农田防护林网内农作物增产机制的初步研究

• 作 者: 毕广有 俞冬兴
• 机 构: 黑龙江省防护林研究所,黑龙江省防护林研究所
• 出 处: 防护林科技
• 发表日期: 1988年00期
• 关键词: 农作物 农田防护林 美国白杨 增产效益 黑杨 苜蓿 牧草 对照区 防护林体系 蒸发量

一、前言 对于林带庇护下的农作物的增产效果,国内外都进行了大量研究。在国外,如美国测定了在美国白杨×黑杨林带影响区(树高20倍以内)苜蓿产量比对照区高3.5公担/公顷;苏联研究出,若林带面积占整个农田2～5％,同无林带相比粮食可增产25％,还有日本等国也都进行了林带保护下的牧草、农作物等的增产效益的研究。但是,林带保护

I. Preface Much research has been done both at home and abroad on the yield-increasing effect of crops sheltered under shelterbelts. Abroad, such as the United States measured in the United States × Poplar × Black Poplar Belt affected area (tree height 20 times less) alfalfa yield 3.5 kg / ha higher than the control area; the Soviet Union studied, if the forest area accounts for 2 to 5% of the entire farmland, Compared with the forest belt can increase grain yield 25%, as well as Japan and other countries have also carried out under the protection of pasture, crop yield and other benefits of research. However, the belt is protected