摘要
为探讨不同绿肥轮作还田模式对沿海滩涂土壤的改良效果,通过田间试验研究了黑麦草-田菁(LS)、蚕豆-田菁(VS)2种轮作模式下绿肥还田生物量、养分(碳、氮、磷、钾)累积量以及土壤pH、有机碳含量、全氮含量、碱解氮含量、有效磷含量、速效钾含量、水溶性盐总量的变化,以及各指标间的相关性。结果表明,LS轮作模式下的还田生物量整体高于VS轮作模式。LS轮作模式下5季绿肥的碳、氮、磷、钾养分累积总量较VS轮作模式下分别增加27.80%、9.80%、33.60%和27.10%。2种轮作模式下,1~5季绿肥翻压还田后,土壤pH值为8.02~8.26,土壤有机碳、全氮、碱解氮、有效磷含量分别较种植前增加17.70%~99.60%、6.90%~100.00%、53.60%~158.00%和1.39%~71.26%,且整体以LS轮作模式下较高。土壤水溶性盐总量在第1~3季逐渐降至1.00 g/kg以下,第4~5季又呈缓慢上升趋势。综上,不同绿肥轮作模式下绿肥还田可明显改善滩涂土壤养分和盐分状况,且LS轮作模式优于VS轮作模式。
In order to explore the improvement effect of different green manure rotation patterns on coastal soil, field experiments were conducted to study the changes of biomass, nutrient(carbon, nitrogen, phosphorus, potassium) accumulation, soil pH, organic carbon content, total nitrogen content, alkali-hydrolyzed nitrogen content, available phosphorus content, available potassium content, water-soluble salt content, and the correlation between the indicators under two rotation patterns of Lolium perenne L.-Sesbania cannabina(LS) and Vicia faba L.-Sesbania cannabina(VS). The results showed that the overall returning biomass under LS rotation pattern was higher than that under VS rotation pattern. Compared with VS rotation pattern, the total accumulation of carbon, nitrogen, phosphorus and potassium in the five seasons of green manure under LS rotation pattern increased by 27.80%, 9.80%, 33.60% and 27.10%, respectively. Under different rotation patterns, after returning green manure to field in the first-fifth seasons, the soil pH was 8.02-8.26, the contents of soil organic carbon, total nitrogen, alkali-hydrolyzed nitrogen and available phosphorus were increased by 17.70%-99.60%, 6.90%-100.00%, 53.60%-158.00% and 1.39%-71.26% compared with those before planting, and they were higher under LS rotation pattern. Soil water-soluble salt content gradually decreased to below 1.00 g/kg in the first to third seasons, and then increased slowly in the fourth to fifth seasons. In conclusion, different green manure rotation patterns can significantly improve the nutrient and salinity conditions of coastal soil, and LS rotation pattern is better than VS rotation pattern.
作者
朱小梅
洪立洲
邢锦城
刘冲
董静
王建红
何苏南
孙果丽
ZHU Xiao-mei;HONG Li-zhou;XING Jin-cheng;LIU Chong;DONG Jing;WANG Jian-hong;HE Su-nan;SUN Guo-li(Institute of Agricultural Sciences in the Coastal District of Jiangsu Province,Yancheng 224002,China;Zhejiang Academy of Agricultural Sciences,Hangzhou 310021,China)
出处
《江苏农业学报》
CSCD
北大核心
2022年第6期1510-1516,共7页
Jiangsu Journal of Agricultural Sciences
基金
国家绿肥产业技术体系项目(CARS-22-G-15)
江苏现代农业产业技术体系建设项目[JAST(2021)243]
江苏省农业科技自主创新基金项目[CX(21)3169]。
关键词
沿海滩涂
绿肥轮作
生物量
养分累积量
土壤改良
coastal area
green manure rotation
biomass
nutrient accumulation
soil improvement
