摘要
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。
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.
出处
《江西农业大学学报》
CAS
CSCD
1999年第2期149-152,共4页
Acta Agriculturae Universitatis Jiangxiensis
基金
江西省自然科学基金
关键词
旱种
水陆稻
根系
耐旱性
生长发育
upland rice
paddy rice
root system
drought resistance
the growth and development
