摘要
利用盆栽试验,对宁夏南部地区3种主要牧草的蒸散量进行了对比研究,结果表明,在生长季中后期人工牧草苜蓿蒸散量的日平均值为4.15mm,分别比芨芨草和长芒草高出24.34%和29.88%。芨芨草由于植株形体高大,其植物蒸腾耗水量相应也较大,故在生长季内总的蒸散量高于长芒草;然而在生长季末由于植物几乎无蒸腾作用而使其总蒸散量略低于长芒草。3种草本植物的蒸散量与土壤含水量呈高度相关,并在此基础上建立了回归方程。
The evapotranspiration of three herb species, all of which distributed in the southern areas of Ningxia, were researched in potted conditions. The results indicated that the average value of daily evapotranspiration of Medicago sativa reached 4.15 mm, which was by 24.34% and 29.88% higher than Stipa bungeana and Achnatherum splendens respectively. The study also showed that the value of evapotranspiration of Stipa bungeana was higher than Achnatherum splendens because the transpiration of the former specie was stronger than the latter in growth seasons, and the value of the former was smaller than the latter because the plants had no transpiration out of growth seasons. At last, it was showed that the evapotranspiration of three herb species were highly correlative to soil water content, and the regression equations were constructed accordingly.
出处
《水土保持学报》
CSCD
北大核心
2003年第1期170-172,共3页
Journal of Soil and Water Conservation
基金
国家自然科学基金重点项目"干旱半干旱地区森林与水资源的相互影响及合理调控机理(30230290)"
国家科技部社会公益研究专项资金项目(2001-82)
国家"十五"科技攻关项目(2001BA510B02-06)
