秸秆生物质炭对镉污染水稻土根际酶活性的影响  

Effects of straw biochar on rhizospheric enzyme activities in Cd contaminated paddy soil

作　　者：尚艺婕 张秀[1] 王海波[1] 史静[1] 

机构地区：[1]云南农业大学资源与环境学院,昆明650201

出　　处：《农业环境科学学报》2016年第8期1532-1540,共9页Journal of Agro-Environment Science

基　　金：云南省应用基础研究计划项目(2013FB043);国家自然科学基金项目(41301349)

摘　　要：为了探究不同Cd污染程度下生物质炭输入对水稻根际土氧化还原类酶、碳循环酶的活性变化的影响,选取水稻作为研究对象,测定不同生物质炭量及Cd施入下水稻根际及非根际土壤酶活性的变化状况。研究表明,不同处理下,水稻根际土壤碳循环酶的综合活性指数值介于1.388~12.029之间,而非根际土壤碳循环酶的活性指数值介于0.542~1.713之间。水稻根际土壤氧化还原类酶的综合活性指数值介于0.387~1.627之间,而非根际土壤氧化还原酶指数值介于0.167~1.201之间。可见水稻根际碳循环类酶及氧化还原类酶的活性均高于非根际土壤。当生物质炭施入量为10%,Cd的含量为2.5 mg·kg^(-1)时,水稻根际土壤的碳循环类酶活性指数为12.029,氧化还原类酶活性指数为1.192,均达到最大。由此可得,该浓度的生物质炭施入对两大类酶活性值的提升均有显著作用。Biochar may reduce heavy metal bioavailability in soils through enhancing adsorption and thus modifies enzymatic activities in polluted soils. Here an experiment was conducted to explore the effects of biochar additions on activities of redox enzymes and carbon cycle enzymes in the rhizosphere of rice under different cadmium（Cd）pollution. Results showed that under different treatments the comprehen-sive value of carbon cycle enzyme activities varied between 1.388 and 12.029 in the rhizospheric soil, while from 0.542 to 1.713 in non-rhi-zospheric soil. The composite value of redox enzyme activities in the rhizospheric soil of rice was in the range of 0.387 to 1.627, but from 0.167 to 1.201 in the non-rhizospheric soil of rice. The activities of both redox enzyme and carbon cycle enzyme in the rhizospheric soil of rice were higher than those in non-rhizospheric soil. At 10%of biochar addition and 2.5 mg·kg-1 of Cd content, the activities of carbon cy-cle enzyme and redox enzyme in the rhizospheric soil were 12.029, and 1.192, respectively, which were the highest. Therefore, this rate of biochar has a remarkable enhancing effect on activities of these two enzymes.

关 键 词：生物质炭 水稻 根际土 土壤碳循环酶 土壤氧化还原酶 

分 类 号：S154.2[农业科学—土壤学]