滨海盐碱地土壤水盐影响棉花产量和纤维品质的研究
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