不同退化程度高寒草甸土壤磷素含量与碱性磷酸酶活性研究  

The phosphorus content and alkaline phosphatase activity of different degraded alpine meadow

作　　者：高亚君 李亚娟[1] 姜智英 达朝玲 胡蕊梅 GAO Ya-jun;LI Ya-juan;JIANG Zhi-ying;DA Zhao-ling;HU Rui-mei(College of Pratacultural Science,Gansu Agricultural University,Key Laboratory for Grassland Ecosystem of Edu-cation Ministry,Pratacultural Engineering Laboratory of Gansu Province/Sino-U.S.Centers for Grazingland Eco-system Sustainability,Lanzhou 730070,China)

机构地区：[1]甘肃农业大学草业学院,草业生态系统教育部重点实验室,甘肃省草业工程实验室,中-美草地畜牧业可持续发展研究中心,甘肃兰州730070

出　　处：《草原与草坪》2022年第5期81-87,共7页Grassland and Turf

基　　金：甘肃省自然科学基金(20JR5RA036);甘肃省草原生态修复治理科技支撑项目。

摘　　要：为探讨高寒草甸退化对土壤磷素、碱性磷酸酶活性及其季节动态的影响,分别在春季、夏季和冬季以典型围封草地(FG)、轻度(LD)、中度(MD)和重度退化草甸(HD)为研究对象,对不同季节不同类型草地0~10,10~20,20~30 cm土层全磷、有效磷和碱性磷酸酶活性进行了研究。结果表明,春季高寒草地退化对土壤磷素含量没有明显影响;相比FG,夏季退化高寒草地0~10 cm土层全磷含量显著升高(P<0.05),但LD、MD和HD间差异不显著;退化导致10~20 cm土层全磷含量显著降低(P<0.05)。同一类型草地同一土层全磷含量冬季最高,夏季最低,与夏季相比,冬季0~10 cm土层土壤全磷含量从FG到HD依次增加了308.33%、150.00%、176.20%、177.30%。FG春季0~10 cm土层有效磷含量为30 mg/kg,随退化程度加剧,从LD到HD含量依次升高。FG和HD季节与土层交互效应有效磷含量差异极显著,而LD和MD不显著。LD和MD的土壤有效磷含量夏季最高,冬季最低,HD则春季最高,冬季最低。春季同一退化程度高寒草地0~10 cm土层碱性磷酸酶活性最低,剖面10~30cm土层土壤碱性磷酸酶活性在春夏两季显著升高(P<0.05)。相关性分析结果表明,仅在冬季土壤碱性磷酸酶活性与有效磷含量呈显著正相关,表明冬季土壤碱性磷酸酶活性可以表征土壤有效磷状况。Fenced grassland(FG),lightly(LD),moderate(MD)and heavily degraded alpine meadow(HD)were selected as the sample site,and the soil total phosphorus,available phosphorus and alkaline phosphatase activity of different grasslands types in the 0~10,10~20,and 20~30cm soil depth in spring,summer and winter were studied to investigate the effects of alpine meadow degradation on soil phosphorus characteristics and their seasonal dynamics.The results showed that the degradation of alpine meadow had no significant effect on the soil phosphorus content in spring.Soil total phosphorus content in 0~10 cm of degraded alpine meadows in summer increased significantly(P<0.05),but there was no significant differences among three degraded types,but that in 10~20 cm soil depth was significantly decreased in degraded alpine meadows(P<0.05)compared with FG.Soil total phosphorus content of the same type of grassland in the same soil depth showed the highest in winter and the lowest in summer,and that in 0~10 cm soil depth in winter increased by 308.33%,150%,176.2%,and 177.3%from FG to HD respectively compared with summer.Soil available phosphorus content in 0~10cm in FG was 30 mg/kg in spring,and it increased gradually from LD to HD.The interactive effect of soil available phosphorus content between seasons and soil depths was extremely significant in FG and HD,but not significant in LD and MD.LD and MD had the highest in summer and the lowest in winter,while HD had the highest available phosphorus content in spring and the lowest in winter,which indicated that degradation had changed the seasonal variation of soil available phosphorus.Soil alkaline phosphatase activity in the same soil depth increased significantly with the degradation degree.Soil alkaline phosphatase activity in 0~10cm soil depth of the same degraded alpine meadow was the lowest in spring,while that of the 10~30cm soil depth in the profile increased significantly both in spring and summer(P<0.05).Correlation analysis revealed that soil alkaline phosphatase activity had

关 键 词：高寒草甸 退化 土壤全磷 土壤有效磷 碱性磷酸酶 

分 类 号：S812[农业科学—草业科学]