有机物料对沙蒿生物炭改良沙土中有效养分的增效作用

Synergy of Organic Material on Amlioration of Artemisia ordosica Biochar on Sandy Soil Available Nutrients

研究有机物料对沙蒿生物炭改良沙土有效养分的影响,为沙蒿生物炭改良瘠薄沙土提供依据。采用无植物室外培养模拟试验,研究单独添加生物炭、生物炭与有机物料混合对沙土有效养分含量、pH和微生物生物量碳、氮含量的影响。结果表明：不同有机物料均能够提高沙土的pH（沙蒿粉除外）、有效养分和微生物生物量碳、氮含量,有机物料与生物炭混合施用对沙土的有效磷、速效钾和微生物生物量碳、氮起到了增效作用,较二者单独施用的累加效果分别高出7.1%~23.1%、4.1%~10.9%、6.2%~11.8%和12.5%~22.6%。pH和微生物生物量碳、氮含量影响着沙土的有效养分含量,与其呈显著或极显著正相关关系。因此,沙蒿生物炭改良沙土过程中施入有机物料对有效养分的提高可起到增效的作用,这可能与有机物料和生物炭混合施用能够提高沙土中微生物数量和活性有关。

For providing scientific basis by using Artemisia ordosica biochar to improve barren sandy soil, an outdoor- incubation simulation experiment with plant-free was conducted to understand the synergy of organic materials on amelioration of Artemisia ordosica biochar on sandy soil available nutrients. The results showed that except Artemisia ordosica powder powder, organic materials or Artemisia ordosica biochar increased sandy soil pH, available nutrients, microbial biomass C and N. Organic materials had synergy in increasing soil available P and rapid available K, and microbial biomass C and N when compounded with Artemisia ordosica biochar, the cumulative effect were 7.1%-23.1%, 4.1%-10.9%, 6.2%-11.8%, 12.5%-22.6% higher than separate application of organic material or .4rtemisia ordosica biochar, pH and microbial biomass C and N had significant correlations with sandy soil available nutrients. The synergy of organic materials may be attributed to its enhancement of microbial quantity and activity.