沙埋对沙质盐碱地人工种植碱蓬生长与饲用特性的影响OA

Sand burial is a common ecological process in wind-sandy saline-alkali regions and can substantially alter the habitat conditions of halophytes,thereby affecting their growth and adaptive performance.To evaluate the effects of sand burial on the growth and forage traits of halophytic forage plants,artificially cultivated Suaeda glauca growing in a typical moderately to heavily saline-alkali field in Inner Mongolia was selected as the study species.Four sand burial treatments were established:0 cm(control),5 cm(light burial),10 cm(moderate burial),and 15 cm(severe burial).Growth parameters,including population coverage,density,plant height,and normalized difference vegetation index(NDVI),together with forage traits-related indices,including crude protein(CP),neutral detergent fiber(NDF),and acid detergent fiber(ADF),were determined.Soil physicochemical properties under different burial treatments were also analyzed.The results showed that the effects of sand burial on the growth of S.glauca differed among burial depths.With increasing burial depth,plant height and coverage increased overall.The hight and coverage of plants under severe treatment increased from(4.5±1.5)cm and 28.0％±4.0％to(9.8±2.0)cm and 49.0％±7.0％,respectively,but the population density decreased from(180±10)to(125±10)plants m⁻².NDVI was highest under moderate burial(0.80±0.10),indicating that this treatment was more conducive to the coordinated improvement of plant growth performance.The forage traits of S.glauca also responded markedly to sand burial.Under moderate burial,CP,NDF,and ADF reached(210±18)g/kg,62.0％±3.0％,and 34.0％±2.5％,respectively,suggesting that moderate burial significantly altered forage traits-related traits.In addition,with increasing burial depth,soil EC and Na⁺ de-creased from(1.82±0.14)mS/cm and(5.10±0.28)mg/g to 1.05±0.11 mS/cm and 3.90±0.18 mg/g,respec-tively,whereas SOC,TN,and AP reached relatively high levels under moderate burial,with values of(4.16±0.16)g/kg,(0.36±0.04)g/kg,and(7.50±0.60)mg/kg,respectively.These results indicate that moderate burial had a rela-tively favorable overall effect on alleviating soil salt stress and improving soil nutrient status.Overall,moderate sand buri-al was more effective in improving the soil environment and promoting the growth of S.glauca,while also significantly af-fecting its forage traits.These findings provide a theoretical basis for the regulation of sand burial in the artificial cultiva-tion of S.glauca on sandy saline-alkali land.