Long-term straw rather than manure additions improved least limiting water range in a Vertisol
文献类型： 外文期刊
作者： Ruan, Renjie 1 ; Zhang, Zhongbin 1 ; Wang, Yuekai 1 ; Guo, Zichun 1 ; Zhou, Hu 1 ; Tu, Renfeng 3 ; Hua, Keke 4 ; Wang, Daozhong 4 ; Peng, Xinhua 1 ;
作者机构： 1.Chinese Acad Sci, State Key Lab Soil & Sustainable Agr, Inst Soil Sci, Nanjing 210008, Peoples R China
2.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China
3.Anhui Agr Univ, Sch Resources & Environm, Hefei 230036, Peoples R China
4.Anhui Acad Agr Sci, Hefei 230001, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100081, Peoples R China
关键词： Least limiting water range; S index; Organic fertilizations; Water stable aggregates
期刊名称：AGRICULTURAL WATER MANAGEMENT （ 影响因子：6.611； 五年影响因子：6.574 ）
ISSN： 0378-3774
年卷期： 2022 年 261 卷
页码：
收录情况： SCI
摘要： Least limiting water range (LLWR) is a range in soil water content not limiting root growth, which integrates the effect of soil water retention, aeration, and penetration resistance. This study aimed to assess the effect of different long-term fertilization treatments on LLWR in the surface layer of a Vertisol. Soil samples were taken from six long-term fertilization treatments including no fertilization (Control), inorganic fertilization (NPK), inorganic fertilization plus low amount of straw (NPKLS), inorganic fertilization plus high amount of straw (NPKHS), inorganic fertilization plus pig manure (NPKPM) and inorganic fertilization plus cow manure (NPKCM) for measuring LLWR. Results showed that in comparison with the Control, the manure treatments (NPKPM and NPKCM) increased soil organic carbon content (SOC) more pronounced than the straw treatments (NPKLS and NPKHS). However, the water stable aggregates (WSA(0.25)) in the manure treatments was much smaller than the straw treatments. Soil water content at field capacity (theta(FC)) was significantly higher in the manure treatments (NPKPM and NPKCM) than the other treatments. However, soil water content at soil penetration resistance of 3 MPa (theta(PR)) was significantly lower in the straw treatments than in the manure treatments. The LLWR in the manure treatments had sharper decline with bulk density than the other treatments. In comparison with the Control and NPK treatments, the straw treatments significantly increased the LLWR, but manure treatments did not, probably resulting from positive relation between SOC and penetration resistance at a given soil water content and less favorable effect of the manures on soil aggregation than the straw. The S index was significantly increased by the NPKCM treatment relative to the Control, and positively correlated with the SOC. The variation of WSA(0.25) instead of SOC could explain the change of LLWR under different fertilization treatments effectively. These observations imply that the LLWR could assess the effect of organic fertilizations on soil physical quality more comprehensively.
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