摘要
以宁夏当地易得的杨树枝条为材料,通过模拟试验设计了未粉碎枝条表施(UBM)、粉碎枝条表施(GBM)、粉碎枝条混施(GBI)、粉碎枝条混施+未粉碎枝条表施(GBI+UBM)、对照(CK)5种处理方式,研究了杨树枝条不同施用方式对宁夏沙化土壤中碳、氮、磷、钾含量及土壤密度、田间持水率、孔隙度、含水量、微生物数量和土壤酶活性的影响。结果表明:与CK相比,GBI和GBI+UBM显著提高了土壤总孔隙度、田间持水量以及速效钾、无机氮、细菌、放线菌、真菌、微生物量碳、氮的含量;显著提高了脲酶、纤维素酶的活性,显著降低了土壤密度(p<0.05)。GBI+UBM整体上对沙化土壤改良效果较GBI显著(p<0.05)。UBM和GBM只对土壤含水量、放线菌含量影响显著(p<0.05),且两处理间无显著差异(土壤含水量除外)。主成分分析结果表明各处理对沙化土壤的改良效果依次为GBI+UBM>GBI>UBM>GBM>CK。该研究为宁夏当地及中国北方干旱半干旱地区沙化土地改良提供可借鉴的案例。
Local poplar branch was selected as amended materials,and simulated experiment with five amended patterns including mulching unground branch(UBM),mulching ground branch(GBM),incorporating ground branch(GBI),incorporating ground branch plus mulching unground branch(GBI+UBM),and control(CK)were designed for testing changes of C,N,P,K,bulk density,field water holding capacity,porosity,soil moisture content,microbial number and enzyme activities of desertification soil in Ningxia.The results showed that compared with CK,GBI and GBI+UBM significantly decreased bulk density,but increased soil total porosity,field water holding capacity,P,inorganic N,K,bacteria number,actinomyces number,fungi number,microbial biomass C and microbial biomass N,urease activity and cellulose activity(p<0.05),and GBI+UBM was more effective than GBI(p<0.05).However,UBM and GBM merely increased soil moisture content,actinomyces number and there no different between them(except soil moisture content).PCA showed the amended effects among treatments followed the order:GBI+UBM>GBI>UBM>GBM>CK.This study provides a successful case for sandy soil improvement in Ningxia and other arid and semiarid areas of North China.
作者
庞飞
李志刚
李健
李金林
PANG Fei;LI Zhigang;LI Jian;LI Jinlin(School of Life Sciences,Ningxia University,Yinchuan 750021,China;Agricultural school,Ningxia University,Yinchuan 750021,China;State Key Laboratory of the Seedling Bioengineering,Ningxia Forestry Institute,Yinchuan 750004,China)
出处
《水土保持研究》
CSCD
北大核心
2018年第2期99-104,共6页
Research of Soil and Water Conservation
基金
国家国际合作专项(2015DFA90900)
引进国际先进林业科学技术项目(2013-04-79)
关键词
沙化土壤
杨树枝条
改良效果
宁夏
desertified soils
poplar branch
amended effects
Ningxia Hui Autonomus Regin
