科尔沁草原区火电厂储灰池植被恢复过程中白草种群分蘖株的年龄结构  

Age structure of Pennisetum flaccidum populations during vegetation restoration in coal ash storage pools of Coal Power Plant in the Kerqin grassland region

作　　者：李海燕[1] 杨允菲[1] 

机构地区：[1]东北师范大学草地科学研究所,植被生态科学教育部重点实验室,长春130024

出　　处：《生态学报》2014年第20期5907-5914,共8页Acta Ecologica Sinica

基　　金：高等学校博士学科点专项科研基金项目(20110043110005);国家自然科学基金项目(31170504;30901049);吉林省科技厅青年基金项目(20110112)

摘　　要：植被恢复过程中优势植物种群的年龄结构对于演替动态的预测具有重要的作用。通过对科尔沁草原区火电厂不同恢复年限储灰池植被恢复过程中白草种群分蘖株年龄结构、分蘖节芽年龄结构、分蘖株的物质生产力及营养繁殖力的比较研究,分析了不同恢复年限(1区:1992—1993年恢复;2区:1996—1997年恢复:3区:1999—2000年恢复)和家畜干扰条件下(2005年开始)白草分蘖株结构的变化。结果表明:2003年围栏时,随着恢复年限的增长,3个储灰池中白草分蘖株数量和生物量的龄级构成以增长型为主;2007年时,两年不同程度的家畜干扰后,3个储灰池中白草分蘖株数量和生物量均为稳定型结构。2007年各龄级白草分蘖节芽及其总量均显著高于2003年。2003年围栏时,3个储灰池中白草分蘖株的物质生产力在同一龄级间均无显著差异;2007年家畜干扰后,2区和3区中1a分蘖株和总体均值的物质生产力均显著低于2003年。2003年围栏时,3区中1a分蘖株和总体均值的营养繁殖力均显著高于1区和2区;2007年家畜干扰后,3区中1a、3a分蘖株和总体均值的营养繁殖力均显著低于1区和2区;2007年各龄级分蘖株及总体均值的营养繁殖力均高于2003年,各恢复区1a、1区2a和各区分蘖株营养繁殖力的均值在两个取样年间的差异均达到显著水平。继续围栏保护对于本研究中火电厂储灰池的植被恢复是切实可行而有效的管理措施。Age structure of dominant plant populations is vital to forecast community dynamics during vegetation restoration.Pennisetum flaccidum,a perennial grass with long rhizomes,is widely distributed in the northeast and western regions as well as the Inner Mongolian Plateau of China. In the Kerqin grassland region,P. flaccidum is one of several native plant species that are used to restore coal ash storage pools generated by Coal Power Plants. In 2003,we located three ash storage pools（ from here on referred to as ‘plots＇） that differed in age（ 12,8,and 5 years old） and contained P. flaccidum. We found that natural colonization had successfully restored these plots,with the average herbaceous cover for all three plots reaching 85% —90%. We sampled the P. flaccidum population. Due to relaxed oversight at the storage pools following a change in the managing entity in 2005,the plots were grazed by livestock. In 2007,we resampled the same plots and found that the total vegetation coverage had decreased to 30% —50%.In late August of 2003 and 2007,three to five replicate quadrats（ each 0.25 x 0.25 m in area and 50 cm deep） in each plot were sampled by taking soil cores,including all aboveground shoots and belowground rhizomes,to maintain the inherent links among tillers and rhizomes. Age classes of tillers and tillering buds were classified according to vegetative propagation generations of tillering nodes and their numbers were counted. Age structure of tillers,tiller buds,tiller matter productivity and tiller vegetative propagation capability of P. flaccidum populations were studied during different vegetation restoration years in the coal ash storage plots of Coal Power Plant in the Kerqin grassland region. Structure changes of P.flaccidum tillers were analyzed under different restoration years（ spot 1： 1992—1993; spot 2： 1996—1997; spot 3：1999—2000） and livestock disturbance（ the beginning of 2005）. Number and biomass of P. flaccidum tillers showed expanding age structures in both

关 键 词：生态恢复 白草 无性系植物 分蘖株 年龄结构 

分 类 号：Q948[生物学—植物学]