首页|免耕和休耕改善黄绵土水稳性团聚体组成及稳定性

免耕和休耕改善黄绵土水稳性团聚体组成及稳定性

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  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
土壤团聚体是土壤结构的基本组成单元,对土壤功能的发挥至关重要,探究耕作措施对土壤水稳性团聚体组成及稳定性的影响,有助于为耕作措施的制定和土壤健康提供理论依据.本研究基于 5年的田间定位试验,分析了免耕+秸秆覆盖(NTMS)、休耕(AL)和常规耕作(CK)对黄绵土 0～20 cm土壤水稳性团聚体组成和稳定性的影响,并解析其与土壤性质间的耦合关系.研究结果表明,NTMS和AL显著增加了>5 mm粒径团聚体含量、平均质量直径(MWD)、几何平均直径(GMD)和>0.25 mm粒径水稳性团聚体质量,显著降低了<0.25 mm粒径团聚体含量和分形维数(D);土壤容重(BD)、饱和持水量(SM)和毛管持水量(CMC)与土壤水稳性团聚体组成具有显著的相关关系,土壤有机质(SOM)、可蚀性因子(K)、pH和过氧化氢酶(CA)与土壤水稳性团聚体稳定性具有显著的相关关系,这 7项因子可以解释土壤团聚体组成和稳定性 92.0%的变异,解释率从大到小的顺序依次为 CMC(33.6%)、SM(25.8%)、BD(11.4%)、SOM(8.71%)、pH(5.42%)、CA(5.27%)和K(1.86%).免耕+秸秆覆盖耕作措施和短期休耕(3年)促进黄绵土>5 mm粒径团聚体的形成,增加土壤团聚体稳定性.
No-tillage and fallow improve the composition and stability of soil water-stable aggregates for cultivated loessial soils
Soil aggregates are the basic units of soil structure and play a crucial role in soil functioning.Investigating the effects of tillage practices on the composition and stability of soil water-stable aggregates is beneficial for providing a theoretical basis for the development of tillage practices and soil health.A 5-year field experiment was conducted to investigate the effects of no-tillage+straw mulching(NTMS),fallow(AL),and conventional tillage(CK)on the water-stable aggregate composition and stability at 0～20 cm soil layer in cultivated loessial soils,and the relationship between these practices and soil properties was analyzed.The results showed that the implementation of NTMS and AL significantly increased the aggregate content of>5 mm particles in diameter,the mean mass diameter(MWD),geometric mean diameter(GMD),and the water-stable aggregate mass of>0.25 mm particles in diameter;but reduced the aggregate content of<0.25 mm particles in diameter and the fractal dimension(D).The composition of soil water-stable aggregates was found to be significantly correlated with soil bulk density(BD),saturated water holding capacity(SM),and capillary water holding capacity(CMC);while the stability of soil water-stable aggregates was significantly correlated with soil organic matter(SOM),erodibility factor(K),pH,and catalase(CA).The seven factors accounted for 92%of the variation in soil aggregate composition and stability,and the importance of these factors was in the order of CMC(33.6%),SM(25.8%),BD(11.4%),SOM(8.71%),pH(5.42%),CA(5.27%),and K(1.86%).No-tillage with straw mulch and short-term fallow practices promote the formation of larger soil aggregates(>5 mm in diameter)and improve the stability of soil water-stable aggregates.

cultivated loessial soilssoil aggregateconservation agricultureloess hilly region

董立国、白晓雄、许浩、胡斯乐、韩新生、王月玲、郭永忠、安钰、万海霞、何钰、蔡进军

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宁夏农林科学院林业与草地生态研究所,宁夏回族自治区 银川 750002

西北农林科技大学林学院,陕西 杨凌 712100

宁夏农林科学院农业资源与环境研究所,宁夏回族自治区 银川 750002

黄绵土 土壤团聚体 保护性农业 黄土丘陵区

宁夏回族自治区重点研发计划宁夏回族自治区重点研发计划宁夏回族自治区自然科学基金宁夏农林科学院林业与草地生态研究所自主研发项目国家自然科学基金宁夏回族自治区青年拔尖人才培养工程项目

2023BEG020422020BCF010012020AAC03293HMS202000131660375RQ0025

2024

10.11689/sc.2023050501

土壤与作物
中国科学院东北地理与农业生态研究所

土壤与作物

CSTPCD
影响因子：0.623
ISSN：2095-2961
年,卷(期)：2024.13(3)