中国草地学报2025，Vol.47Issue(10)：96-110,15.DOI:10.16742/j.zgcdxb.20250145
氮磷肥配施对西藏轻度退化高寒草甸生产力及土壤特性的影响
Effects of Combined Nitrogen and Phosphorus Fertilization on Productivity and Soil Characteristics of Degraded Alpine Meadow in Xizang
摘要
Abstract
Fertilization is a key strategy for restoring degraded grasslands.To identify suitable nitrogen(N)and phosphorus(P)fertilization gradients for enhancing the productivity and soil characteristics of degraded alpine meadows,a lightly degraded alpine meadow in Dangxiong County,Xizang Autonomous Region,was selected for study.A two-factor randomized block design was employed,with four nitrogen levels(N0:0 kg N/hm2,N1:60 kg N/hm2,N2:90 kg N/hm2,N3:120 kg N/hm2)and four phosphorus lev-els(P0:0 kg P2O5/hm2,P1:30 kg P2O5/hm2,P2:60 kg P2O5/hm2,P3:90 kg P2O5/hm2),resulting in 16 N-P treatments combinations,with N0P0 treatment serving as the control(CK).Grassland productivity and soil characteristics were evaluated to determine the optimal N-P combinations.The results showed that the combined application of nitrogen and phosphorus fertilizers significantly enhanced aboveground biomass compared with the control,with the N2P2 and N2P3 treatments increasing biomass by 136.9%and 111.9%,respectively(P<0.05).The combined application also improved soil organic carbon content,particularly in the 0-10 cm soil layer,where the N2P1 and N2P3 treatments reached 15.67 g/kg and 15.26 g/kg,respec-tively.Available phosphorus content was highest under N2P3 treatment in both 0-10 cm and 10-20 cm soil lay-ers,while total nitrogen content was greatest under N3P1 treatment.Grey correlation analysis of aboveg-round biomass and soil characteristics(0-10 cm)indicated that N2P3 treatment provided the most favor-able comprehensive improvement in productivity and soil nutrient status,followed by N3P3 treatment.Therefore,the combination of 90-120 kg/hm2 nitrogen fertilizer with 90 kg/hm2 phosphorus fertilizer is rec-ommended as the optimal strategy for the restoration of degraded alpine meadows in Dangxiong County,Xizang Autonomous Region.关键词
高寒草甸/氮磷肥配施/土壤理化性质/地上生产力Key words
Alpine meadow/Combined nitrogen and phosphorus fertilization/Soil physicochemical properties/Aboveground productivity分类
农业科技引用本文复制引用
史金涛,鱼小军,杨安,张小娟,张龙骥,盛宇航,颉进博..氮磷肥配施对西藏轻度退化高寒草甸生产力及土壤特性的影响[J].中国草地学报,2025,47(10):96-110,15.基金项目
退化草原生态修复治理试验示范项目(GZFCG2023-17620) （GZFCG2023-17620）
