The distribution features of two widespread legumes and their relationships with soil factors in Songnen grassland

doi:10.11686/cyxb20140105

Abstract

Abstract: Through field investigations,distribution features of aboveground biomass of Lathyrus quinqueneruius and Viciaam cracca,and their relationships with soil factors were studied in Songnen grassland. The maximum aboveground biomass of L. quinqueneruius was 286.25 g/m²,and the minimum was 51.73 g/m²,while the values for V.cracca were 494.77 and 61.19 g/m² respectively. Population aggregation levels of the two legumes were primarily 100-200 g/m² and 100-300 g/m² respectively. There were significant positive correlations between aboveground biomass of the two legumes with community height,community aboveground biomass,species richness index,diversity index,evenness index,and significant negative correlation relationships with community density. There were significant positive correlation relationships between aboveground biomass of the two legumes with soil organic carbon content,total nitrogen content,and significant negative correlation relationships with soil pH and electrical conductivity,but no significant correlation relationship with soil total phosphorus content. Under low legume aboveground biomass,the change of community characteristics and soil factors with an increase of legume biomass was large but it became weaker with an increase of legume biomass. Compared with V.cracca,the change rates of community characteristics and soil factors with an increase of L. quinqueneruius aboveground biomass were larger (51.73 and 61.19 g/m² respectively) and were the minimum aboveground biomass in unit area to maintain population existence for L. quinqueneruius and V.cracca,respectively. The ecological traits of the two legumes may have facilitation effects on community structure and function,and the effects from unit mass of L. quinqueneruius rather than V.cracca may be greater. Degree of soil salinization alone did not limit the distribution of the two legumes. Soil phosphorus may be a limited factor for distribution of these two legumes. This study provides important references for protection and development of these two legumes in this region.

CLC Number:

S812.2

LI Qiang,ZHOU Dao-wei,SONG Yan-tao. The distribution features of two widespread legumes and their relationships with soil factors in Songnen grassland[J]. Acta Prataculturae Sinica, 2014, 23(1): 31-40.

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