摘要
为探究不同种植模式下坡耕地红壤团聚体中的酶活性和养分含量,为改善耕地质量提供理论依据,以坡耕地红壤为研究对象,设置大豆单作(DD)、玉米单作(MM)、大豆玉米间作(MD)、裸地(CK)4个处理,利用干筛法获得2~1、1~0.25、<0.25 mm粒径团聚体,并测定了其中的酶活性和养分含量。结果表明:①与CK、DD、MM处理相比,MD处理显著提高了2~1 mm粒径团聚体的含量,增幅分别为22.2%、13.3%、16.2%。②MD处理显著提高了2~1 mm粒径团聚体中的有机质、有效磷、碱解氮含量,分别较DD和CK处理提高11.9%、29.2%,51.1%、57.5%和16.5%、29.1%;速效钾含量均表现为DD处理显著高于CK、MM、MD处理。③与CK、DD、MM处理相比,MD处理显著提高了2~1 mm和1~0.25 mm粒径团聚体中的脲酶活性,增幅分别为61.0%、18.8%、14.5%和65.0%、17.9%、13.8%,显著提高2~1 mm粒径团聚体中的蔗糖酶活性和<0.25 mm粒径团聚体中的酸性磷酸酶活性,增幅分别为63.8%、57.1%、32.8%和80.4%、44.3%、74.1%。④冗余分析表明,2~1 mm粒径团聚体中的脲酶和蔗糖酶活性与有效磷、有机质含量显著正相关,1~0.25 mm粒径团聚体中的酶活性与有机质、有效磷、碱解氮含量显著正相关,<0.25 mm粒径团聚体中的酶活性与碱解氮、有效磷含量显著正相关。研究表明,合理的种植模式不仅可以促进大团聚体的形成,还能提高大团聚体中的酶活性和养分含量,从而提高土壤肥力,改善耕地质量。
The aim of this study is to explore enzyme activities and nutrient contents in red soil aggregates under different planting patterns,and to provide the theoretical basis for improving the quality of cultivated land.Four treatments,soybean monoculture(DD),corn monoculture(MM),soybean maize intercropping(MD)and bare soil(CK),were used to obtain aggregates with 2–1,1–0.25 and<0.25 mm sizes by dry screening method,and enzyme activities and nutrient contents in aggregates were measured.The results showed as follows:1)Compared with CK,DD and MM,MD significantly increased the contents of 1–2 mm aggregates by 22.2%,13.3%and 16.2%,respectively.2)MD significantly increased the contents of organic matter,available phosphorus and alklyzable nitrogen in 2–1 mm aggregates.Compared with DD and CK,MD significantly increased the contents of organic matter,available phosphorus and alklyzable nitrogen in 2–1 mm aggregates by 11.9%,29.2%,51.1%,57.5%and 16.5%,29.1%,respectively.The content of available potassium in DD was significantly higher than those in CK,MM and MD.3)Compared with CK,DD and MM,MD significantly increased urease activity in 2–1 mm and 1–0.25 mm aggregates by 61.0%,18.8%,14.5%and 65.0%,17.9%,13.8%,respectively.The activities of sucrase in 2–1mm aggregates and acid phosphatase in<0.25 mm aggregates were significantly increased by 63.8%,57.1%,32.8%and 80.4%,44.3%,74.1%,respectively.4)RDA showed that the activities of urease and sucrase in 2–1mm aggregates were significantly positively correlated with the contents of available phosphorus and organic matter.In addition,enzyme activities in 1–0.25 mm aggregates were significantly positively correlated with the contents of organic matter,available phosphorus and alkali-hydrolyzed nitrogen,while those in<0.25 mm aggregates were significantly positively correlated with the contents of alkali-hydrolyzed nitrogen and available phosphorus.The results prove that reasonable planting patterns can not only promote the formation of large soil aggregates,but also increase their enzyme activities and nutrient contents,thus,can improve soil fertility and cultivated land quality.
作者
杨继芬
李永梅
李春培
王璐
芦美
范茂攀
赵吉霞
YANG Jifen;LI Yongmei;LI Chunpei;WANG Lu;LU Mei;FAN Maopan;ZHAO Jixia(College of Resources and Environment,Yunnan Agricultural University,Kunming 650201,China)
出处
《土壤》
CAS
CSCD
北大核心
2023年第4期787-794,共8页
Soils
基金
云南省科技重大专项子课题(2019ZG00902-08)
国家自然科学基金青年基金项目(42007002)
国家自然科学基金地区科学基金项目(41661063)资助。
关键词
种植模式
坡耕地
团聚体
酶活性
Planting patterns
Sloping farmland
Aggregate
Enzyme activity
