旱作条件下水陆稻灌浆期根系生长特性研究

对旱作条件下水陆稻灌浆期根系生长特性作了比较研究，结果表明：（１）灌浆期根系的垂直分布不同，水稻的根系一般分布在０～４０ｃｍ土层，陆稻根系一般分布在０～６０ｃｍ土层，最深可达８０ｃｍ，且水稻总根系分布较浅（０～３０ｃｍ间占总量的８７．０２％～９６．６７％），陆稻总根系分布较深（０～３０ｃｍ间只占总量的６１．４２％～８１．７０％）。因此，陆稻具有深扎根性。（２）除比根长参数外，不论是同一垂直位置，还是整个根系，陆稻的各根参数值远远大于水稻，甚至达３．２１倍。（３）旱作条件下，陆稻的比根长小于水稻，即陆稻的根直径略大于水稻，这可能是生态适应性的缘故。（４）陆稻的耐旱性强于水稻。

A Comparative Study on the Growth and Development of the Root Systems of Paddy Rice and Upland Rice During the Grain Milking Stage in Upland Cultivation

The growth and development of the root systems of paddy rice and upland rice during the grain milking stage in upland cultivation were comparatively studied. The results showed that:(1)The vertical distribution of the root systems of upland rice and paddy rice were different during the grain milking stage; the depth of the distribution of paddy rice root system was generally about 40 cm; the depth of the distribution of upland rice root system was generally about 60 cm, minority roots may be 80 cm. The distribution of paddy rice root system was shallow, the distribution between 0 and 30 cm was 87.02%96.07% of the total root system. The distribution of upland rice root system was deep, the distribution between 0 and 30 cm was 61.42%81.7% of the total root system; So upland rice had deep-root nature.(2)Both of the same vertical position and the whole root system, the root parameters of upland rice except root length/root dry weight were remarkably bigger than those of paddy rice, even amounting to 3.21 times.(3)The root length/root dry weight of upland rice was slightly smaller than that of paddy rice, or the root diameter of upland rice was slightly bigger than that of paddy rice. This is probably because of the eco-adaption.(4)The drought resistance of upland rice was stronger than that of paddy rice.