Effects of Water-Retaining Agent Combined with Exogenous Substances on Plant Growth and Soil Nutrients in Reclaimed Land of Mining Area
In order to explore the effective measures to improve the reclaimed land in the loess area,this study set four additives,namely,cow dung,chicken manure,green manure and microbial inoculum,and 10 treatments with water-retaining agent.Field experiments were con-ducted to study the characteristics of plant growth and soil nutrients under different treatments,in order to find out whether the addition of wa-ter-retaining agent can cooperate with exogenous additives to have a positive impact on the reclamation in the mining area.The results showed that:Most exogenous additives combined with water-retaining agent can promote the growth of Astragalus mongholicus in different degrees,and water-retaining agent combined with cow dung and chicken manure can promote the increase of plant height and biomass of A.membranaceus,but the opposite is true under the application of microbial agents;Water-retaining agent combined with chicken manure and green manure can increase the root diameter of two-level roots.Water-retaining agent combined with organic fertilizer can increase soil organic matter and nitro-gen content,while microbial agent treatment is not conducive to increase soil organic matter and nitrogen content;The application of water-re-taining agent combined with cow manure and chicken manure decreased the total phosphorus content in soil,and the water-retaining agent combined with green manure and microbial inoculants could increase the total phosphorus content in soil,which had the opposite effect on available phosphorus.Comprehensive evaluation and analysis showed that water-retaining agent cooperated with green manure and microbial inoculum can promote the growth of A.membranaceus,and water-retaining agent cooperated with microbial inoculum can also improve soil nu-trients.Without water-retaining agent,most growth indexes of A.membranaceus were negatively correlated with soil total phosphorus and avail-able phosphorus;Under the treatment of adding water-retaining agent,most growth indexes of A.membranaceus were only negatively correlated with soil total phosphorus.To sum up,water-retaining agent and microbial inoculum can promote the growth of A.membranaceus and improve soil nutrients,but the soil fertility level after improvement is still low,so it is suggested that the amount of exogenous additives should be in-creased in actual production.
万方数据
维普
