Effects of Agricultural Activities on Niche of Main Wetland Plant Populations in Sanjiang Plain

doi:10.7525/j.issn.1673-5102.2017.03.018

Abstract

Abstract: Agricultural activities is one of the main disturbance styles in Sanjiang Plain, and the long-term agricultural activities had made a significant influence on the wetland environment. The 20 dominant species in Sanjiang Plain were selected to study its characteristics of niche breadth and niche overlap in 8 resources dimensions, including soil moisture, total nitrogen, available nitrogen, total phosphorus, available phosphorus, total potassium, available potassium, and soil organic carbon, and reveal the impact of agricultural activities on the niche of dominant plant populations. Deyeuxia angustifolia has the greatest niche breadth, and Carex lasiocarpa has the smallest niche breadth among the dominant species. Among the companion species, Lysimachia thyrsiflora has the greatest niche breadth. The 20 dominant species showed the difference in utilization of different resources dimensions. More than 60% species showed a narrow niche breadth in SOC, and more than 60% species showed a wide niche breadth in soil moisture, nitrogen, phosphorus and potassium. The dominant species showed the different niche breadth and niche overlap in soil moisture, SOC and N, and this differences are the main factors affecting the species distribution and population differentiation. The change of soil environment caused by agricultural activities would lead to the competition for limited resources among plant populations, and it would be also the key factors influencing the species composition and community dynamics.

Key words: agricultural activities, populations, niche breadth, niche overlap, wetland

CLC Number:

Q145+.1

HAN Ming-Hao, LIU Ying-Nan, ZHOU Dan, SUI Xin, NI Hong-Wei, MU Li-Qiang. Effects of Agricultural Activities on Niche of Main Wetland Plant Populations in Sanjiang Plain[J]. Bulletin of Botanical Research, 2017, 37(3): 461-467.

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