摘要
探讨了放牧利用对草地年地上净生产力的影响：（１）放牧对被采食植物个体或构件的生长速率和生产存在着正负两个方向的直接影响，是否增加生物量积累取决于这两种正负机制的平衡；（２）除对被采食个体有直接影响外，放牧还间接影响着群落中其他未采食同种个体或其他种群的生长和生产力；（３）放牧对草地地上净生产力的生产是否有刺激作用，即假说是否成立取决于直接和间接影响的综合作用，而它们又与草地放牧前后的状况和环境条件密切相关，也与草地的利用历史有较大的关系。
The effect of the grazing on the
aboveground net primary productivity of grassland was focused on, the results were as
followings: (1) There were several mechanisms by which grazing can have positive and
negative effects on the subsepuent growth rate and production of the grazed plant or modular,
which determine whether grazing increase the accumulated biomass according to the direction
of the net effect; (2) Besides the direct effect on the grazed plant or modular, grazing indirectly
influenced the other plants in the positive and compensatory direction; (3) Whether grazing can
increase the ANPP of grassland or the grazing optimazation hypothesis was correct depended
on comprehensive affect of direct and indirect effect and is of relevance to the condition and
environment of the grassland before and after being grazed and the utilization history.
出处
《中国草地》
CSCD
1999年第4期61-66,共6页
Grassland of China
基金
农业部草地资源生态实验室资助
国家自然科学基金
关键词
放牧优化
草地
地上净生产力
Grazing
\ Grassland
\ Aboveground net primary productivity
\ Optimization
hypothesis
