农桐间作复合生态系统研究进展

该文对７０年代以来国内外涉及农桐间作复合生态系统的研究报告总结如下：①泡桐是强阳性树种．由于具有根系分布深、树冠稀疏等特性，较适宜与农作物复合经营；②间作后由于系统具有减低风速和最高温的作用，因此有助于提高系统抵御灾害天气的能力，但对光的截留对提高系统内作物的产量有副效应；③间作前６ａ和６ａ后，适宜的间作密度分别为５ｍ×２０ｍ和小于５ｍ×３０ｍ，但该结论仍有争议，尚待进一步研究验证；④幼龄间作林营养补给的效果仍存在争议，但接干修枝的研究成果已被生产单位普遍接受；⑤在提高研究手段，完善研究方法的前提下，不同桐种叶面积指数变化规律、树冠对光的截留、光质、光量的时空变化规律、系统内农作物光能结合及系统效应评价方法等领域将是今后农桐复合经营系统研究的重点．

Advances of the Studies on Paulownia Crops Intercropping System

The summarization of research results relating to Paulownia crops intercropping system from 1970's shows that Paulownia is a sunlight loving and very practical tree species for agroforesty because of its deep root system and sparse branches. Moreover, the system is conducive to increase the ability of defending natural disaster by lowering the wind velocity and the highest temperature, but not to the production because the sunlight is intercepted by Paulownia crowns. The suitable density of Paulownia, which is still uncertain now, is 5m×20m before six year old and 5m×30m after that. There is controversy about the nutrition supplement of the young stands, but the technology of stem extension and pruning has been widely applied.Therefore, the research fields should be focused on varying regularities of LAI, sunlight distribution and its use efficiency and the economic evaluation.