生育中期水分亏缺复水对水稻根冠及水肥利用效率的补偿影响  

Compensation effects of roots and shoots of rice and water and fertilizer utilization efficiency owing to rewatering of water deficit during intermediate period of bearing

作　　者：魏征[1,2] 彭世彰[1] 孔伟丽 高焕芝[1,2] 

机构地区：[1]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [2]河海大学水利水电学院,江苏南京210098 [3]衢州市水利水电勘测设计有限公司,浙江衢州324000

出　　处：《河海大学学报（自然科学版）》2010年第3期322-326,共5页Journal of Hohai University(Natural Sciences)

基　　金：国家高技术研究发展计划(863计划)(2006AA100202);全国优秀博士学位论文作者专项基金(200546)

摘　　要：为明确水分亏缺复水补偿效应,通过盆栽试验研究了不同施氮水平和不同生育阶段水分控制下限对水稻生长特性的影响.结果表明:不同水氮条件下,水稻根冠干物质累积、根冠异速性生长关系、产量构成因子和水肥利用效率均随胁迫阶段的推进差异显著.分蘖末期水分胁迫复水后能够产生明显的补偿效应,该阶段高氮施肥水平(300kg/hm2)下,重度水分亏缺(40%土壤饱和体积含水率)复水后能够较少影响水稻生长,可以看做是合理的水稻调亏控制指标.In order to determine the compensation effects of rewatering of the water deficit,pot experiments were carried out to study the influences of the lower limit of soil moisture of around rice with different nitrogen levels at different bearing periods on growing characteristics. The results show that,with different nitrogen levels,the dry matter production of roots and shoots,allometric growth between roots and shoots,rice yield,and water and fertilizer utilization efficiency exhibit significant differences with the water stress stage. Rewatering of the water deficit at the late tillering stage results in significant compensation effects. The rewatering of severe water deficit （saturated water content of 40%） has lesser influence on the rice growth at the late tillering stage with a high nitrogen fertilization level （300 kg/hm2）,and it may be regarded as a reasonable control index for rice.

关 键 词：根冠关系 水分亏缺 复水 水肥利用率 补偿效应 水稻 

分 类 号：S274.1[农业科学—农业水土工程] S511[农业科学—农业工程]