通辽火电厂储灰池植被恢复过程中硬拂子茅种群构件的结构特征

doi:10.11686/cyxb2018100

摘要/Abstract

摘要： 植物种群年龄结构对于分析种群的动态和预测群落演替具有重要作用。通过对通辽火电厂储灰池植被恢复过程中硬拂子茅种群分蘖株数量和生物量、根茎长度和生物量的年龄结构以及分蘖株生产力和根茎贮藏力的比较,分析了不同恢复年限和家畜干扰条件下两个恢复区内(第1次取样,1区和2区恢复12和8年;第2次取样,1区和2区恢复16和12年)硬拂子茅种群构件的结构特征。结果表明:恢复年限至12和8年,两个恢复区分蘖株数量和生物量均为增长型年龄结构,根茎长度和生物量分别为增长型和稳定型;恢复至16和12年,两区分蘖株和根茎均为增长型,但龄级构成趋于复杂。两次取样中,两恢复区分蘖株物质生产力随龄级增加不断减少。同一恢复区第2次取样各龄级分蘖株生产力均显著低于第1次;除1龄根茎外,第2次取样各龄级根茎贮藏力均低于第1次。对于尚处于植被恢复演替初期的群落而言,继续围栏禁牧排除家畜啃食等干扰是确保植被恢复进程的可行而有效的方法。

关键词: 生态恢复, 硬拂子茅, 年龄结构, 分蘖株, 根茎

Abstract: The study of age structure of plant population is vital to analyze population dynamics and predict community succession trends. Age structures of tillers, rhizomes, tiller productivity, and rhizome storage capability of Calamagrostis macrolepis var. rigidula populations were studied during vegetation restoration in coal ash storage pools of a Coal fired power plant in the Horqin grassland regions. Age structures of C. macrolepis var. rigidula modules were analyzed under different restoration years (sample 1, spot 1 and spot 2 had been restored for 12 and 8 years respectively; sample 2, spot 1 and spot 2 had been restored for 16 and 12 years respectively) and livestock disturbance recorded. The results indicated that in sample 1, the number and biomass of tillers increased with age as did rhizome length whereas rhizome biomass was stable. The number and biomass of tillers, the length and biomass of rhizomes all increased with age in 12-year and 8-year restoration spots. In two samplings, tiller productivity decreased with increase of age. It reflects the regulation strategy of population priority to young age class with high viability under disturbance. Tiller productivity of each age in the second sampling was significantly lower than first sampling in the same restoration spot. In sample 2, rhizome storage capability was lower than those in sample 2 with the exception 1a rhizomes. The reason for the decline of material productivity in the second sampling in this study is that the management of the ash storage ponds was less than ideal resulting in the restoration areas being grazed by livestock. The decline of material productivity of grassland caused by free grazing was mainly due to the fact that the grazing intensity exceeded the carrying capacity of the restored grassland. For plant communities in the initial stages of restoration, it is very important to prevent disturbance from livestock.

Key words: ecological restoration, Calamagrostis macrolepis var. rigidula, age structure, tiller, rhizome

王柔懿, 盛军, 贾竣棋, 李海燕, 杨允菲. 通辽火电厂储灰池植被恢复过程中硬拂子茅种群构件的结构特征[J]. 草业学报, 2019, 28(1): 180-187.

WANG Rou-yi, SHENG Jun, JIA Jun-qi, LI Hai-yan, YANG Yun-fei. Age structure of Calamagrostis macrolepis var. rigidula populations during vegetation restoration in coal ash storage pools[J]. Acta Prataculturae Sinica, 2019, 28(1): 180-187.

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