【摘要】 通过对荒漠草原4种典型植物群落(蒙古冰草群落、甘草群落、赖草群落、沙蒿群落)枯落物蓄积量的调查,结合室内持水试验,运用数理统计的方法分别得到4种典型植物群落枯落物的蓄积量、最大持水量、吸水速率等水文特征参数。结果表明:荒漠草原不同植物群落枯落物蓄积量在50.8～396.2g/m2,其蓄积量由大到小为蒙古冰草群落>甘草群落>赖草群落>沙蒿群落,与植物群落地上生物量变化是一致的;4种植物群落枯落物最大持水量存在一定差异,蒙古冰草群落、甘草群落、赖草群落、沙蒿群落枯落物最大持水量分别相当于0.934,0.737,0.656,0.230mm的降雨。这4种枯落物最大可吸收其自身重量2.45～3.71倍的降雨;4种植物群落枯落物的持水量与时间呈线性相关,在浸水的前2h枯落物吸水速率最快,随着时间的延长,趋势逐渐变缓,当枯落物在水中浸泡12h时,其持水量基本达到最大值;4种植物群落枯落物吸水速率与时间呈指数相关,在浸水的前2h吸水速率较快,4～12h后逐步减缓。荒漠草原枯落物蓄积、覆盖所引起的水分蓄存与运移已经成为荒漠草原生态系统最为关键的生态过程之一。更多还原

【Abstract】 within investigating and water holding experiment indoors to the four species(Agropyron mongolicum,Glycyrrhiza uralensis,Leymus secalinus,and Artemisia desertorum) of representative plant community in desert steppe,using the methods of the mathematical statistics,and gained the hydrological features parameters including the capita storage,the maximum capita storage of water holding,water absorption rate and etc.The results showed that enclosure and grazing prohibition on the different capita storage of plant community litter had been in 50.8 g/m2 to 396.2 g/m2.The capita storage of the plant community litter was from larger to little as Agropyron mongolicum>Glycyrrhiza uralensis>Leymus secalinus>Artemisia desertorum,and this result was concordant with the variety of aboveground biomass.The maximum capita storage of water holding had some diffeneces on litter of the four plant community.The maximum capita storage of water holding of Agropyron mongolicum,Glycyrrhiza uralensis,Leymussecalinus,and Artemisia desertorum were equivalent to the 0.934,0.737,0.656,0.230 mm depth of rainfall.The maximum capita storage of water holding to fours kinds of litters was 2.45~3.71 times to these weights.The capita storage of water holding showed linear correlation of time.The water absorption rate was fastest 2 hours before soaking,and 4~12 hours later the rate began to slow down.After enclosure and grazing prohibition,from the accumulation and plant cover of the litters on the representative desert steppe,the moisture content of storage and transmission had been the most key ecological process to ecosystem of the desert steppe.更多还原