液态保水剂及土层厚度对坡地树莓生长的影响研究OA

To optimize the site conditions of sloping lands in hilly areas and enhance their productivity and ecological service functions,this study introduced an innovative citric acid-based liquid water-retention agent with non-soil-disturbance characteristics into raspberry planting plots with varying soil layer thicknesses.A two-factor analysis of variance was used to investigate the synergistic effects of the water retention agent and soil layer thickness.The results showed that both the novel liquid water retention agent and soil layer thickness significantly influenced various growth indices of raspberries with the degree of influence ranked as follows:fruit longitudinal diameter＞number of fruit clusters per plant＞stem diameter＞plant height＞relative chlorophyll content(SPAD value)＞maximum number of fruits per cluster.Under their interactive effects,all other indices were significantly influenced except for the maximum number of fruits per cluster,with the order of influence as fruit longitudinal diameter＞stem diameter＞number of fruit clusters per plant＞plant height＞relative chlorophyll content(SPAD value).Soil layer thickness exhibited a threshold effect,where excessively thin layers(＜43 cm)limited water and nutrient supply,while excessively thick layers(＞52 cm)exacerbated nutrient leaching,and the 43～52 cm thickness range enabled efficient water and fertilizer utilization.The combination of the novel water retention agent and appropriate soil layer regulation effectively promoted raspberry growth and enhanced the water conservation function of sloping lands,providing a technically feasible solution for sustainable management of sloping lands in hilly areas that balances eco.