摘要
对紫色土旱稻免耕中土壤动物群的变化研究表明、旱稻免耕有利于土壤动物生长繁殖。免耕垄作比平作土壤动物增加5种,每立方米增加3118个,其优势种的数量增加50％,并集中在0～20cm 土层内,占总量的95％。免耕不施肥覆盖比不覆盖的土壤动物增加1175个/m^3。免耕施有机肥和化肥,垄作比平作的土壤动物分别增加5895个/m^3、2902个/m^3。垄作施有机肥比施化肥和不施肥的土壤动物分别增加5864个/m^3和7655个/m^3,其优势种数量分别增加30％～190％和110％～440％。同时,土壤动物的活力使土壤容重降低4％～12％,氮磷含量增加0.001％～0.005％,谷物产量增加4％～9％。
The non-tillage cropping system was proved beneficial for the growth and multiplica- tion of soil animals in an experiemnt where upland rice was cultivated in purple soil.Five more species of soil animals were found in ridged non-tillage culture than in level culture and their number increased by 3118 individuals/m^3.The population of the dominant spe- cies increased by 50% and 95% of them were found in 0-20 cm horizon.The population of soil fauna increased by 1175 individuals/m^3 in mulch treatment than in non-mulch control when both were without fertilizer application and tillage.In non-tillage treatments with chemical fertilizer and organic manre,the population of soil fauna increased by 5895 and 2902 individuals/m^3,respectively,in ridged culture than in level culture.In ridged culture treatments,manure seemed beneficial for the soil fauna,its population increased by 5864 or 7655 individuals/m^3 than treaments with fertilizer or without any fertilizer,respectively, and the population of the dominant species increased by 30-190% and 110-440%.Because of the activity of soil animals,the volume weight of the soil decreased by 4-12%,the con- tents of N and P increased by 0.001-0.005%,and the yield increased by 4-9%.
出处
《西南大学学报（自然科学版）》
CAS
CSCD
1993年第3期14-18,共5页
Journal of Southwest University(Natural Science Edition)
关键词
土壤动物
紫色土
免耕
陆稻
purple soils
soils animals
no-tillage
dryricc
