| 华北低丘山区核桃-决明子复合模式的根系分布 |
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| 引用本文： | 何春霞,孟平,张劲松,陈平,孙守家,高峻.华北低丘山区核桃-决明子复合模式的根系分布[J].林业科学研究,2013,26(6):715-721. |
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| 作者姓名： | 何春霞 孟平 张劲松 陈平 孙守家 高峻 |
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| 作者单位： | 中国林业科学研究院林业研究所, 林木遗传育种国家重点实验室, 北京 100091;中国林业科学研究院林业研究所, 林木遗传育种国家重点实验室, 北京 100091;中国林业科学研究院林业研究所, 林木遗传育种国家重点实验室, 北京 100091;中国林业科学研究院林业研究所, 林木遗传育种国家重点实验室, 北京 100091;中国林业科学研究院林业研究所, 林木遗传育种国家重点实验室, 北京 100091;中国林业科学研究院林业研究所, 林木遗传育种国家重点实验室, 北京 100091 |
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| 基金项目： | “十二·五”科技支撑项目（2011BAD38B0201）；林业公益性行业科研专项课题（201104009-04） |
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| 摘 要： | 采用分层挖掘法，对株行距为3 m×8 m的核桃-决明子复合模式中的根生物量、总根长密度、吸收根的根长密度和根系直径等进行了调查。结果表明：核桃单作的总根长密度比核桃间作的高7%左右，且在各个土层中吸收根的根长密度都高于核桃间作，而二者的总根生物量和根系直径则差异较小。决明子单作的根系直径比间作决明子的大27.73%，但二者的根长密度和根生物量则差异不大。在核桃-决明子复合模式中，核桃总根生物量和吸收根长均占复合模式总根量的一半以上，其中，在水平方向上，决明子在树行南侧2.5、4.0 m位置根系分布最多，而树行南北1.5 m范围内则较少；核桃根系则主要分布在树行两侧1.5 m范围内。垂直方向上，核桃在30~80 cm土层中的根生物量和吸收根长分别占其总量的64.79%和61.17%，而59.54%的决明子根系分布在0~20 cm土壤中。
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| 关 键 词： | 核桃 决明子 农林复合系统 根系分布 |
| 收稿时间： | 2012/12/21 0:00:00 |
Root Spatial Distribution of Walnut/Cassia Agroforestry System in the Rocky Hilly Area of North China |
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| HE Chun-xi,MENG Ping,ZHANG Jin-song,CHEN Ping,SUN Shou-jia and GAO Jun.Root Spatial Distribution of Walnut/Cassia Agroforestry System in the Rocky Hilly Area of North China[J].Forest Research,2013,26(6):715-721. |
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| Authors: | HE Chun-xi MENG Ping ZHANG Jin-song CHEN Ping SUN Shou-jia and GAO Jun |
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| Institution: | Research Institute of Forestry, Chinese Academy of Forestry, State Key Laboratory of Tree Genetics and Breeding, Beijing 100091, China;Research Institute of Forestry, Chinese Academy of Forestry, State Key Laboratory of Tree Genetics and Breeding, Beijing 100091, China;Research Institute of Forestry, Chinese Academy of Forestry, State Key Laboratory of Tree Genetics and Breeding, Beijing 100091, China;Research Institute of Forestry, Chinese Academy of Forestry, State Key Laboratory of Tree Genetics and Breeding, Beijing 100091, China;Research Institute of Forestry, Chinese Academy of Forestry, State Key Laboratory of Tree Genetics and Breeding, Beijing 100091, China;Research Institute of Forestry, Chinese Academy of Forestry, State Key Laboratory of Tree Genetics and Breeding, Beijing 100091, China |
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| Abstract: | Since the root distribution characteristics show spatial pattern of water and nutrition absorption of each plant species, they decide belowground competition degree in agroforestry system. The method of stratified digging was adopted to study the root dry biomass, root length density, fine root length density and root diameter in walnut (Juglans regia L.)/cassia (Triticum aestivum L.) agroforestry pattern with spacing of 3 m×8 m. The results showed that total root length density of monocultured walnut was 7% higher than that of the intercropped walnut; the monocultured walnut had higher fine root length density than the intercropped walnut at each soil layer; while the intercropped and the monocultured walnuts had slight difference in root biomass and root diameter. The root diameter of monocultured cassia was 27.73% greater than that of intercropped cassia, while their difference in root length density and root biomass were minor. Root biomass and root length of intercropped walnut accounted great proportion in the agroforestry system. In which, horizontally, cassia distributed its root mainly at 4.0 m and 2.5 m south to the tree line, while walnut spread its root mainly at a 150 cm distance scope to its trunk. And vertically, intercropped walnut distributed 64.79% of root biomass and 61.17% of root length at 30~80 cm soil profile, while 59.54% of intercropped cassia root distributed at 0~20 cm soil profile in the walnut/cassia intercropping. The above results suggest that intercropped walnut and cassia staggered root distribution position and avoided strong belowground competition. Thus, walnut-cassia agroforestry model has great potential to develop economically and ecologically in the low hilly area of north China. |
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| Keywords: | Juglans regia Triticum aestivum agroforestry system root distribution |
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