Effects of plateau zokor Eospalax baileyi disturbance on the aboveground-belowground biomass allocation pattern of plant communities and soil physicochemical properties in alpine meadow
To clarify the effects of different disturbance intensities of plateau zokor Eospalax baileyi on the plant biomass allocation pattern and the soil physicochemical properties in alpine meadow,five dis-turbance levels were established,namely no disturbance (control),light disturbance,moderate distur-bance,heavy disturbance,and extremely heavy disturbance. Aboveground biomass,belowground bio-mass,and soil physicochemical properties in each plot were surveyed,and the relationships between the biomass allocation pattern and soil physicochemical properties under different disturbance intensities were analyzed. The results showed that the aboveground biomass of plants initially increased and then decreased with the increase of plateau zokor disturbance. The highest aboveground biomass of plants(400.036 g/m2) was observed under light disturbance,which was significantly higher than the control. The belowground biomass of plants under heavy disturbance (812.885 g/m2) was the lowest and signifi-cantly lower than the control,light and moderate disturbances;plateau zokor disturbance significantly increased soil moisture,decreased soil compaction and organic carbon. The contents of soil total nitro-gen,available phosphorus,nitrate nitrogen,and ammonium nitrogen first increased and then decreased with increasing disturbance intensity;under light,moderate,and heavy disturbance,plant biomass was preferentially allocated to aboveground parts,with the highest trade-off index observed under light and heavy disturbance (0.027). Under extreme disturbance,the plant biomass allocation shifted towards the below-ground parts,with a trade-off index of 0.029;correlation analysis showed that the trade-off index for plant biomass negatively correlated with soil nutrient content,positively correlated with soil mois-ture and pH,but only significantly negatively correlated with available phosphorus content in the soil.
万方数据
维普
