摘要
通过对不同灌溉处理下旱稻根系生长及水分利用效率的试验研究,结果表明:旱稻根系大部分根干重都集中在地表以下30cm内;不同灌水处理对根量及其分布有着显著不同的影响,灌水量越少,水分胁迫处理下的根系系统在30cm以下分布相对越多,中下层土壤中根系占的百分率越高;其中限量灌溉Ⅱ产量较充分灌溉处理减幅最小,穗粒数减幅也最小,农业水分利用效率最高,根冠比次高,增加了对土壤深层水的利用,减少了灌溉水的投入。在水资源缺乏的北京地区,是一种较为合理的灌溉方式。
The field experiments were conducted to examine the effects of different irrigation treatments on the root growth and the water use efficiency of upland rice. The results showed that the most root dry weights of upland rice were distributed within 0～30cm soil layer. The less the irrigation obtained and the stronger the water stress had, the more roots distributed under 30cm soil layer. The decrease degree of yield and grain per ear by treatment of limited irrigationⅡwere the smallest compared with the full irrigation treatment. The treatment of limited irrigationⅡwas with highest water use efficiency and recommended as one of the reasonable irrigation alternative for upland rice in Beijing region.
出处
《中国农业气象》
CSCD
2004年第4期44-48,共5页
Chinese Journal of Agrometeorology
基金
国际合作项目"Hydrologicalfieldexperimentsonaerobicrice"
