摘要
在模拟林一草植被恢复模式的遮荫条件下进行，比较分析了扁穗牛鞭草、鸭茅、多年生黑麦草在不同遮荫梯度下的净光合速率和收获生物量。结果表明，扁穗牛鞭草在不同遮荫状态下净光合速率占全光下的23．8％～72．6％，净光合速率的大小与光照的相关程度较高（r=0．8879）；鸭茅、多年生黑麦与光照强度的相关程度低一些（r=0．6315、0．4677），不同遮荫度下鸭茅和多年生黑麦草的净光合速率分别占其全光照下的68．7％-88％和65．5％-99．3％；在遮荫对几种牧草收获生物量的影响率上也是扁穗牛鞭草最大，鸭茅和多年生黑麦草在相同生长期内，在中低遮荫度下的收获生物量反而有接近或超过全光照下的量的趋势。试验结果对林一草退耕种植模式的牧草选择和长期的培育经营有一定的借鉴性。
In this paper the net photosynthetic rate （Pn） and the biomass of H. compressa （L.f.）, Dactylis glomerata Land Lolium perenne are compared Late under different shading environments by simulatin different planting patterns. Under shading environment, the Pn of H. compressa （ L. f. ） is only 23.8-72.6 % of that without shade, and the correlation level is high between the Pn and the light intensity（r =0.8879）. The same correlation level is only 0.6315 and 0. 4677 respectively for Dactylis glomerata L and Lolium perenne L. For these two plants,the Pn under shading environments are 68. 7%-88% and 65.5% -99.3% of their counterparts without shade. Shading also has the greatest influence on the biomass of H. compressa （L.f.） The biomass of Dactylis glomerata L and Lolium perenne L under slight shading can be very near to or even higher than that without shade. The analysis is useful for choosing forage grass under tree-grass planting patterns.
出处
《四川林业科技》
2006年第3期24-27,共4页
Journal of Sichuan Forestry Science and Technology
基金
国家科技部"十五"重点攻关项目(2001BA606A-06)
关键词
遮荫
净光合速率
生物量
比较
Shading, Net photosynthetic rate,Biomass, Comparison
