夏闲期耕作对黄土高原旱地麦田土壤水稳性团聚体稳定性的影响

doi:10.3864/j.issn.0578-1752.2018.13.008

Abstract

Abstract: 【Objective】The paper studied the effects of different tillage treatments in summer fallow on the stability characteristics of soil water-stable aggregates in the Loess Plateau.【Method】The 4 rotational tillage experiments, including 4aNT (no-tillage in four experimental years), 3aPT-ST (deep plow in three years, followed subsoiling in forth year), 3aST-PT (subsoiling in three years, followed deep plow in forth year), and 4aST/PT (subsoiling in first year, deep plow in second year, again subsoiling followed by alternating the next year), were conducted in dryland wheat fields of Qiujialing Village in summer fallow period from 2013 to 2017. Based on the experiments, mean weight diameter (MWD), geometric mean diameter (GMD), aggregate stability rate (WSAR), destruction rate (PAD), fractal dimension (D), peak convex coefficient (C_E) and bias coefficient (C_S) were used to analyze and compare soil aggregates stability (＞0.25 mm).【Result】Results indicated that the treatment of 4aPT/ST improved soil organic matter content and winter wheat yield in the dry farmland, and adoption of 4aPT/ST significantly increased the soil aggregates with particles greater than 0.25 mm by 40.4%-45.5%, 61.8%-98.0% and 39.4%-106.1% than 4aNT, 3aPT-ST and 3aST-PT, respectively. In addition, GMD, MWD, WSAR and C_S of water-stable aggregates under 4aST/PT treatment was also higher than that under other three treatments, but D, PAD and C_E of water-stable aggregates under 4aST/PT treatment was lower than that under other treatments at 0-50 cm soil depth (P＜0.05). The correlation between parameters showed that there were significant positive correlation among WSAR, MWD, GMD and C_S, while these indexes had negative correlation with PAD, D and C_E (P＜0.01).【Conclusion】Tillage in summer fallow influenced the stability of soil water-stable aggregates, and adoption of 4aST/PT increased soil macro-aggregate content and stability and improved dry farmland soil structure and yield.

Key words: tillage in summer fallow, dry farmland wheat field, water-stable aggregates, the stability indexes, soil structure

LI Hui, DAI XinJun, GAO ZhiQiang. Stability Characteristics of Soil Water-Stable Aggregates Under Different Tillage Treatments in Summer Fallow on the Loess Plateau[J].Scientia Agricultura Sinica, 2018, 51(13): 2524-2534.

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Stability Characteristics of Soil Water-Stable Aggregates Under Different Tillage Treatments in Summer Fallow on the Loess Plateau

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