摘要
以赤峰市敖汉旗水平梯田土壤为研究对象,选取玉米、谷子、高粱、绿豆4种当地多年主栽作物的表层(0~20 cm)土壤216个样品,通过方差分析方法探究梯田4种作物表层土壤有机碳含量的差异及其影响因素。结果表明,研究区梯田表层土壤有机碳含量平均值为6.34 g/kg,处于中等偏下水平。不同作物土壤有机碳含量由高到低表现为绿豆>谷子>高粱>玉米。在0.01显著性水平下,绿豆地土壤有机碳含量显著高于玉米、高粱、谷子地(P=0.000 6)。玉米、高粱、绿豆地土壤有机碳含量均随坡位的上升而减少,谷子则相反。4种作物土壤有机碳含量大小在两个坡向上都表现为阴坡>阳坡。下坡位以及阴坡的土壤有机碳含量比较高。人为因素是通过不同的耕作制度和管护措施来影响梯田土壤有机碳含量的,免耕、秸秆还田、绿豆种植等措施能提高梯田土壤有机碳含量。
This study was conducted to research the soil organic carbon contents in terraced fields. 216 topsoil samples were collected from the fields growing four local crops（ mung bean,millet,sorghum,corn）,and soil organic carbon contents of these four different soil samples and its affecting factors by the way of difference analysis were analyzed. The results showed that the average value of the topsoil organic carbon contents in the terraced fields was 6. 34 g / kg,which was at the lower middle level. Under different crops,soil organic carbon content expressed from high to low as mung bean millet sorghum corn. On the 0. 01 level of significance,soil organic carbon content of mung bean was significantly higher than those of millet,sorghum and corn（ P = 0. 000 6）. Soil organic carbon contents of corn,sorghum and mung bean were reduced with the rising slope position,for millet it was the opposite. Organic carbon contents of all four crops among two slope directions expressed as shade slope sunny slope. Mung bean was beneficial for the fertility restoration of the soil. Lower slope position and shade slope had relatively high organic carbon content. Effects of human activities on soil organic carbon content of terraced fields were embodied in the different cultivation and management measures,no-till methods,straw returning and planting mung bean were helped soil organic carbon content increasing.
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2017年第1期14-20,共7页
Soil and Fertilizer Sciences in China
基金
内蒙古应用研究与开发计划资助项目(20110732)
国家自然科学基金项目(31500584)
高等学校科学研究项目(NJZZ16055)
内蒙古自然科学基金项目(2016MS0407)
关键词
梯田
土壤
有机碳
影响因素
terraced fields
soil
organic carbon
affecting factors
