Zhang Jianguo, Xu Xinwen, Lei Jiaqiang, Li Shengyu
College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi China ; Xinjiang Institute of Ecology and Geography, CAS, Urumqi, Xinjiang China.
Xinjiang Institute of Ecology and Geography, CAS, Urumqi, Xinjiang China.
Springerplus. 2013 Dec 11;2(Suppl 1):S5. doi: 10.1186/2193-1801-2-S1-S5. eCollection 2013.
Soil salt crusts are special layers at soil surface which are widely distributed in the Trim Desert Highway Shelterbelt under drip-irrigation with high salinity groundwater. In order to reveal annual variation of their chemical characteristics, soil salt crusts in shelterbelt of different ages in hinterland of the Taklimakan Desert were sampled. SOM, total salt, inions and pH were analyzed. Following results were obtained. SOM of salt crusts increased with the shelterbelt ages, but increasing trend became lower gradually. Total salt, ions, and pH of salt crusts reduced gradually with the shelterbelt ages. Total salt of salt crusts in shelterbelt of different ages was much higher than shifting sandy land. Ions were higher than shifting sandy land, Cl(-), Na(+), and SO4 (2-) increased more obvious, then Mg(2+), K(+), Ca(2+) and HCO3 (-), CO3 (2-) was little and nearly had no change. pH was all alkaline, pH of salt crusts in shelterbelt of 11 years was even lower than shifting sandy land. We can include that the quality of shallow soil (0~30 cm) in the Trim Desert Highway Shelterbelt becomes better gradually.
土壤盐结皮是土壤表层的特殊层次，广泛分布于塔里木沙漠公路滴灌高矿化度地下水防护林带下。为揭示其化学特征的年际变化，对塔克拉玛干沙漠腹地不同林龄防护林带的土壤盐结皮进行了采样，分析了其中的土壤有机质（SOM）、全盐量、离子及pH值，结果如下：盐结皮的SOM含量随林龄增加而升高，但增幅逐渐变小；盐结皮的全盐量、离子含量及pH值随林龄增加而逐渐降低。不同林龄防护林带盐结皮的全盐量远高于流沙地；离子含量高于流沙地，其中Cl⁻、Na⁺和SO₄²⁻增加较为明显，其次是Mg²⁺、K⁺、Ca²⁺和HCO₃⁻，CO₃²⁻含量很少且几乎无变化；pH值均呈碱性，11年林龄防护林带盐结皮的pH值甚至低于流沙地。由此可知，塔里木沙漠公路防护林带下浅层土壤（0~30 cm）质量逐渐变好。
