碱茅草在不同浓度盐溶液灌溉下的蒸发蒸腾作用  

EVAPOTRANSPIRATION OF PUCCINELLIA CHINAMPOENSIS IRRIGATED WITH SALTY WATERS

作　　者：万长贵[1] 邹琇莹[1] 

机构地区：[1]甘肃草原生态研究所

出　　处：《草业科学》1990年第2期14-19,共6页Pratacultural Science

基　　金：甘肃省自然科学基金会资助

摘　　要：本文报导了生长在盐土上的碱茅草在盐溶液和对照处理下的蒸发蒸腾作用。在供水相同的情况下,碱茅草的水分蒸散与盐溶液的浓度成负相关。植物水分蒸散量的大小受到土壤中盐分积累量的制约。当土壤含盐量由原来的1.13％增加到1.33％以上时,植物水分蒸散量即会显著减少(P<0.05),当土壤含盐量达到2.5％时,碱茅草水分蒸散量和生物量均大为下降,盐害症状较明显。这一土壤含盐量似乎代表了碱茅草耐盐的极限。碱茅草受到水分胁迫时,对照植物的水分蒸散量与盐溶液处理者无显著差异,说明碱茅草对土壤水分亏缺较为敏感。This paper reported evapotranspiration of Puccinellia chinampoensis growing on a saline soil under irrigation with different salt solutions and plain water. In condition of equal water supply, evapotranspiration of P. chinampoensis was negatively correlated with salt concentration of the irrigated water. Evapotranspiration of the plant waw controlled by amount of salt accumulated in the soil. When soil salinity had increased from original 1.13％ to 1.33％ and above, evapotranspiration of the plant decreased significantly(P<0.05). When soil salinity had reached 2.5％, evapotranspiration and biomass declined dramatically and the plant showed apparent symptoms of growth inhibition. This salinity level seems to represent the upper limit of salt tolerance for the plant. When the plant suffered water stress, there was no significant difference in evapotran spiration between control plants and salt—treated plants which indicated a sensitive response of the plant to soil water deficits.

关 键 词：盐渍土改良 碱茅草 蒸发蒸腾 

分 类 号：S156.49[农业科学—土壤学]