多年生黑麦草草地生态系统中放牧强度对草地结构及组织转化的影响

研究了放牧强度对多年生黑麦草人工草地蘖的形态、密度、草地生产率及组织转化的影响。结果表明，重牧条件下蘖密度大于轻牧，而轻牧的单株蘖重大于重牧。重牧划地净生产率大于轻牧，主要是由于轻和手条件下，草地的高的生长率被更高的枯死率所抵消。春夏之交，采用灵活的管理措施，转换放牧强度可以提高草地的生产率。

Effect of grazing intensity on pasture structure and tissue turnover in a perennial ryegrass pasture ecosystem

This paper studies the effect of grazing intensity of the tiller size, tiller density, pastureproductivity and tissue turnover in a perennial ryegrass pasture ecosystem. The resultsshow that hard grazing leads to a greater tiller density and a lesser tiller weight than laxgrazing does. The net productivity is higher under hard grazing, because under conditionof lax grazing, the higher growth rate of pasture is offset by its senescence rate. Thereare advantages to spring-summer pasture production from a flexible pasture management.