旱作高产田产量波动性和土壤干燥化  

FLUCTUATION OF YIELD ON HIGH-YIELD FIELD AND DESICCATION OF THE SOIL ON DRYLAND

作　　者：李玉山[1] 

机构地区：[1]中国科学院水利部水土保持研究所,陕西杨凌712100

出　　处：《土壤学报》2001年第3期353-356,共4页Acta Pedologica Sinica

基　　金：国家自然科学基金 (4 9890 3 3 0 );国家科技攻关项目 (96-0 0 4 -0 5 )的阶段性研究成果

摘　　要：根据旱地作物长期田间试验数据 ,论述了旱作农业生产中作物产量波动性是一个规律性现象 ,并用波动系数加以表述。研究结果表明旱作高产田与低产田相比 ,存在相似的产量波动性 ,区别是它在较高产量水平上波动。高产田作物耗水量较高 ,从而导致土壤相对干燥化。土壤干燥化是高产田产量产生波动性的直接原因 ;而低产田则因作物吸水能力低 。Based on the data of a long term field experiment of dryland crops, t his art icle points out that yield fluctuation, expressed in fluctuating coefficient, is a regular phenomenon in dryland farming. High-yield field has a similar fluctua tion as compared with low-yield field but their mechanisms are different. Desicc ation happened in the entire soil profile is a direct cause of the yield fluctuation f or high-yield field, but low water absorbing capacity of the crop for low-yieldi ng field.

关 键 词：旱地作物 产量波动性 干燥过程 高产田 土壤储水 水土保持 

分 类 号：S157.4[农业科学—土壤学] F343.1[农业科学—农业基础科学]