Responses of soil pH to no-till and the factors affecting it: A global meta-analysis

文献类型： 外文期刊

第一作者： Zhao, Xin

作者： Zhao, Xin;He, Cong;Liu, Wen-Sheng;Liu, Wen-Xuan;Liu, Qiu-Yue;Zhang, Hai-Lin;Bai, Wei;Li, Li-Jun;Lal, Rattan

作者机构：

关键词： driver and consequence; global meta-analysis; no-till; soil acidification; soil pH

期刊名称：GLOBAL CHANGE BIOLOGY （ 影响因子：10.863； 五年影响因子：11.717 ）

ISSN： 1354-1013

年卷期： 2022 年 28 卷 1 期

页码：

收录情况： SCI

摘要： No-till (NT) is a sustainable option because of its benefits in controlling erosion, saving labor, and mitigating climate change. However, a comprehensive assessment of soil pH response to NT is still lacking. Thus, a global meta-analysis was conducted to determine the effects of NT on soil pH and to identify the influential factors and possible consequences based on the analysis of 114 publications. When comparing tillage practices, the results indicated an overall significant decrease by 1.33 +/- 0.28% in soil pH under NT than that under conventional tillage (p < .05). Soil texture, NT duration, mean annual temperature (MAT), and initial soil pH are the critical factors affecting soil pH under NT. Specifically, with significant variations among subgroups, when compared to conventional tillage, the soil under NT had lower relative changes in soil pH observed on clay loam soil (-2.44%), long-term implementation (-2.11% for more than 15 years), medium MAT (-1.87% in the range of 8-16celcius), neutral soil pH (-2.28% for 6.5 < initial soil pH < 7.5), mean annual precipitation (-1.95% in the range of 600-1200 mm), in topsoil layers (-2.03% for 0-20 cm), with crop rotation (-1.98%), N fertilizer input (the same for NT and conventional tillage) of 100-200 kg N ha(-1) (-1.83%), or crop residue retention (-1.52%). Changes in organic matter decomposition under undisturbed soil and with crop residue retention might lead to a higher concentration of H+ and lower of basic cations (i.e., calcium, magnesium, and potassium), which decrease the soil pH, and consequently, impact nutrient dynamics (i.e., soil phosphorus) in the surface layer under NT. Furthermore, soil acidification may be aggravated by NT within site-specific conditions and improper fertilizer and crop residue management and consequently leading to adverse effects on soil nutrient availability. Thus, there is a need to identify strategies to ameliorate soil acidification under NT to minimize the adverse consequences.

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