施肥对印楝幼林土壤酶活性的影响及其调控土壤肥力的作用  

Effects of Fertilization on Soil Enzyme Activities and Its Role in Adjusting-Controlling Soil Fertility of Young Azadirachta indica A.Juss.Plantations

作　　者：张昌顺[1] 李昆[1] 马姜明[1] 郑志新[1] 

机构地区：[1]中国林业科学研究院资源昆虫研究所国家林业局云南元谋荒漠生态系统定位研究站

出　　处：《林业科学研究》2006年第6期750-755,共6页Forest Research

基　　金：国家"十五"攻关项目"雨养人工植被群落恢复技术与示范研究"(2001BA606A-07);国家科技部公益性研究项目(2000BIB50164)资助

摘　　要：为探讨施肥条件下土壤酶活性及其与土壤肥力的关系,对国家林业局云南元谋荒漠生态系统定位研究站3年生印楝林的土壤酶、土壤化学性质和微生物因子进行了测定和分析。结果表明:(1)N、P、K与有机肥混施(处理9:N200P120K80M3000)对增强3年生印楝林土壤酶活性效果最佳;处理6(P240)对改善林地化学性质和提高林地微生物数量效果最好;处理8(N200P120K80)对改善土壤酸碱性最佳。(2)土壤酶活性与土壤肥力之间具有很好的相关性,其中酸性磷酸酶活性与水解氮、交换性钙和交换性镁含量呈显著正相关,与有效铁含量呈显著负相关;蔗糖酶与有机质呈显著正相关,与水解氮呈极显著正相关;脲酶与pH值和细菌含量呈显著负相关;过氧化氢酶与有效磷呈极显著正相关,蛋白酶和多酚氧化酶与土壤肥力各指标间无显著相关。此外,除蛋白酶外,其余酶与其他一些肥力指标的相关系数在0.5以上,说明土壤酶活性可作为该地区印楝林土壤肥力评价的重要指标。To search the correlation between soil enzyme activities and soil fertility under fertilization conditions, the indexes of soil enzyme, soil chemical property and soil microbes in 3-years Azadirachta indica plantation were detected and analyzed in Yunnan Yuanmou Desert Ecosystem Located Research Station of State Forestry Administration. The results were as follows：（ 1 ） The application of N ,P,K fertilizers combined with organic manure （treatment 9） was the best way to strengthen young plantation soil enzyme activities, while, for increase soil chemical properties and soil microbes quantities, treatment 6 was the best one, and the effect of treatment 8 to improve soil pH was the best one. （2） The correlation between soil enzyme activities and soil fertility indexes was significant. The activities of sucrase and catalase were respectively significantly correlated with hydrolytic nitrogen and available phosphorus at the 0.01 level. The positive correlation of acid phosphatase activity with the contents of hydrolytic nitrogen, exchangeable calcium and exchangeable magnesium, and sucrase activity with the content of organic matter, were significant, the negative correlation of urease activity with soil pH and bacteria amount, and acid phosphatase activity with the content of available iron were also found prominently. While the correlation between the protease and poly- phenol oxidase and soil fertility indexes was not obvious. In addition, except protease, activities of many correlation coefficients of soil enzyme activity and others soil fertility indexes were more than 0.5, and indicated that the soil enzyme activities could be use to evaluate the soil fertility of Azadirachta indica plantations in this area.

关 键 词：干热河谷 印楝 土壤酶活性 土壤肥力 

分 类 号：S714.8[农业科学—林学]