渭北黄土高原植被恢复模式对土壤理化特性的影响

Effects of Vegetation Restoration Patterns on the Physical and Chemical Properties of Soil

本研究以撂荒地、沙棘灌木林地以及刺槐、侧柏和油松人工林地为研究对象,并以农田作为对照,通过分析草地、灌木和乔木林地三种植被恢复模式对土壤养分、物理特性和土壤微生物量碳、氮的影响,探究不同植被恢复模式对土壤理化性质的影响。结果表明:与农田土壤相比,三种植被恢复模式均显著改变了土壤养分状态、化学计量、物理特性和微生物量碳氮含量,且其影响同时受地被植物特性的影响;植被恢复降低了土壤速效磷含量、土壤容重和pH;与人工林植被恢复相比,撂荒地具有较高的土壤和微生物碳、氮含量,表明其碳和氮养分循环更易受到磷元素的限制。

The different land use as abandoned land,sea buckthorn plantation.Robinia pseudoacacia plantations,Platycladus orientalis plantations and Pinus tabuliformis plantations were studied regarding the soil nutrients in three categories:grassland,shrubs and arbor tree lands The results showed that different vegetation restoration patterns influence soil nutrients structure,chemical quantity,physical properties,and carbon and nitrogen content in soil microbes,and the extent to which they were affected by vegetation characteristics.Vegetation restoration reduced the content of soil available phosphorus,soil density and pH value.Compared with the plantation pattern,abandoned land had higher soil and microbial carbon and nitrogen content,and carbon and nitrogen nutrient cycles were more likely to be restricted by phosphorus.