泡桐、杨树叶水浸液对作物种子萌发的化感作用

为了研究农林复合生态系统中树种对农作物种子萌发的影响，以泡桐和杨树为对象，采用振荡溶解的方法提取泡桐和杨树叶浸出液，通过测定种子萌发率，研究树叶水提取物对小麦、玉米、大豆种子萌发的化感作用。结果表明：（1）杨树和泡桐叶水提取物质量浓度达到50 mg/mL对大豆的发芽率、发芽速率有明显抑制作用；杨树叶水提取物质量浓度达到10 mg/mL和泡桐叶水提取物质量浓度高于20mg/mL对小麦、玉米有显著的抑制作用。（2）杨树叶水浸液对3种作物种子萌发的化感作用（RI=15.147）大于泡桐叶（RI=13.973）。（3）杨树和泡桐叶水浸液对3种作物种子的化感抑制作用强度依次为小麦>玉米>大豆，而且随着杨树和泡桐叶水浸液质量浓度的上升其化感抑制作用越来越强，作物种子的发芽率也越来越低。

Allelopathy of paulownia and poplar leaves aqueous extracts on crop seed germination

In order to study the effects of the tree species on the germination of corp seed in agro-forestry ecosystem, chosing the paulownia and poplar as research object, the leach liquor from paulownia and poplar leaves was extracted through the way of whipping and liquation. The leaves aqueous extracts were used to study allelopathic effects on the germination of wheat, corn and soybean. The results showed that: (1)it obviously produced inhibition on germination rate of soybean once the density of paulownia and poplar leaves aqueous extracts to the point of 50mg/mL; when the density of poplar leaves aqueous extracts to 10 mg/mL and the density of paulownia leaves aqueous extracts over 20 mg/mL, it caused the obviously inhibition on germination rate of wheat and corn. (2)the allelopathic effects of poplar leaves aqueous extracts on the three kinds of crops (RI=15.147)were more than paulownia(RI=13.973); (3) the allelopathic inhibitory effects of poplar and paulownia leaves aqueous extracts were ranked as: wheat>corn>soybean. With the increasing of density of poplar and paulownia leaves aqueous extracts, the allelopathic inhibitory effects become more and more powerful and the germination rate of crops get lower.