摘要
以白龙江干旱河谷3类典型岩生植物为对象,采用野外实地观测和室内浸水法,研究其持水性能。结果表明:岩生植物吸水速率(WA)随浸泡时间(t)增加按方程WA=atb的趋势下降,持水率(WR)随浸泡时间(t)延长而极显著地先快速增加后增加不明显(WR=aln t+b),在相同浸泡时间后,苔藓(Bryophyta spp.)的吸水速率和持水率均大于卷柏(Selaginella tamariscina)和瓦松(Orostachys fimbriatus)。岩生植物种类对其储量、最大持水率、有效拦截量有极显著影响,瓦松储量最高(达0.91t/hm2),卷柏次之(0.72t/hm2),苔藓储量最低(仅0.28t/hm2);从吸水性能来看,最大持水率的顺序是苔藓(475.75%)>卷柏(242.13%)>瓦松(126.57%);卷柏的有效拦截量最高,可达0.72t/hm2,苔藓和瓦松分别为0.60和0.13t/hm2。就增加白龙江干旱河谷水源涵养能力而言,卷柏优于瓦松和苔藓。
By field survey and water immersion, water holding capacities of rock plant species in the dry valley of Bailongjiang river were studied. The results showed that： （1）The water holding capacity of rock plant species increased logarithmically（WA =atb） with time immersed in water. The water absorption rates of these were similar, however lower under the Bryophyta spp. ; water absorption rates of rock species decreased according to equation WR =aln t＋b with immersed time. The water absorption rate and water holding capacity of Bryophyta spp. were higher than that of Selaginella tamariscina and Orostachys fimbriatus. （2） The storage of Bryophyta spp. was 0. 28 t/hme, the maximal water holding capacity was 447.75%, the efficiency water retain capacity was 0. 60 t/hmz, for Orostachys fimbriatus, it had the highest storage, which was 0. 91 t/hm2 , and the lowest maximal water holding capacity was 126.57%, and the efficiency water retain capacity was 0.13 t/hm2 , for Selaginella tarnariscina, it had the highest efficiency water retain capacity, which was 0.72 t/hm2 , and indicated that it was the best species in dry valley of Bailongjing river for water holding.
出处
《水土保持学报》
CSCD
北大核心
2014年第1期102-105,共4页
Journal of Soil and Water Conservation
基金
甘肃省科技支撑计划项目(090NKCK119)
关键词
白龙江
干旱河谷
岩生植物
持水能力
Bailongjiang river
dry valley
rock plant species
water holding capacity
