不同施氮量对桑园红壤耕层酶活性的影响  

Effects of nitrogen fertilization on enzyme activities in suface layer of red soil under mulberry cultivation

作　　者：曾艳[1] 周柳强[1] 黄美福[1] 黄金生[1] 韦运兰 谢如林[1] 谭宏伟[2] 

机构地区：[1]广西农科院农业资源与环境研究所,南宁530007 [2]广西农科院甘蔗研究所,南宁530007

出　　处：《生态学报》2014年第18期5306-5310,共5页Acta Ecologica Sinica

基　　金：国家自然科学基金(U1033004);广西农科院基金(2011JM12;2013YM19;2014JZ18);农业部科技专项(201003014;201203030)

摘　　要：在广西红壤典型气候区研究施用氮肥对桑园土壤过氧化氢酶、脲酶、酸性磷酸酶和转化酶酶活性的影响,为广西红壤区桑园合理施氮和耕地保育提供科学依据。试验设置3个施氮量水平(N1:120.75 kg N/hm2,N2:172.5 kg N/hm2,N3:207 kg N/hm2),在冬季测定不同氮肥处理下耕层土壤酶活性,并与桑叶产量进行相关分析。结果表明,土壤脲酶和转化酶活性均随着施氮量的增加而增加,过氧化氢酶和酸性磷酸酶活性在中等施氮量(N2处理)下较大。土壤转化酶和脲酶活性呈显著的正相关关系、转化酶和磷酸酶活性呈显著的正相关关系,土壤脲酶、磷酸酶、转化酶活性与桑叶产量呈极显著相关。合理施用氮肥能提高桑园土壤转化酶、磷酸酶、脲酶活性,土壤脲酶和蔗糖酶活性可作为评价桑园土壤肥力质量的指标之一。Studying the effect of nitrogen fertilizer on soil enzymatic activities and Mulberry production is helpful for rational application of N fertilizer and preservation of cultivated lands in Guangxi. Four soil enzymes activities in surface layer of red soil were investigated by using a Mulberry field experiment with different N fertilization treatments in the representative climate zone of Guangxi province. There were three application levels for nitrogen fertilization, including 120.75 kg/hm2 （N1 ）, 172.5 kg/hmZ（ N2） and 207 kg/hm2（ N3 ）. The soil enzymes activities were investigated in winter and their correlation with Mulberry leave yield was analyzed. The results showed that the urease and invertase activities were enhanced with increasing N application rate, while the maximal activities of acid-phosphatase and catalase occured under the moderate N application rate （ N2 ）. Significant positive correlationsship was found between Mulberry leaf yield and activities of invertase, urease, and alkali-phosphatase. The invertase activity was closely correlated to the activities of alkali-phosphatase and urease.

关 键 词：桑园 土壤酶活性 施氮量 红壤区 

分 类 号：S154.2[农业科学—土壤学]