不同牧草对延安地区新造地土壤速效磷的影响

Effects of different forages on available phosphorus in newly created land in Yan’an

通过对延安地区“治沟造地”产生的新造地土壤土质问题的研究,分析不同牧草对新造地土壤速效磷含量的影响。采用室外采样和室内测试相结合的方法,用钼锑抗比色法测定土壤中的速效磷含量,用单因素分析法对数据进行处理。结果表明,在进行生草处理后,土壤速效磷呈现出先增加后降低,各个处理的2021年与2020年的速效磷养分含量几乎持平。在进行牧草播种后,生长期的牧草会对土壤中的速效磷养分进行吸收,会导致土壤中速效磷含量降低。通过比较,在四种牧草中,在生草前期,白三叶对土壤速效磷的积累有促进作用。

Through reviewing the soil quality issues of the newly created land caused by gully treatment for land reclamation in Yan’an,the impact of different forages on the content of available phosphorus was studied.By outdoor sampling and indoor testing with the Mo-Sb colorimetric method,the content of available phosphorus in the target soil was measured and the data was analyzed by single factor analysis.The results showed that after the grass treatment,the content of available phosphorus in the soil increased first and then decreased,with the content of available phosphorus in each treated sample remaining almost the same in 2021 as it was in 2020.After planting,the forages in the growth period absorbed the available phosphorus in the soil,causing the content of available phosphorus in the soil to reduce.Through comparison among the four forages,Trifolium repens could promote the ac⁃cumulation of available phosphorus in the early stage of growth.