沈阳市耕地表土层厚度与耕地产能关系研究  

Relationship between Topsoil Thickness and Productivity of Cultivated Land in Shenyang

作　　者：董秀茹[1] 刘小庆 孙福军[1] DONG Xiu-ru;LIU Xiao-qing;SUN Fu-jun(College of Land and Environment,Shenyang Agricultural University,Shenyang 110866,China;Beijing Dalong Holdings Co.,Ltd.Beijing 101300,China)

机构地区：[1]沈阳农业大学土地与环境学院,辽宁沈阳110161 [2]北京市大龙控股有限公司,北京顺义101300

出　　处：《土壤通报》2019年第4期800-806,共7页Chinese Journal of Soil Science

基　　金：国家土地督察沈阳局课题(201612007)资助

摘　　要：表土对于作物生长至关重要.表土层厚度影响着耕地产能的大小,然而二者之间的关系尚缺乏具体的研究,明晰耕地表土层厚度与耕地产能之间的关系,对于提升耕地产能促进耕地质量提升具有重要意义。当前大量耕地被建设占用,表土遭到破坏,研究表土厚度与耕地产能间的函数关系,促进表土资源的保护与利用是十分必要与紧迫的。本研究以沈阳市浑南区、康平县等四区三县市为研究区,对研究区内耕地土壤质地、灌排能力、化肥使用强度、表土层厚度、有机质含量、耕作方式、耕地产能等情况进行实地调查,获得调查样点数据491份。通过统计分析方法确定影响耕地产能的其他因素的稳定水平,筛选出只有表土层厚度作为自变量样本点容量,运用非线性回归方法构建函数方程分析表土层厚度与耕地产能间的关系结果表明:在表土层厚度在5 cm至24.5 cm之间时,表土层厚度与耕地产能存在对数函数关系.所构建函数方程为y=5144.6 InQ)-2995.2(50 x<24.5);耕地产能随表土层厚度增加逐渐增加,在表土层厚度为24.5 cm时,耕地产能达到最高为13960.59 kg hm;对表土层厚度薄的耕地进行表土层厚度增加,耕地产能提高效果更加明显。Topsoil is very important for crop growth,and the thickness of topsoil affects the productivity of cultivated land.However,their relationship was not well known.It is necessary and urgent that studying the functional relationship between the topsoil thickness and the productivity of the cultivated land in order to promote the protection and utilization of topsoil resources.Four administrative districts(Shenhei district,Sujiatun district,Liaozhong district,Hunnan district),three counties(Kangping country,Faku country and Xinmin)in Shenyang were chosen as the study area.The 7 parameter indices(topsoil thickness,cultivated land productivity,soil texture,farming method,fertilizer intensity,irrigation and drainage conditions and soil organic matter)were measured and surveyed and 491 samples were obtained.Through statistical analysis,the sample capacity at the stable level was screened from other factors besides the surface soil thickness,and the function equation was established by the nonlinear regression model between soil layer thickness and productivity of cultivated land.The results showed that there was a logarithmic relationship between the topsoil thickness and the productivity of cultivated land at 5~24.5 cm soil thickness,and the constructed function equation was y-5144.61n(x)-2995.2(%=5〜24.5).The productivity of cultivated land increased gradually with the topsoil thickness.At 24.5 cm soil thickness,the productivity of cultivated land reached a maximum of 13960.59 kg hm-2.Productivity of cultivated land increased more obviously with the topsoil thickness of cultivated land.

关 键 词：耕地产能 表土层厚度 沈阳市 

分 类 号：S158[农业科学—土壤学] S344[农业科学—农业基础科学]