【摘要】：為了采用化學(xué)措施防治坡地耕作侵蝕,以紫色土典型坡耕地為研究對(duì)象,采用磁性示蹤和模擬耕作等技術(shù)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團(tuán)聚體結(jié)構(gòu)穩(wěn)定性的影響。結(jié)果表明:(1)添加PAM后不同坡度坡地耕作位移均明顯低于對(duì)照(未添加PAM),其中在20°和25°坡面顯著減少了49.16%和67.96%;(2)與對(duì)照相比,土壤中添加PAM后0.25mm非水穩(wěn)定性團(tuán)聚體含量在5°,10°,15°,20°,25°坡度分別減少了33.74%,46.67%,37.56%,52.70%,62.50%,不同坡度土壤團(tuán)聚體結(jié)構(gòu)破壞率(PAD)平均降低了60.05%,而平均質(zhì)量直徑(MWD)和平均幾何直徑(GMD)值分別增加了41.94%和55.09%;(3)耕作位移量與PAD值呈顯著的正線性相關(guān)性,而與MWD和GMD值呈負(fù)線性相關(guān)性(P0.05)。坡地土壤添加PAM后可以有效降低耕作位移量,增強(qiáng)土壤結(jié)構(gòu)穩(wěn)定性,減少耕作侵蝕。在農(nóng)業(yè)生產(chǎn)中PAM可用于控制較陡(≥20°)坡地的耕作侵蝕。
[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 擄~ 10 擄~ 15 擄~ 20 擄~ 20 擄~ 25 擄). 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 擄and 25 擄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 擄/ 10 擄/ 15 擄/ 20 擄/ 25 擄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，

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