安徽江淮地区不同耕作方式下水稻土碳含量变化特征研究

Soil carbon distribution characteristics of paddy soils under different land use patterns in Anhui Province

以安徽省六安市寿县、合肥市肥西县、六安市舒城县水稻土分布区不同土地利用方式(耕地、休耕地、荒地)土壤为研究对象,进行为期三年的土壤碳含量变化监测,探讨了不同土地利用方式下土壤碳含量及动态变化特征。结果表明:耕地、休耕地有机碳随着时间的推移,总体上均发生了累积,荒地两个地区也发生了累积,但不同年份季节有机碳含量变化较大。与初次采样相比,其中两个区总体呈上升趋势。全碳变化较为复杂,耕地、休耕地与初次采样相比总体呈上升态势,而荒地一个试验区全碳有所降低,其他两个区具有升高态势。最后采样时段与初始土壤碳含量变化情况表明,碳含量增加的比例有机碳明显高于全碳,有机碳在休耕地中增加的比例明显高于其他地类,全碳则在荒地中增加比例最大。

This paper deals with the paddy soils of different uses or in different states(cultivated land,fallow land,waste land)in Shouxian and Shucheng Counties of Lu’an City,and Feixi County of Hefei City in Anhui Province,focuses on monitoring the change of carbon content in soils for a period of three years,and discusses the carbon content in soils of different states or uses,including the features of dynamic change in the carbon content.The results showed that the organic carbon in cultivated land and fallow land had accumulated as a whole,and the organic carbon in wasteland had accumulated as well,but the organic carbon content varied greatly in different seasons.Compared with the initial sampling,two of the regions showed an overall upward trend.The total carbon was more complex in change,and it increased in the cultivated land and fallow land compared with the initial sampling,but decreased in one experimental area and increased in the other two of the waste land.The change of soil carbon content in the final sampling period against the initial one showed that the proportion of organic carbon increase was obviously higher than that of total carbon increase,and the proportion of organic carbon increase in fallow land was obviously higher than in other land types,total carbon increased the most in waste land.