摘要
利用张力计测定和人工控制土壤水分的方法 ,研究了不同浓度保水剂 (聚丙烯酰胺 )对土壤保水特性和刺槐苗木的影响 .结果表明 ,在低吸力范围 ,随保水剂用量的增加 ,有效水含量增加、土壤持水容量增大、毛管持水量提高幅度大于凋萎系数提高幅度、土壤有效水容量明显提高 .保水剂可影响光合速率和蒸腾速率的日变化进程 ,提高水分利用效率 .0 1%的保水剂可显著改善土壤有效水的保持和供应 .
By means of tension meter and controlled soil water, a study was conducted on the water-retaining properties and the effect on locust (Robinia pseudoacacia) nursery stocks after water-retaining agent (polyacrylamide) was applied in different dosages. Results showed that in the lower soil suction, soil moisture-holding capacity was enhanced with the increase of water-retaining agent, so did the amount of available water, though the wilting coefficient of soil tended to increase, its amplitude was lower. Compared with it the increasing of the capillary porosity was more apparent, so the soil available water capacity augmented obviously. Water-retaining agent could improve the efficiency of water utilization through the effect on daily rhythm of photosynthesis rate and transpiration rate. Applying 0.1% polyacrlamide into soil could significantly increase the water retaining and supplying ability of soil.
出处
《北京林业大学学报》
EI
CAS
CSCD
北大核心
2003年第2期14-17,共4页
Journal of Beijing Forestry University
