准噶尔盆地城市新建防护绿地土壤养分和盐分的变化

The Changes on Soil Nutrients and Salinity of Protective Greenbelt in City of Junggar Basin

研究了克拉玛依市区北郊新建防护绿地及相邻荒漠区的土壤养分及盐分。结果表明:防护绿地土壤养分较荒漠区有明显提高,尤其是土壤N素含量增加明显;防护绿地与荒漠区相比,总盐含量增加明显,达90.8%;土壤pH值下降了0.98,由强碱性土壤变为碱性土壤;主要离子组成略有变化,由荒漠区的4种变成防护绿地的2种,且可溶性盐主要集中在40-60 cm深度。在垂直方向上,有机质及速效养分主要集中在土壤表层;无论防护绿地还是荒漠区,土壤养分随土层深度的增加而减少。

The effects of the greenbelt system on soil characteristics are evaluated in peri-urban Karamay. The emphasis in this paper is to measure the soil nutrients and salinity properties between protective greenbelt and desert zone. The results indicate that the soil nutrients at the protective greenbelt are improved noticeably than the one of desert zone, especially nitrogen matter content of the soil. The total salt content sig- nificantly increased, reaching 90. 8%, compared with the greenbelt and the desert zone. The soil pH decreased by 0. 98, from the strong alkaline soil into alkaline soil. There are slight changes in the main ion composition which from 4 of the desert zone to 2 of the greenbelt, and soluble salt mainly concentrated in the 40--60 cm. In the vertical direction, organic matter and available soil nutrients are mainly at the surface of the soil, and the soil nutrients reduced along with the increasing of soil depth, regardless of the greenbelt or the desert zone.