| 滴灌与沟灌对杨树细根空间分布的影响 |
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| 引用本文： | 秘洪雷,兰再平,彭晶晶,马鑫.滴灌与沟灌对杨树细根空间分布的影响[J].浙江农林大学学报,2021,38(6):1136-1143. |
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| 作者姓名： | 秘洪雷 兰再平 彭晶晶 马鑫 |
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| 作者单位： | 1.天津泰达盐碱地绿化研究中心有限公司，天津 3004572.中国林业科学研究院，北京 100091 |
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| 基金项目： | 中央级公益性科研院所基本科研业务费专项(CAFYBB2018MB012) |
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| 摘 要： | 目的 探究不同灌溉方式对杨树Populus细根生长和分布的影响，为滴灌培育人工林提供理论和技术依据。 方法 以5年生欧美杨107 Populus × euramericana ‘Neva’为研究对象，在滴灌和沟灌栽培的人工林中选取标准木，分别在株间、对角和行间方向距树干20、50、100和150 cm处采用根钻法取样，比较其细根生物量密度、细根根长密度、细根比根长的差异。 结果 滴灌条件下株间方向的细根生物量密度与沟灌的差异随水平距离增加而增大(P＜0.05)，对角和行间方向随水平距离增加其差异减小。滴灌下细根生物量密度在株间方向距树干50 cm处最大，对角和行间方向在距树干20 cm处最大。滴灌下株间方向的细根根长密度与沟灌的差异随水平距离增加而增大(P＜0.05)，对角和行间方向的差异随水平距离增加而减小。滴灌下细根根长密度在株间方向距树干50 cm处最大，对角和行间方向在距树干20 cm处最大。滴灌和沟灌下0~40 cm土层的细根生物量分别占0~60 cm土层的81%和73%，细根根长分别占0~60 cm土层的85%和80%。滴灌和沟灌下的比根长随水平距离增加而增大，且均表现为沟灌大于滴灌，不同方向比根长的差异在距树干20 cm处最大，在距树干50 cm处最小。 结论 滴灌能促进杨树人工林细根的生长和周转，影响细根的空间分布，提高林地生产力。图4表1参28
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| 关 键 词： | 滴灌 沟灌 杨树 细根 空间分布 |
| 收稿时间： | 2021-01-04 |
Effects of drip irrigation and furrow irrigation on spatial distribution of fine roots of Populus |
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| BI Honglei,LAN Zaiping,PENG Jingjing,MA Xin.Effects of drip irrigation and furrow irrigation on spatial distribution of fine roots of Populus[J].Journal of Zhejiang A&F University,2021,38(6):1136-1143. |
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| Authors: | BI Honglei LAN Zaiping PENG Jingjing MA Xin |
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| Affiliation: | 1.Tianjin TEDA Saline Land Greening Research Center Co. Ltd, Tianjin 300457, China2.Chinese Academy of Forestry, Beijing 100091, China |
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| Abstract: | Objective This study aims to investigate the effects of different irrigation methods on the growth and spatial distribution of fine roots of Populus, so as to provide theoretical and technical basis for the cultivation of plantation by drip irrigation. Method The 5-year old ‘107’ Populus × euramericana ‘Neva’ was selected as the research object, and standard trees were selected from the plantations cultivated by drip irrigation and furrow irrigation. Root drills were used to sample trees at 20, 50, 100 and 150 cm from tree trunks in the directions of inter plant, diagonal and inter row. The differences of fine root biomass density, fine root length density and fine root specific root length were compared. Result In inter plant direction, the difference of fine root biomass density between drip irrigation and furrow irrigation increased with the increase of horizontal distance, and the difference was significant (P＜0.05). With the increase of horizontal distance, the differences between diagonal and inter row directions decrease. Under drip irrigation, the fine root biomass density was the highest at 50 cm away from the trunk in the direction of inter plant, and the highest at 20 cm away from the trunk in the direction of diagonal and inter row. Under drip irrigation, the difference of fine root length density with furrow irrigation increased with the increase of the horizontal distance(P＜0.05), while the difference of diagonal and row direction decreased with the increase of the horizontal distance. Under drip irrigation, the root length density of fine roots was the largest at 50 cm from the trunk in the direction of inter plant, and the largest at 20 cm away from the trunk in the direction of diagonal and inter row. Under drip and furrow irrigation, the fine root biomass of 0?40 cm soil layers accounted for 81% and 73% of that in 0?60 cm soil layers, respectively, while the fine root length accounted for 85% and 80%. The specific root length under drip irrigation and furrow irrigation increased with the increase of horizontal distance, and the difference of specific root length under furrow irrigation was greater than that under drip irrigation. The difference of specific root length in different directions was the largest at 20 cm away from the trunk and the smallest at 50 cm away from the trunk. Conclusion Drip irrigation can promote the growth and turnover of fine roots, affect their spatial distribution, and improve forest productivity. Ch, 4 fig. 1 tab. 28 ref.] |
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