摘要
在甘肃定西极端干旱年型下,通过大田试验处理表明,浇灌底墒水、施磷和覆膜对春小麦地上和地下部分有显著的调控作用.在春小麦生长的前期和中期,可显著增加次生根条数,根系分布层次下移,0～60cm层次根系比例增加,并推迟根系衰老,有利于干物质适当较早地向繁殖器官转移;;在生长的后期,覆膜处理地上部干物质积累增加很少,部分器官干物质量还减少,同化物有效供给不足,同浇水、浇水施磷处理相比,浇水覆膜、浇水施磷覆膜处理分别减产49.56%,40.56%,以浇灌底墒水和施用磷肥的处理产量最高.
Field experiments showed that the in?uence of the combination of pre-sowing watering and the application of phosphorus and plastic ?lm mulching on rooting and shooting growth of spring wheat was signi?cant under the condition of extreme drought at the region of Dingxi County, China. Those agronomic measures could distinctly increase the number of wheat nodal rootings, and result in the distribution of deep rooting, esp. at the range of 0～60cm, and slow the death rate of the root system and bene?t dry matter allocation to the productive organ at the beginning and middle stage of spring wheat growth. But after this period, the amount of dry matter accumulation increased a little in the treatment with plastic ?lm mulching and even decreased in some organs. So photosynthesis was not su?ciently available to resource assignment. Compared with the treatment of W and WP, the yield of WM and WPM decreased by 49.56% and 40.56%, respectively. And the yield of pre-sowing watering and application of phosphorus in all treatments was most e?cient.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2004年第1期80-84,共5页
Journal of Lanzhou University(Natural Sciences)
基金
国家自然科学基金资助项目(39400019).
关键词
早地
春小麦
底墒水
磷素
地膜
dry land
spring wheat
pre-sowing water
phosphorus
plastic film
