论文部分内容阅读
在Studsgaard和Ronhave试验地进行了18年麦秸与残茬翻混、麦秸与残茬焚烧处理。Studsgaard试验地土壤为壤质砂土,Ronhave土壤为砂壤土。1984年4月初取土样,经风干、过筛,用螺旋式超声和重力沉降法将各处理土壤粒级分为砂粒、粉粒和粘粒,分离后在40℃下干燥5天,将砂粒、粉粒和粘粒按土壤类型和处理分别混合为一个样本,对样本用6NHCl水解并测定各种氨基酸含量(不包括含硫氨基酸,但包括二氨基庚二酸)。氨基酸是用LKB Alpha Plus分析器和茚三酮法测定的,全N是用Tecator全N分析器开氏法测得。测得数据表明:麦秸翻混处理不影响土壤颗粒大小的分布,但比麦秸焚烧处理增加全N量4～14％。麦秸的不同处理不
Studsgaard and Ronhave experimented with 18 years of straw and stubble turning, wheat straw and stubble incineration. Studsgaard soil test for the loamy soil, Ronhave soil as sandy loam. At the beginning of April 1984, soil samples were taken, air-dried and sieved. The grain size of each treatment was divided into grit, silt and clay with spiral sonication and gravity sedimentation. After separation, the sand was dried at 40 ℃ for 5 days. , And silt and clay were mixed into one sample by soil type and treatment, respectively, and samples were hydrolyzed with 6N HCl and various amino acid contents (excluding sulfur-containing amino acids, but including diaminopimelic acid) were determined. Amino acids were determined using the LKB Alpha Plus analyzer and the ninhydrin method, and the total N was measured using the Tecator All-N analyzer Kaiser’s method. Measured data show that: wheat straw mixing treatment does not affect the distribution of soil particle size, but than wheat straw burning treatment to increase the total N 4-14%. Different treatment of straw not