Estimation of the Effects of Maize Straw Return on Soil Carbon and Nutrients Using Response Surface Methodology  

作　　者：ZHOU Dongxing SU Ye NING Yucui RONG Guohua WANG Guangdong LIU Di LIU Liyan 

机构地区：[1]College of Resources and Environmental Science, Northeast Agricultural University [2]Publicity and United Front Work Department, Northeast Agricultural University

出　　处：《Pedosphere》2018年第3期411-421,共11页土壤圈（英文版）

基　　金：supported by the Special Fund for Agro-scientific Research in the Public Interest of China (No. 201503116-04);the Science and Technology Achievements Transformation Fund Project of China (No. 2013GB2B200134)

摘　　要：Straw incorporation is generally considered an effective agricultural management practice that improves nutrient cycling and maintains soil fertility. To study the interactive effects of straw returning factors on soil organic carbon and available nutrients, a17-month(May 6, 2016 to October 6, 2017) experiment was conducted on straw incorporation by using response surface methodology under a three-factor(straw length, amount, and burying depth), five-level quadratic orthogonal rotation experimental design. Weight was assigned to each indicator for soil carbon and nutrients and then a comprehensive indicator was established. Then, a second-order polynomial model of the three straw returning factors was established using response surface methodology. Results indicated that17 months after straw incorporation, straw amount and burying depth had significant effects on the comprehensive indicator of soil carbon and nutrients. Straw length and the interactions of straw amount and burying depth showed no significant effects on the comprehensive indicator of soil carbon and nutrients. It was concluded that 17 months after straw incorporation, the highest value of the comprehensive indicator of soil carbon and nutrients was achieved when the straw length, amount, and burying depth were approximately 17–20 cm, 740–840 g m^(-2), and 9–13 cm, respectively, which can be recommended as the most suitable parameters for use in straw returning in the study area.Straw incorporation is generally considered an effective agricultural management practice that improves nutrient cycling and maintains soil fertility. To study the interactive effects of straw returning factors on soil organic carbon and available nutrients, a 17-month （May 6, 2016 to October 6, 2017） experiment was conducted on straw incorporation by using response surface methodology under a three-factor （straw length, amount, and burying depth）, five-level quadratic orthogonal rotation experimental design. Weight was assigned to each indicator for soil carbon and nutrients and then a comprehensive indicator was established. Then, a second-order polynomial model of the three straw returning factors was established using response surface methodology. Results indicated that 17 months after straw incorporation, straw amount and burying depth had significant effects on the comprehensive indicator of soil carbon and nutrients. Straw length and the interactions of straw amount and burying depth showed no significant effects on the comprehensive indicator of soil carbon and nutrients. It was concluded that 17 months after straw incorporation, the highest value of the comprehensive indicator of soil carbon and nutrients was achieved when the straw length, amount, and burying depth were approximately 17-20 cm, 740-840 g m^-2, and 9-13 cm, respectively, which can be recommended as the most suitable parameters for use in straw returning in the study area.

关 键 词：agricultural management practice soil fertility soil organic carbon straw amount straw burying depth straw length straw returning factors 

分 类 号：S141.4[农业科学—肥料学] S158[农业科学—农业基础科学]