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不同耕作方式下土壤水分状况对土壤呼吸的初期影响
Authors
刘四义
孙冰洁
+4 more
张延
张晓平
梁爱珍
陈升龙
Publication date
1 January 2016
Publisher
Abstract
以2001年在东北典型黑土上进行的保护性耕作长期定位试验下免耕、 垄作及常规耕作土壤进行了室内培养实验,按照田间持水量(water-holding capacity, WHC)的30%、 60%、 90%、 120%、 150%、 180%、 210%、 240%、 270%设定了9个水分梯度,并分别对其二氧化碳(CO_2)排放量进行了22 d的短期观测,以研究不同耕作方式下土壤水分状况对土壤呼吸的初期影响. 结果表明:①干土条件下在加水培养初期,3种耕作方式均产生了明显的激发效应,并且土壤呼吸速率与土壤含水量间存在正相关关系. ②除干旱(30%WHC)及淹水(240%WHC、 270%WHC)条件下,3种耕作方式CO_2排放通量分别为免耕>垄作>常规耕作. ③对不同耕作方式下土壤水分状况及CO_2排放通量进行了方程拟合,在30%~270%WHC条件下,免耕的CO_2排放通量与水分状况拟合为二次回归方程,而垄作与常规耕作则是线性回归方程. 在30%~210%WHC条件下,免耕与垄作下土壤CO_2排放通量与水分状况均可拟合为较好的对数方程,可决系数R~2分别为0.966、 0.956
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Northeast Institute of Geography and Agroecology, Chinese Academy Of Sciences
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Last time updated on 21/04/2018