聚丙烯酰胺对紫色土坡地耕作位移及土壤结构的影响
发布时间：2018-08-09 08:17
【摘要】：为了采用化学措施防治坡地耕作侵蚀,以紫色土典型坡耕地为研究对象,采用磁性示踪和模拟耕作等技术研究了聚丙稀酰胺(PAM)后不同坡度(5°,10°,15°,20°,25°)坡地耕作位移和土壤团聚体结构稳定性的影响。结果表明:(1)添加PAM后不同坡度坡地耕作位移均明显低于对照(未添加PAM),其中在20°和25°坡面显著减少了49.16%和67.96%;(2)与对照相比,土壤中添加PAM后0.25mm非水稳定性团聚体含量在5°,10°,15°,20°,25°坡度分别减少了33.74%,46.67%,37.56%,52.70%,62.50%,不同坡度土壤团聚体结构破坏率(PAD)平均降低了60.05%,而平均质量直径(MWD)和平均几何直径(GMD)值分别增加了41.94%和55.09%;(3)耕作位移量与PAD值呈显著的正线性相关性,而与MWD和GMD值呈负线性相关性(P0.05)。坡地土壤添加PAM后可以有效降低耕作位移量,增强土壤结构稳定性,减少耕作侵蚀。在农业生产中PAM可用于控制较陡(≥20°)坡地的耕作侵蚀。
[Abstract]:In order to control tillage erosion of sloping land by chemical measures, the typical sloping farmland in purple soil was used as the research object. The effects of magnetic tracer and simulated tillage on tillage displacement and structure stability of soil aggregates after polypropionamide (PAM) were studied on different slopes (5 掳~ 10 掳~ 15 掳~ 20 掳~ 20 掳~ 25 掳). The results showed that: (1) the tillage displacement of slope land with different gradient after PAM addition was significantly lower than that of the control (no PAM), was added), and the tilling displacement decreased significantly by 49.16% and 67.96% in the slope of 20 掳and 25 掳without adding PAM), and (2) compared with the control, there was no significant difference between the two groups. After the addition of PAM to the soil, the content of 0.25mm non-aqueous stable aggregates in 5 掳/ 10 掳/ 15 掳/ 20 掳/ 25 掳slope was reduced by 33.7446.67 and 37.566.56 / 52.7052.50, respectively. The structural damage rate of soil aggregates in different slopes (PAD) decreased by 60.05%, while the mean mass diameter (MWD) and the mean geometric diameter (GMD) increased, respectively. 41.94% and 55.09% respectively. (3) there was a significant positive linear correlation between tillage displacement and PAD. There was a negative linear correlation with MWD and GMD (P0.05). The addition of PAM in sloping soil can effectively reduce the tillage displacement, enhance the stability of soil structure and reduce tillage erosion. PAM can be used to control tillage erosion in steep slope (鈮，
本文编号：2173483
[Abstract]:In order to control tillage erosion of sloping land by chemical measures, the typical sloping farmland in purple soil was used as the research object. The effects of magnetic tracer and simulated tillage on tillage displacement and structure stability of soil aggregates after polypropionamide (PAM) were studied on different slopes (5 掳~ 10 掳~ 15 掳~ 20 掳~ 20 掳~ 25 掳). The results showed that: (1) the tillage displacement of slope land with different gradient after PAM addition was significantly lower than that of the control (no PAM), was added), and the tilling displacement decreased significantly by 49.16% and 67.96% in the slope of 20 掳and 25 掳without adding PAM), and (2) compared with the control, there was no significant difference between the two groups. After the addition of PAM to the soil, the content of 0.25mm non-aqueous stable aggregates in 5 掳/ 10 掳/ 15 掳/ 20 掳/ 25 掳slope was reduced by 33.7446.67 and 37.566.56 / 52.7052.50, respectively. The structural damage rate of soil aggregates in different slopes (PAD) decreased by 60.05%, while the mean mass diameter (MWD) and the mean geometric diameter (GMD) increased, respectively. 41.94% and 55.09% respectively. (3) there was a significant positive linear correlation between tillage displacement and PAD. There was a negative linear correlation with MWD and GMD (P0.05). The addition of PAM in sloping soil can effectively reduce the tillage displacement, enhance the stability of soil structure and reduce tillage erosion. PAM can be used to control tillage erosion in steep slope (鈮，
本文编号：2173483
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