【摘要】：為定量描述脫硫石膏施用下鹽化堿土土壤剖面鹽分與淋洗水量的關(guān)系,通過(guò)室內(nèi)土柱淋洗試驗(yàn)開展了脫硫石膏施用下不同淋洗水量對(duì)寧夏鹽化堿土水鹽運(yùn)移影響的研究。結(jié)果表明:施用脫硫石膏對(duì)增加水分入滲和降低0—20cm土層土壤pH、鹽分含量產(chǎn)生了積極影響,土壤脫鹽率84.39%~95.41%,但較大水量的淋洗有可能會(huì)加劇土壤堿化。連續(xù)淋洗條件下,最大脫鹽深度位于60—80cm土層。脫硫石膏施用下,0—20cm土層Cl~-、Na~+溶脫率隨淋洗水量的增加變化不大,低淋洗水量下,SO_4~(2-)溶脫率低于Na~+和Cl~-,高淋洗水量下,3種離子溶脫率接近;20—40cm土層主要鹽分離子溶脫率由大到小依次為Cl~-、SO_4~(2-)、Na~+,各離子脫鹽率隨淋洗水量的增加先增加較快后趨于平緩。當(dāng)淋洗水量達(dá)到60cm時(shí),SO_4~(2-)和Na~+在80—100cm土層累積,Cl~-則運(yùn)移至100cm土層以下。
[Abstract]:In order to quantitatively describe the relationship between salt content and leaching water quantity of salinized alkali soil under desulphurization gypsum application, the effect of different leaching amount of desulphurization gypsum on water and salt transport of salinized alkali soil in Ningxia was studied by indoor soil column leaching test. The results showed that the application of desulphurization gypsum had a positive effect on increasing water infiltration and reducing pH, salt content in 0-20cm soil layer. Soil desalination rate was 84.39% 鈮，

本文編號(hào)：2515779