华北农牧交错带种植禾本科牧草对土壤N、P、K的影响

Effects of planting grass on soil N,P and K in Agro-pastoral transitional zone of north China

于2004年在中国农业大学塞北草业科学实验站(河北省张家口塞北管理区,沽源),研究种植4年的多年生禾本科牧草新麦草Psathyrostachys juncea、无芒雀麦Bromus inermis、兰茎冰草Agropyron smithii和一年生饲料作物燕麦Avena sativa对土壤化学性状的影响。试验表明,生长第4年从春季到秋季,多年生牧草草地比燕麦地土壤全氮含量0-10 cm土层中高0.07%,10-20 cm土层中高0.11%,20-30 cm土层中高0.09%。7月由于受施肥的影响,0-20 cm土层燕麦地土壤全磷含量较其它牧草地高,6-9月燕麦地全磷含量均较其它牧草地低,且差异显著。多年生草地间比较,无芒雀麦草地土壤全磷含量最高。同一生长时期,同一土层多年生牧草地土壤速效钾含量均大于燕麦地,且差异显著(P<0.05)。

The effects of planting 4 years of Bromus inermis, Agropyron smithii, Psathyrostachys juncea and oat on soil chemical properties was studied in CAU research station, Saibei Administration District,Zhangjiakou,Hebei, Guyuan. The results showed that from spring to autumn in the fourth year, compare to oat, total nitrogen in 0-10 cm soil in perennial grass was 0.07% higher, 0. 11% higher in 10-20 cm and 0.09% higher in 20-30 cm. After fertilization in July, total phosphorous in 0-20 cm oat soil was higher than in other perennial grass plots, while in June, August and September, total phosphorous in oat plots was significantly lower. Among 3 perennial grass plots, Bromus inermis gave the highest total phosphorous content. In the same growing period, soil available potassium in perennial grass plots was significantly （P〈0.05）higher than that in oat.