次生盐渍化对膜下滴灌棉花生长发育的影响及其预警研究

Effect of Secondary Salinization on the Growth of Cotton with Drip Irrigation under Mulch and Early Warning Research

以7块次生盐渍化程度不同的膜下滴灌棉田为研究对象,探明次生盐渍化对新疆棉花生长发育的影响,并以此为基础探讨其状态预警问题。研究结果表明:在各生育期,土壤盐度和棉花株高、干物质重、叶面积指数均呈极显著的负相关关系。生育期不同,影响棉花生长的关键盐度也有所差别。各棉田的警度随着生育期的进行有逐渐减轻的趋势。0.6 dS/m以下的土壤盐度在各生育期都不会对棉花生长造成较大危害,2.8dS/m以上的土壤盐度在前期更易对棉花生长造成严重影响,到吐絮期2.8 dS/m左右的盐度已不能对棉田造成较大危害。

Effect of secondary salinization on the growth of cotton was researched to discuss by seven cotton fields with drip irrigation under mulch with the salinity gradient in Xinjiang, to discuss the problem of early warning on the basis of it. The results showed that plant height, dry matter weight and leaf area index showed a significant negative correlation with soil salinity respectively in different growth period. The key salinities affecting the growth of cotton were different in different growth period. The warning degree of each cotton field tended to reduce gradually with the growth period process. The soil salinity below 0.6 clS/m would not harm the growth of cotton in every growth periods, the soil salinity above 2.8 dS/m would result in a serious impact the growth of cotton in early growth periods, in boll opening period the soil salinity around 2.8 dS/m had not caused harm the growth of cotton.