渭北旱塬花椒-小麦复合系统中林木及作物根系空间分布特征研究

根据样地调查，研究了花椒-小麦复合系统根系的空间分布特征。结果表明，从根系密集区来看，花椒林带根系和小麦根系在垂直分布上基本处于同一分布层；在水平方向上，花椒吸水根系绝大部分分布在林缘附近到0．5倍树高范围内，而小麦愈靠近林缘根系愈少。花椒与小麦的根系分布均集中在0～20cm的表层，在农林复合的配置选择上，应当考虑这一因素，冬小麦的种植区域应当在花椒1倍树高范围以外，以避免两者之间的水肥竞争问题。

Study on the Spatial Distribution Root System of Chinese Prickly Ash and Wheat Agri-forestry in Weibei Arid-plain Area

This thesis, based on field experiment, deals with the spatial distribution of roots of prickly ash-wheat in agri-forestry system. It discovers that: (1) both the conglomeration zone of the prickly ash root system and that of wheat root system are basically located in the same layer vertically; (2)part of prickly ash root system, which absorbs water, is mostly distributed within the area which, horizontally, from the stem to the outward, covers as far as half of the height of the tree, while that of wheat is distributed less when it is closer to the stem. Since both prickly ash and wheat root systems center around in the surface layers from 0 to 20 cm deep, the concern that prickly ash and wheat may compete for fertilizer and water should be put into consideration. Therefore, to choose a more reasonable agriculture-forestry compounding allocation, the wheat field should be as far as the height of prickly ash tree.