暗沟对宁夏盐碱地土壤盐分和垂柳生长的影响

发布时间：2018-10-05 21:44

【摘要】：采用暗沟排盐技术,研究在施用改良剂和有机肥等配套措施的条件下,不同间距暗沟(3 m、6 m、9 m和15 m)对宁夏盐碱地pH、Ca~(2+)、Mg~(2+)、Na~+、电导率(EC)、钠吸比(SAR)、有机质(SOM)及垂柳生长的影响.结果表明:(1)改良前土壤的EC大于4.00 d S/m,改良后所有处理包括CK(无暗沟和有配套措施)的EC全都小于1.50 d S/m;60-80 cm和80-100 cm土层的EC值在各个处理间没有显著差异,而0-20 cm、20-40 cm和40-60 cm土层的CK与其他处理有显著差异(P0.05).(2)改良前土壤的p H值基本都在9.00以上,改良后3 m、6 m、9 m和15 m间距暗沟以及CK(无暗沟和有配套措施)的p H基本都在8.50左右,但不同处理间p H值没有显著差异.(3)0-20 cm、20-40 cm土层中,暗沟处理的SAR显著低于CK(P0.05),15 m间距暗沟的SAR大于3 m、6 m和9 m间距暗沟;其他土层中,各个处理间的SAR没有显著差异.(4)相比CK,暗沟处理的有机质含量显著降低(P0.05),其中9 m间距暗沟的有机碳含量最高.(5)3 m、6 m、9m间距暗沟的垂柳生长状况显著好于15 m间距暗沟和CK的生长状况(P0.05).综上,暗沟排盐技术配套其他措施能够有效地改良盐碱地,综合考虑暗沟设置成本和改良效果,9 m间距暗沟为最佳选择.
[Abstract]:The effects of different spacing of dark ditch (3 m ~ 6 m ~ (9 m) and 15 m) on pH,Ca~ (2) mg ~ (2) Na ~ (2), (EC), sodium uptake ratio of (SAR), organic matter (SOM) and the growth of weeping willow were studied by using dark ditch salt discharge technique under the condition of applying modifier and organic fertilizer. The results showed that: (1) the EC of soil before improvement was greater than 4.00dS / m, and the EC values of all treatments, including CK (no dark ditch and matched measures), were all less than 1.50d S / m ~ (-1) 60-80 cm and 80-100 cm, and there was no significant difference among the treatments. However, there was significant difference in CK between 0-20 cm,20-40 cm and 40-60 cm soil layer and other treatments (P0.05). (2). The pH value of soil was above 9.00 before the improvement. The pH of the soil after improvement was about 8.50, with the interval of 3 m ~ 6 m ~ 9 m and 15 m ~ (m) and CK (without dark ditch and with supporting measures) basically about 8.50, and the difference was significant between 0-20 cm,20-40 cm and 40-60 cm soil layer (P0.05). (2). However, there was no significant difference in pH value between different treatments. (3) in 0-20 cm,20-40 cm soil layer, the SAR of dark ditch treatment was significantly lower than that of CK (P0.05) 15 m interval SAR was greater than that of 3 m ~ 6 m and 9 m ~ (th) interval, and in other soil layers, (4) compared with CK, organic matter content in dark ditch was significantly decreased (P0.05), and organic carbon content in 9 m furrow was the highest. (5) the growth status of weeping willow in 3 m ~ 6 m ~ (9 m) furrow was significantly better than that in 15 m ~ (m) interval. The growth status of dark ditch and CK (P0.05). In a word, other measures can effectively improve the saline-alkali land, and the best choice is to consider the cost of setting up the dark ditch and the effect of the improvement.
【作者单位】：北京林业大学森林资源与生态系统过程北京市重点实验室;宁夏大学新技术应用研究开发中心;
【基金】：国家林业公益性行业科研专项(201504402)资助~~
【分类号】：S156.4;S792.12

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