摘要
为进一步认识半干旱黄土丘陵沟壑区引种能源植物柳枝稷生态效益的实现和生物质生产的可持续性,通过多尺度、多因素的土壤养分和水分供求关系格局识别,对引种柳枝稷的生态适宜性进行了初步分析.研究发现,山地柳枝稷自然维持状态下,无论生产还是生态效益的发挥,都处于一种极其低效的水平.柳枝稷水土保持机制主要体现在土体固持和地表径流拦蓄方面,但是对表土的直接保护能力较差.相对于当地主要植被类型,山地柳枝稷并未体现出土壤水分和养分供给与利用上的引种生物特殊性,景观物理性因素主导着当前山地植被水土关系过程.土壤表层速效氮含量可能是制约山地柳枝稷生产和生态效益发挥的关键因素.通过生长节律的适应,白羊草在山地表现出更为安全、高效的生物质生产属性.立足水土保持效益的充分发挥,通过种植制度和利用方式的优化,保证限制性资源的利用和储蓄平衡,稳定复合生产群体布局,有可能实现柳枝稷生态和生产效益的兼顾.
To deeply understand the ecological benefit and sustainable biomass production of introduced switchgrass in semi-arid loess holly-gully areas, we made a preliminary study of the eeological adaptability of the plant by identifying the supply-demand patterns of soil nutrients and soil water under multi-scaling and multi-factor conditions. Both the production and ecology benefits of switchgrass on the upland are low under natural-surviving conditions. Fixing soil body and intercepting surface runoff are its main mechanisms of water and soil conservation, but it has poor ability to protect the surface soil. Compared with that of the local vegetation types, the bio-articularity of switchgrass has not been expressed for the supply-de- mand patterns of soil nutrients and soil water, which is still controlled by landseape factors. The content of readily available nitrogen might be the main limiting factor for the achievement of ecological benefits of switchgras. Early-maturing switchgrass in lowland and old world bluestem in upland attain safer and more efficient biomass-production, by their adaptation in growth rhythm. It might be feasible to achieve its ecological and production benefit at the same time, based on the first benefit of water and soil conservation, through the optimization of production and utilization system, the balance between utilization and storage of limited resources, and the stable patterns of multi-population.
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第7期125-132,共8页
Journal of Southwest University(Natural Science Edition)
基金
973项目"农业生物多样性综合应用模式与方法"资助项目(2006CB100200)
关键词
柳枝稷
生物质生产
水土保持
生态适宜性
Panicum virgatum
biomass production
water and soil conservation
ecological adaptability
