不同灌溉模式稻田土壤速效氮磷存储能力及其熵权系数评价

Entropy Weight Coefficient Evaluation and Analysis of Available N and P Reservation Ability of Paddy Rice under Different Irrigation Patterns

针对我国水资源短缺及稻田土壤氮磷流失严重的问题,设计浅水勤灌、浅湿灌溉、湿润灌溉、控制灌溉、蓄水控灌、深水淹灌6种水稻灌溉模式,分析了各模式下不同土层(0~10,10~20和20~40 cm)土壤速效氮及速效磷含量,以提高耕层土壤供氮和供磷能力为目标,引入熵权系数模型,对不同灌溉模式进行评价和优选。结果表明,上述6种灌溉模式的熵权系数评价值依次为0.60、0.62、0.66、0.84、0.94、0.72。熵权系数评价值越高,表明该灌溉模式下土壤速效氮磷储量越大。鉴此,6种灌溉模式中,蓄水控灌存储土壤中速效氮磷的效果最优,控制灌溉次之,浅水勤灌相对较差。

In this paper,aiming at the problems of the shortage of water resources and loss of nitrogen and phosphorus from paddy rice field in China,the six irrigation patterns,including frequent and shallow irrigation,shallow and wet irrigation,wet irrigation,controlled irrigation,rain-catching and controlled irrigation,and deep water flood irrigation,were designed.The contents of soil available nitrogen and phosphorus in different soil layers（0-10,10-20 and 20-40 cm） were observed and analyzed,and the entropy weight coefficient model was introduced to evaluate and select the best scheme in order to improve soil nitrogen supply and phosphorus supply capacity.The results showed that：the entropy weight coefficient of the six irrigation patterns were 0.60,0.62,0.66,0.84,0.94,0.72,respectively.A higher entropy weight evaluation indicated a better irrigation pattern that possessed more available nitrogen and phosphorus in the soil.In this study,the best pattern with the best retention capacity of soil available nitrogen and phosphorus wais rain-catching and controlled irrigation,followed by the controlled irrigation,while the frequent and shallow irrigation was relatively the worst.