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作 者 ：李凤民,刘小兰,王俊

期 刊 ：生态学报 2001年 21卷 11期 页码：1941~1946

关键词：春小麦；底墒；磷肥；水分利用效率；产量；根系；

Keywords:spring wheat, pre\|sowing soil moisture, phosphorus, water use efficiency, grain yield, root system,

摘 要 ：研究了浇底墒水和施磷肥对春小麦产量形成的影响。实验设 4个处理 :对照 (CK) ;耕作层施磷 (P) ;浇 3 0 mm底墒水 (W) ;施磷加浇 3 0 mm底墒水 (PW)。测定土壤含水量、根系生物量、地上生物量和测产等。结果表明 ,WP处理根重和中下层分配比例均较高。与 W处理相比 ,WP处理利用底墒并没有增加 ,但水分利用效率和产量均增加。决定产量的主要因素是小麦早期小穗和小花形成的数量和质量。 W和 WP两个浇底墒水的处理 ,其土壤水分利用量平均为 3 4 .6mm,略高于所浇的底墒水的量 (3 0 mm)。CK、P、W、WP等 4个处理的籽粒产量分别为 91 7.7,1 1 91 .1 ,2 5 1 6.5 ,2 73 4 .1 kg/hm2 ,水分利用效率分别为 0 .1 86,0 .1 92 ,0 .1 72 ,0 .2 0 7g/(mm· m2 )。

Abstract:This paper investigated the effect of pre\|sowing irrigation and phosphorus fertilizer supply on grain yield formation. Four treatments were employed: CK was as a control, P was phosphorus fertilizer applied in cultivated soil layer, W was pre\|sowing irrigation with 30 mm water depth, WP was W plus P. Soil moisture, root and shoot biomass, and grain yield were measured in the given periods. The root biomass and its distribution in medium and down soil layers in WP treatment were higher than others. Compar...

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