放牧强度对克氏针茅草原的土壤酶活性和养分影响  

Effects of Grazing Intensities on Soil Enzyme Activities and Nutrient in Stipa Krylovii Steppe

作　　者：张凤杰[1] 乌云娜[1] 宋彦涛[1] 霍光伟[1] 

机构地区：[1]大连民族学院环境与资源学院,辽宁大连116605

出　　处：《大连民族学院学报》2015年第1期6-9,共4页Journal of Dalian Nationalities University

基　　金：国家自然科学基金项目(31170402;31470504);中央高校基本科研业务费专项资金资助项目(DC2010114);大连民族学院人才启动基金资助项目(110050);大连民族学院创新团队资助项目(0220-118081)

摘　　要：以内蒙古呼伦贝尔的克氏针茅(Stipa krylovii)典型草原作为研究对象,研究轻、中、重三种放牧强度对草地土壤养分和土壤酶活性的影响和相互作用,旨在为克氏针茅草原生态系统的保护、恢复及重建提供科学依据。结果表明:土壤养分含量显著降低(P<0.01);随着放牧强度的增加,过氧化氢酶和蔗糖酶均显著降低(P<0.05),而对脱氢酶和磷酸酶无显著差异(P>0.05)。相关分析表明,土壤酶活性与土壤养分含量密切相关,放牧干扰条件下土壤中有效磷与土壤脲酶、过氧化氢酶、蔗糖酶和磷酸酶粒脲酶活性呈显著相关(P<0.05)。Taking Stipa krylovii typical steppe in Hulunbuir of Inner Mongolia as test objects, the effects of different grazing intensities on soil enzyme activities and chemical properties were stud-ied, aiming to provide scientific basis for protection, restoration and reconstruction of Stipa kry-lovii. The results showed the soil nutrients reduced significantly （P〈0. 01） along with the in-creasing of grazing intensity. The activities of soil catalase and sucrase enzymes all reduced sig-nificantly （P〈0. 05）with the increasing of grazing intensity, but there was no significant differ-ence between soil phosphatase and dehydrogenase enzyme activities （ P〉0 . 05 ） . The results of correlation analysis showed that soil enzyme activities was closely related to soil nutrient con-tents, and soil available phosphorus content and soil urease, catalase, sucrase and phosphatase activities in grazing disturbance conditions were significantly correlated （ P 〈0 . 05 ） .

关 键 词：克氏针茅草原 放牧强度 土壤酶活性 养分 

分 类 号：S154.3[农业科学—土壤学]