摘 要:为了确定滨海盐碱地棉花生长最有利的土壤水盐条件,于年实施了不同土壤水盐环境的大田土柱试验,并设定了不同的水埋深处理 (2013年分别为0.6、1.0、1.4、1.8、2.2、2.6 m;2014年分别为0.4、0.8、1.2、1.6、2.0、2.4 m)。结果表明 (1) 在相对干旱的2013年,较优水埋深为 1.4 m 和 1.8 m,拟合结果为1.87 m。在相对湿润的2014年,较优水埋深为1.6 m 和 2.0 m,拟合结果为1.73 m。(2) 棉花籽棉产量和纤文品质在较优水埋深处理均达到较优值。与较优水埋深处理的平均籽棉产量相比 (两处理的平均值),籽棉产量 (2013年水埋深0.6 m和2.6 m 处理,2014年水埋深0.4 m和2.4 m 处理) 分别降低了73.9%,21.4%和71.4%,21.4%。籽棉产量的降低主要是由铃数减少导致的。综上,0-40 cm土层较适合的土壤相对含水量在干旱的2013年为61.91%-72.14%,在湿润的2014年为70.09%-73.66%;同样,0-40 cm土层较适合的土水比1:5浸提液电导率在2013年为0.81-1.08 dS m-1,在2014年为0.37-0.42 dS m-1。31409
毕业论文关键词:滨海土壤,水埋深,产量,纤文品质
Soil water and salt affect cotton (Gossypium hirsutum L.) yield and fiber quality in coastal saline soil
ABSTRACT: To target the favorable conditions for cotton growth in coastal saline soil, a two year field experiment was conducted in 2013 and 2014 by setting various environments for soil water and salt with different groundwater depths (0.6, 1.0, 1.4, 1.8, 2.2, 2.6 m in 2013 and 0.4, 0.8, 1.2, 1.6, 2.0, 2.4 m in 2014). Results showed that (1) the optimal groundwater depth was 1.4 m and of 1.8 m, and 1.87 m for fitting in relatively arid year of 2013. In relatively humid year of 2014, the optimal groundwater depth was 1.6 m and 2.0 m, and 1.73 m for fitting. (2) Cotton yield and fiber quality all approached to the highest values in the optimal treatments. As compared to optimal groundwater depths, the seed cotton yield was dropped by 73.9%, 21.4% and 71.4%, 21.4% under groundwater depth of 0.6 m, 2.6 m in 2013 and of 0.4 m, 2.4 m in 2014, respectively. Reduced boll number played a critical role to decrease seed cotton yield. In summary, the favorable soil-relative water contents for 0-40 cm soil depth were 61.91%-72.14% in dry year of 2013 and 70.09%-73.66% in humid year of 2014, respectively; similarly, electrical conductivity of a 1:5 distilled water for 0-20 and 20-40 cm soil depth was recorded as 0.81-1.08 dS m-1 in 2013, while 0.37-0.42 dS m-1 in 2014, respectively.
Key words: Coastal saline soil, Groundwater depth, Yield, Fiber quality
目 录
摘 要 1
关键词 1
ABSTRACT 1
KEY WORDS 1
1 引言 1
2 材料与方法 2
2.1 试验材料与设计 2
2.2 气象资料 3
2.3 实际水埋深监测 3
2.4 土壤样品收集和土壤相对含水量 3
2.5 土壤分析 3
2.6 生物量测定 3
2.7 产量和纤文品质测定 3
2.8 数据分析 4
3 结果 4
3.1 水埋深 4
3.2 水埋深对滨海棉田土壤水盐含量的影响 4
3.3 土壤水盐对棉花生物量、产量和纤文品质的影响 4
4 讨论 7
4.1 水埋深对滨海棉田水盐含量的影响 7
4.2 土壤水盐含量对棉花产量和纤文品质的影响 7
结 论 8
致 谢 8
参考文献 9
滨海盐碱地土壤水盐影响棉花产量和纤文品质的研究1 引言 滨海盐碱地土壤水盐影响棉花产量和纤维品质的研究:http://www.751com.cn/shengwu/lunwen_27558.html