Age structure of Calamagrostis macrolepis var. rigidula populations during vegetation restoration in coal ash storage pools

doi:10.11686/cyxb2018100

Abstract

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

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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