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重点论文网    城乡论文    水利水电论文    PAM改善三峡库区坡耕地水土环境及对玉米产量的影响
创建时间:04-08

PAM改善三峡库区坡耕地水土环境及对玉米产量的影响

 


摘要:在三峡库区,耕地资源十分有限,且坡耕地占有相当大的比重,在不良的耕作方式下肥力低下,水土流失十分严重。为了改善土壤水土环境,提高土地的生产力,促进农作物的生长,采用聚丙烯酰胺(PAM)进行了增加土壤水稳定性团聚体数量,增加土壤人渗的试验。实验表明,经PAM 处理后,土壤水稳性团聚体含量均高于对照,在同一施用方式下,有随PAM 浓度的加大其含量呈上升趋势。PAM 施用能提高土壤的渗透性,同时,PAM 增产效果显著,增产幅度为4.2%~11.3% 。
关键词:聚丙烯酰胺(PAM);水稳定性团聚体;入渗;土壤改良;增产


Impacts of polyacrylamide application on soil water status
of slope-cultivated land in Three-Gorge Reservoir Area and the growth of corn
Abstract: In Three-Gorge Reservoir Area, cultivated land resource is very limited, of which a rather high proportion is slope farmland, including a large area of steep cultivated land. Due to poor cultivation and management, soil and water loss is very serious. Application of polyacrylamide(PAM) on the soil surface can significantly increase water infiltration of soil .The result showed that PAM could increase the quantity of soil water-stable aggregates. Under the same application, the quantity of soil water-stable aggregates increased with the increase of concentration of PAM. That is PAM has a better effect on soil improvement. PAM can also increase yield significantly at rate of 4.2%~11.3%.
Key words: PAM; water-stable aggregate; infiltration; soil improvement; yield increase 


0 引 言
  在三峡库区以山地为主,非耕地资源、生物资源十分丰富。但是由于生存与发展的压力,以及长期以来不正确的发展思路和对农业资源的不合理利用,已造成农地生态系统植被大范围破坏,土地生产力下降,水土流失加剧,农业生产条件恶化,农地生态系统功能退化严重,三峡水库建成后,库区人地矛盾将更加突出。因此,改善土壤水土环境,提高土地的生产力就成为迫在眉睫的首要任务。 
 

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