低覆盖度行带式种植模式下赤峰杨根系分布特征  

Root Distribution of Populus × xiaozhuanica cv.‘Chifengensis' Planted Under Low Coverage Belt-scheme

作　　者：吴雪琼[1,2] 杨文斌[2] 李卫[2] 乌志颜 张丽 王红霞 李向晨 陈学勋 常伟东 彭瑞 

机构地区：[1]国家林业局昆明勘察设计院,云南昆明650216 [2]中国林业科学研究院荒漠化研究所,北京100091 [3]内蒙古赤峰市林业研究所,内蒙古赤峰024000 [4]内蒙古敖汉旗林业局,内蒙古赤峰024300

出　　处：《林业科学研究》2015年第2期255-260,共6页Forest Research

基　　金：国家林业公益性行业科研专项“中国沙地补充考察与沙地志编研”(编号:201304325);国家自然科学基金“半干旱区低覆盖度固沙林的水分动态及其应对极旱年的调节机理”(编号:31170667)

摘　　要：采用根钻法对低覆盖度行带式栽植模式下赤峰杨的根长密度的空间分布特征进行了研究,同时用烘干法对其根质量密度进行了测量。结果表明:赤峰杨的总平均根长密度在不同土层间变化很大,0.0 40 cm土层为根系主要分布区域,其在总平均根长密度中所占比例高达77.1%;不同径级之间的根长密度差异显著,0.0 0.2 mm径级根系的根长密度最大,可达0.61 cm·cm-3。带间根长密度变化出现了先增大后减少而后略有增大的趋势,环境因子影响根系分布,>2.0 mm的粗根根长密度主要分布于带间。低覆盖度行带式配置模式下的赤峰杨吸收根系(<2mm)主要分布于0 40 cm深度区域,粗根(>2.0 mm)主要分布于地表40 cm以下区域,带间是根系的主要分布区域,根系主要利用的是天然降水。In this study, the root drilling was used to sample the space distribution of root length density （RLD） of the Populus x xiaozhuanica W. Y. Hsu et Liang cv. ＇ Chifengensis ＂which were planted at low coverage belt scheme, the root weight density was measured by drying method simultaneously. The results showed that the total RLD changed dramatically （ P 〈 0.01 ） at different soil depth. Among which, 0 - 40 cm was the main zone of fine root system distribution, taking a greater percentage in all RLD at 77.1%. The differences among diameter class RLDs were striking （P 〈0.01 ）. The fine root at 0.0 -0.2 mm diameter class had the most RLD, up to 0.61cm. -3 cm . With the distance increasing from tree, the RLD increased at first and decreased subsequently, and then in- creased slightly again. So, environment was the key factor influencing the root distribution. Thick root mainly dis- tributed in inner-band. The fine root system of low coverage belt scheme mainly distributed at the depth of 0 -40 cm in the study area. The thick root （ 〉 2.0 mm） mainly distributed below the depth 40 cm underground. It was found that the P. × xiaozhuanica ＇Chifengensis＇ mainly use natural precipitation.

关 键 词：赤峰杨 根系 分布 径级 土壤深度 POPULUS × xiaozhuanica' Chifengensis' 

分 类 号：S718.42[农业科学—林学]