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广西喀斯特地区甘蔗地土壤收缩变化研究
郑思文1, 李振东1, 陈晓冰1, 张金莲2, 马蕊1, 陈廷速2, 甘磊1
1.桂林理工大学;2.广西农业科学院
摘要:
广西喀斯特地区干湿季节明显,旱地土壤在干湿交替过程中的土壤胀缩易导致土壤裂隙产生,从而影响土壤水分和养分的保存与运移。本研究以广西南宁里建农业科学院甘蔗地为研究对象,在耕作与免耕条件下,利用Soil Shrinkage Simulator (SSS) 软件对不同土壤含水量条件下甘蔗地土壤进行土壤线性伸展系数变化和土壤收缩曲线拟合的研究。结果表明:土壤收缩特征曲线拟合值和原状土壤样品实测值拟合度较高(R2>0.94);耕作与免耕条件下,土壤线性伸展系数与土壤含水量呈正相关,土壤含水量越高土壤的线性伸展系数越大,收缩越明显;相较于免耕条件下,耕作能够影响土壤含水量的空间分布,调节土壤结构,改善土壤理化性质,增强土壤的收缩能力。因此,研究广西喀斯特地区不同耕作条件下土壤收缩变化可以为广西喀斯特地区合理开展甘蔗种植及土壤保水保肥提供理论依据。
关键词:  耕作方式  土壤收缩  线性伸展  收缩曲线
DOI:10.13758/j.cnki.tr.2019.06.022
分类号:S152.9
基金项目:国家自然科学基金项目(41501230,41701248)和广西自然科学基金项目(2017GXNSFBA198102,2016GXNSFAA380197)资助。
Research on Soil Shrinkage in Sugarcane Field of Karst Region in Guangxi
zhengsiwe1, lizhendong1, chenxiaobing1, zhangjinlian2, marui1, chentingsu2, ganlei1
1.Guilin University of Technology;2.Guangxi Academy of Agricultural Sciences
Abstract:
The dry and wet seasons are obvious in karst areas of Guangxi, which can result in the occurrence of cracks because of swelling and shrinking of dryland soil, thus, may change the storage and migration of water and nutrition in soil. In this paper, the sugarcane soils located in Guanxi Academy of Agricultural Sciences in Nanning was used to study the variation of linear extension coefficient of soils and to simulate the shrinkage curves of soils under the tillage and no-tillage conditions by the software of soil shrinkage simulator software (SSS). The results showed the SSS software could fit the measured data well (R2>0.94). Under the tillage and non-tillage conditions, the linear extension coefficient was significantly positively correlated with soil moisture content, which indicate that the higher soil moisture could result in greater linear extension coefficient and finally more obvious shrinkage of the sugarcane soil. Compared with the no-tillage condition, the tillage treatment could change the distribution of soil moisture, adjust soil structure, improve soil properties and enhance soil shrinkage. The above results could provide the reference to the sugarcane cultivation and preservation of soil water and fertility in the karst region, Guangxi.
Key words:  Tillage method  Soil shrinkage  Linear extension  Shrinkage curve

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