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为了探讨干旱区灌区不同土地利用方式下盐碱化土壤剖面pH值与土壤水分和养分之间的关系,测定河套永济灌域荒地、林地、农田3种土地利用方式下0~20、20~40、40~60、60~80、80~100cm剖面土壤pH值、含水率(SMC)、有机质(OM)、总氮(TN)、Zn、Cu的含量。结果表明:土壤pH值平均值为9.13;土壤含水率2.96%~31.35%;土壤OM、TN含量平均值分别为11.30、0.49g·kg~(-1);微量营养元素Zn、Cu平均值分别为107.20、32.78mg·kg~(-1),是相应背景值的1.9、1.7倍;3种土地利用方式下,土壤pH值差异性极显著(P<0.001),高低顺序为荒地>农田>林地,在垂直剖面含量差异并不显著(P>0.05);3种土地利用方式下,土壤pH值主要受TN含量的影响,回归方程为Y_(pH)=9.336-0.409 X_(TN)(P=0.001);表层(0~40cm)土壤pH值在一定程度上受Cu含量的影响,回归方程为Y_(pH)=0.018 X_(Cu)+8.523(P=0.003)。在河套永济灌域,一方面土壤碱化会导致土壤养分含量的贫瘠,另一方面施肥等农业活动在一定程度上降低了土壤表层碱性,同时造成微量元素的累积,加重土壤碱性的作用也非常显著,因此在增加农业投入的同时应合理科学地施用农药化肥。
In order to discuss the relationship between pH value of soil salinity and soil water content and nutrient under different land use patterns in arid irrigated area, the effects of land use types such as wasteland, woodland, The soil pH value, moisture content (SMC), organic matter (OM), total nitrogen (TN), Zn and Cu contents in 40, 40-60, 60-80, 80-100 cm sections were studied. The results showed that the average soil pH value was 9.13 and the soil moisture content was 2.96% ~ 31.35%. The average contents of soil OM and TN were 11.30 and 0.49 g · kg -1, respectively. The average values of trace elements Zn and Cu were (107.20 and 32.78 mg · kg -1), respectively, 1.9 and 1.7 times of the corresponding background values. Under the three land use types, the soil pH value was extremely significant (P <0.001) (P> 0.05). Under the three land use types, the soil pH value was mainly affected by TN content, and the regression equation was Y_ (pH) = 9.336-0.409 X_ (TN) (P = 0.001). The soil pH value of the surface layer (0 ~ 40cm) was affected by Cu content to a certain degree. The regression equation was Y_ (pH) = 0.018X_ (Cu) +8.523 (P = 0.003). In Hetao Yongji Irrigation District, on the one hand, soil alkalization will lead to poor soil nutrient content. On the other hand, fertilization and other agricultural activities will reduce the surface alkalinity of the soil to a certain extent, at the same time, cause the accumulation of trace elements and aggravate the alkalinity of the soil The role is also very significant, so while increasing agricultural inputs should be reasonable and scientific use of pesticides and fertilizers.