地下滴灌条件下杨树速生丰产林林木根系生长特性  

Characteristics of root growth in fast-growing and high-yield poplar plantations under subsurface drip irrigation.

作　　者：韦艳葵[1] 贾黎明[1] 王玲[1] 邱国庆 邢长山[3] 

机构地区：[1]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 [2]北京市顺义区林业局 [3]北京市共青林场

出　　处：《北京林业大学学报》2007年第2期34-40,共7页Journal of Beijing Forestry University

基　　金：教育部博士点基金资助项目;北京市林业局重点项目"渗灌用于沙地杨树速生丰产栽培的初步研究"

摘　　要：在北京潮白河沙地意大利214杨人工林中，对地下滴灌和常规灌溉下林木根系生长特点进行了研究．结果表明：地下滴灌能使林木〈10mm根量（尤其是〈2mm细根量）大幅度增加，如地表以下20-50cm土层地下滴灌区〈10mm根量大于常规灌溉的3倍，这是林地生产力提高的重要原因之一．从垂直分布来看，地下滴灌林木〈10mm根集中分布在20-50cm，常规灌溉林木基本呈均匀分布状态；从水平分布来看，地下滴灌林木〈10mill根主要分布在靠近地下滴灌管的地方，行间3m处〈10mm总根量甚至比常规灌溉还减少了50％．因此建议在树体增大后，在行间、株间中线上布设“井”字形地下滴管，以扩大地下滴灌（SDI）区根系分布和吸收范围．讲一痔根高林地生产力．The characteristics of root growth in the fast-growing and high-yield plantations of I-214 （Populus cv. ＇I-214＇） poplar under subsurface drip irrigation（SDI） and normal irrigation（NI） on sandy soil of Chaobai River in Beijing were studied. It is better to further research the fast-growing and high-yield mechanism of trees under SDI. The results showed that, compared with NI, there was a big increase in the amount of roots（ d 〈 10 mm） （especially that of roots（ d 〈 2mm）） under SDI, such as the amount of roots（ d 〈 10 mm） under SDI was three times more than that under NI in the soil layer of 20-50 cm. It is one of the important reasons of increasing the productivity of the plantation increased. The absorbing roots under SDI were concentrated in the soil layer of 20-50 cm, while the roots under NI were distributed in each layer evenly. As roots （ d 〈 10 mm） distributed in level, those under SDI distributed mainly near the droppers and the amount of roots in 3 m in row under SDI was 50 % less than that under NI. So it is suggested that droppers having the shape of ＂ # ＂ should be collocated in the middle of two rows and two individual trees in order to increase the distributing and absorbing range of root under SDI, and further increase the plantation productivity.

关 键 词：杨树 速生丰产林 地下滴灌 根系 

分 类 号：S792.11[农业科学—林木遗传育种] S727.1[农业科学—林学]