮量分别为380 kg/hm2（300 g/株）、457 kg/hm2（360 g/株）、472 kg/hm2（371 g/株）、508 kg/hm2（400 g/株），土壤水分分别控制在田间持水量的76.92%、80.10%、81.46%、84.86%时，林分蓄积量分别达86.33、149.92、163.45、200.28 m3/hm2；相应的纯收入分别为32 866、69 519、77 418、98 630 元/hm2，分别比对照（W1N0）的纯收入增加了69.87%、82.82%、80.15%、81.45%。每公顷无性系S86的林分蓄积量分别是无性系1316的2.3倍、BT17的1.3倍、B331的1.2倍。每公顷无性系S86的纯收入分别是无性系1316的2.9倍、BT17的1.4倍、B331的1.3倍。可见S86在高水氮条件下为该地区最速生、丰产的毛白杨无性系。
Abstract:
The aim of this work was to present the waternitrogen coupling effects on stand volume and economic benefit of Populus tomentosa clone plantations. Field experiment with split plot design consisted of four P. tomentosa clones (1316, BT17, B331, S86) had been conducted for four years in Weixian County Nursery of Hebei Province, northern China. The main results were as the followings: the coupling effects of water and nitrogen on both the stand volume and economic benefit of established trees of four P. tomentosa clones were significant.Water was main factor affecting the stand volume, followed by nitrogen, and then the interaction of nitrogen and water of which were positive. Four optimized mathematical models were established and it showed that the optimal combination of water and nitrogen for clone 1316 was 76.92% of field capacity, 380 kg/hm2（300 g/plant）of nitrogen, under which the stand volume would reach 86.33 m3/hm2; that for clone BT17 was 80.10% of field capacity, 457 kg/hm2（360 g/plant）of nitrogen, stand volume would reach 149.92 m3/hm2; that for clone B331 was 81.46% of field capacity, 472 kg/hm2（371 g/plant）of nitrogen, stand volume would reach 16345 m3/hm2, and the optimal combination for clone S86 was 84.86% of field capacity, 508 kg/hm2（400 g/plant）of nitrogen, the stand volume would reach 200.28 m3/hm2 The net profit under the optimal combinations of water and nitrogen of four P. tomentosa clones (1316, BT17, B331, S86) reached 32 866, 69 519, 77 418 and 98 630 RMB/hm2, respectively, and was 69.87%, 82.82%, 80.15%, 81.45% higher than that of control (W1N0). The stand volume per hectare of clone S86 was 2.3 times of clone 1316, 1.3 times of BT17 and 1.2 times of B331 The net profit per hectare of S86 was 2.9 times of clone 1316, 1.4 times of BT17，and 1.3 times of B331 respectively. Therefore, under high water and nitrogen conditions，clone S86 is the fastestgrowing and highest-yielding clone of this region.
百度学术
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