关键词: 羊草草甸草原, 热值, 能量积累和分配

Abstract: The studies showed that under no-tillage plus inter-planting rice and wheat, the height of rice stubble remained on the field significantly affected light transmission rate,with an optimal height of 20～30 cm.No-tillage and strawremaining decreased soil temperature at noon in sunny days,but slightly increased it in the morning and evening,led to a less diurnal difference of soil temperature.The average diurnal soil temperature under no-tillage was higher in cloudy but lower in sunny days.Under no-tillage and strawremaining, both the bulk density and the penetration resistance of topsoil increased,but no apparent adverse effect of them was observed on wheat growth.Under no-tillage,soil water content was higher under drought condition,and soil permeability after irrigation was better,which was propitious to the wheat growth.Straw-remaining significantly inhibited weeds,but led to the decrease of basic seedlings and enhanced the damage of freezing.Under no-tillage plus inter-planting,the individuals of effective ears decreased,while the kilo-grain weight increased.The grain yield was slightly but not significantly low under no-tillage plus inter-planting.

Key words: Aneurolepidium chinense grassland, Calorific value, Energy accumulation and allocation