草炭对砂质土壤保水特性的影响  

Effects of peat on water conserving properties of sandy soil

作　　者：秦玲[1] 魏钦平[2] 李嘉瑞[3] 王小伟[2] 刘军[2] 

机构地区：[1]河北科技师范学院生命科学系,秦皇岛066000 [2]北京市农林科学院林业果树研究所,北京100093 [3]西北农林科技大学园艺学院,杨凌712100

出　　处：《农业工程学报》2005年第10期51-54,共4页Transactions of the Chinese Society of Agricultural Engineering

基　　金：北京市农委资助项目(20030112);北京市科委资助项目(H030730050130)

摘　　要：通过比较草炭、砂土、草炭-砂土混合基质水物理特性和3种灌溉频率条件下基质蒸发量和水势的变化,分析了草炭对砂质土壤保水特性的影响。研究结果表明:用腐质化程度低的高位草炭改良砂土,改良基质的孔隙度、田间持水量、饱和含水率显著增加,基质保水能力提高;干旱处理过程中体积收缩程度也随基质中草炭含量的增加而增大。灌溉频率对基质蒸发量和水势也有显著影响,随着灌溉频率的增加,基质中草炭含量越高,表面蒸发越快。用较低的灌溉频率,纯草炭仍能保持更多的水分,为植物提供更多的有效水。Hydrophysical characteristics of peat, sand, peat-sand mixed media and evaporation and water potential under three irrigation conditions were compared. Effects of peat on water conserving properties of sandy soil were analyzed. The results showed that through utilizing low-humified sphagnum peat to amend sandy soil, the total porosity, field capacity, saturated capacity were increased, and water retention of the medium was improved. The degree of medium shrinkage was increased with the increase of peat in media. Effect of irrigation frequency on the evaporation and water potential of different media is obvious. The higher the peat content was, the quicker the surface evaporation was along with the increase of irrigation frequency. Using infrequent irrigation, the pure peat retained more available water for the plant growth.

关 键 词：草炭 砂土 土壤改良 保水特性 灌溉频率 

分 类 号：S141.6[农业科学—肥料学]