咸水滴灌对沙漠公路防护林土壤环境的影响

Effect of drip-irrigation with salinity water on soil environment of the Trim Desert highway shelterbelt

为了研究高矿化度水滴灌对极端干旱区防护林土壤环境的影响,为塔里木沙漠公路防护林生态工程的可持续利用和维护管理提供理论依据。该文以塔克拉玛干沙漠腹地4.0～4.8 g/L的高矿化度地下水滴灌下的防护林为例,分析了咸水滴灌前后0～30 cm各层风沙土全N、全P、有机质、全盐、离子组成和微生物的变化。结果表明:高矿化度咸水滴灌下塔里木沙漠公路防护林的土壤环境逐渐得到改善。防护林0～5 cm、5～15 cm和1～30 cm 3个层次的含水量、全N、全P、全K、全盐含量、离子组成和微生物数量与流沙地存在很大差异,且与灌溉年限有直接关系;其中0～5 cm层次变化最为明显,5～15 cm次之,15～30 cm变化最小。

To study the effect of drip-irrigation with high salinity groundwater on aeolian sandy soil environment of shelterbelt in the hinterland of the Taklimakan Desert, and supply theoretical basis for the sustainable use and management of the Tarim Desert highway shelterbelt eco-project. The shelterbelt drip-irrigated with salinity groundwater of 4.0-4.8 g/L in the hinterland of the Taklimakan Desert was taken as an example. Changes of, total nitrogen, total phosphorus, organic matter, total salt content, ions composition, and microorganism of the 0-30 cm soil layers were analyazed, The results showed that the soil environment of the Tarim Desert highway shelterbelt became better under drip-irrigation with high salinity groundwater. Water content, total nitrogen, total phosphorus, organic matter, total salt content, ions composition, and microorganisms of the 0-5 cm, 5-15 cm and 15-30 cm aeolian sandy soil layers in shelterbelt were greatly different from drifting sandy land, and were related with irrigation years. These characteristics of 0-5 cm layer changed most obviously, then 5-15 cm layer, and the 15-30 crn layer changed directly least.