摘要
在中国农业大学塞北草业科学实验站,对种植3年的多年生禾本科牧草新麦草Psathyrostachys uncea、无芒雀麦Bromus inermis、蓝茎冰草Agropyron cristatum和一年生饲料作物燕麦Avena sativa对土壤物理性状的影响进行了研究,试验表明,生长第3年从春季到秋季,0～10,10～20,20～30 cm多年生禾本科牧草草地土层中,土壤容重平均降低9.29%,8.64%,6.38%.从7月开始,多年生禾本科牧草草地土壤含水率明显高于燕麦地.生长第3年从春季到秋季0～10 cm土壤,多年生牧草使土壤孔隙度平均增加6.45%,燕麦地减小了1.04%;10～20 cm,多年生牧草使孔隙度平均增加7.15%,燕麦地增加了1.49%.0～30 cm土层中,≥0.25 mm土壤团聚体总数,多年生牧草平均为73.89%,比燕麦地(平均为65.44%)高8.45%.
Abstract
The effects of Russian wildrye, smooth brome and crested wheatgrass, as well as oat were planted in Saibei Working station. The effects of perennial and annual grasses on soil physical properties were studied after 3 years. The results indicated that after a period of growing season in the third year, soil bulk density decreased 9. 29% ,8. 64% ,6. 38% in depth of 0 ~ 10 cm,10 ~ 20 cm,20 ~30 cm, respectively. Soil water content was clearly higher in perennial grass plots than that in oat plots. Soil total porosity in perennial grass plots increased 6. 45% in 0~10 cm soil, while reduced1. 04% in oat plots. In 10 ~20 cm soil, total porosity increased 7. 15% in perennial grass plots and 1. 49% in oat plots. The soil total number of ≥ 0. 25 mm aggregates in 0 ~ 30 cm was 8. 45% higher in perennial grass plots (averagely 73. 89%) than that in oat plots(averagely 65. 44%).
国家科技期刊平台
NSTL
维普
万方数据