水土保持耕作对夏种大豆光合、蒸腾及水分利用效率的影响  

Effects of conservation tillage on the photosynthesis,transpiration and water use efficiency of summer sown Glucine max

作　　者：邵新庆[1] 沈禹颖[2] 王堃[1] 

机构地区：[1]中国农业大学草地研究所,北京100094 [2]兰州大学草地农业科技学院,甘肃兰州730020

出　　处：《草业学报》2005年第6期82-86,共5页Acta Prataculturae Sinica

基　　金：国家重点基础研究发展规划(G2000018602);农业部丰收计划项目(200161280201)

摘　　要：在甘肃黄土旱塬区,以夏种大豆为试验材料,对不同水土保持耕作方式下夏种大豆光合生理生态特征及水分利用效率进行了试验研究。结果表明,在生育期内,夏种大豆净光合速率呈下降的趋势,峰值出现在生长早期,可能主要受当地日照时数及有效辐射特点的影响。覆盖麦草耕作能有效减少土壤蒸发、增加耕层土壤含水量,显著提高夏种大豆叶片的净光合速率(P<0.01)及水分利用效率,净光合速率与水分利用效率呈正相关。水土保持耕作措施可使农田的光、温和水资源得到科学有效地利用。The effects of different tillage practices on summer sown Glucine max cv. Fengshou 12 at different growth stages were studied at Xifeng located on the Loess Plateau, Gansu province. The summer sown G. max appeared to have a descending tendency within the season, with the peak values in the early stages. The physiological and ecological character of summer G. max was related to sun-shine hours and photosynthesis available radiation （PAR） conditions. Straw mulching enhanced the Pn of summer sown G. max with Pn also shown to have a high correlation with soil water content. Further, the practice of conservation tillage also improved the WUE of summer sown G. max.

关 键 词：夏种大豆 光合速率 水分利用效率 水土保持耕作 

分 类 号：S565.1[农业科学—作物学] S157