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长期不同轮作模式对黄壤团聚体组成及有机碳的影响
白怡婧1, 刘彦伶2,3, 李 渝2,3, 黄兴成2,3, 张雅蓉2,3, 蒋太明2,4, 秦 松3
1.贵州大学农学院;2.农业部贵州耕地保育与农业环境科学观测实验站;3.贵州省农业科学院土壤肥料研究所;4.贵州省农业科学院茶叶研究所
摘要:
土壤团聚体是土壤结构的基本单元,土壤有机碳是土壤环境质量演变的核心,二者有着密不可分的联系。依托23年的黄壤长期定位田间试验,对比研究玉米单作(MM)、小麦||绿肥-玉米轮作(WMR)和油菜-玉米轮作(RMR)对土壤团聚体组成及有机碳的影响。结果表明:各处理机械稳定性团聚体和水稳性团聚体均以大团聚体(>0.25 mm的团聚体)为优势团聚体,占比分别高达93.04%及74.59%以上;WMR和RMR处理较MM处理显著提高了5-2mm和2-1mm机械稳定性团聚体含量及>5mm和5-2 mm水稳性团聚体含量;WMR处理的水稳性团聚体MWD(平均重量直径)较MM处理显著增加50%;WMR、RMR处理的PAD(团聚体破坏率)和ELT(土壤团聚体不稳定团粒指数)较MM处理分别显著降低了31.32 %、25.97 %和35.90 %、30.65 %;不同粒级水稳性团聚体中均以WMR处理的有机碳含量最高,>5、1-0.5、0.5-0.25 mm粒级团聚体的有机碳含量比MM处理著增加了17.60 %、34.41 %、45.67 %;土壤团聚体有机碳主要集中在>0.25 mm的大团聚体中,而在微团聚体中含量较少,轮作主要提高了>5 mm水稳性团聚体组成中有机碳的贡献率,WMR、RMR处理较MM处理分别提高了23.18和9.16个百分点。小麦||绿肥-玉米轮作能有效改善土壤团聚体组成,提高团聚体稳定性和有机碳含量,可作为贵州黄壤旱地较佳的轮作模式。
关键词:  轮作模式  土壤团聚体  稳定性  土壤有机碳
DOI:
分类号:S152.4
基金项目:( 31860132);贵州省科技平台及人才团队计划(黔科合平台人才[2018]5604号);贵州省农科院科技创新专项(黔农科院科技创新[2017]06号)资助*通信作者(jtm532@163.com)作者介绍:白怡婧(1994—),女,贵州江口人,硕士研究生,研究方向为耕地保育。E-mail:baiyijing7@163.com ,2,3 刘彦伶2,3 李 渝2,3 黄兴成2,3 张雅蓉2,3 蒋太明3,4* 秦 松2
Effects of Different Long-term Rotation Patterns on Aggregate Compositionand Organic Carbon in Yellow Soil
BaiYijing1, Liu Yanling2,3, Li Yu2,3, Huang Xingcheng2,3, Zhang Yarong2,3, Jiang Taiming2,3,4, Qin Song3
1.College of Agriculture, Guizhou University;2.Scientific Observing and Experimental Station of Arable Land Conservation and Agricultural Environment (Guizhou), Ministry of Agriculture;3.Institute of Soil and Fertilizer, Guizhou Academy of Agriculture Science;4.Institute of Tea, Guizhou Academy of Agricultural Science
Abstract:
Soil aggregates are the basic unit of soil structure, soil organic carbon is the core of the evolution of soil environmental quality, and they are inextricably linked. The effects of rotation patterns on the soil aggregates composition and soil organic carbon were compared in this paper, aiming to setup rational rotation mode in yellow soil. The study was based on a successive 23-year field experiments in yellow soil, three treatments were chosen from the experiment, there were maize monoculture system(MM), wheat (intercropping green manure)-maize rotation(WMR) and rape-maize rotation(RMR). The results showed that>0.25 mm aggregate was the dominant component of the mechanically stable and water stable aggregates of soil, the proportion reached 93.04% and 74.59% respectively. Compared with MM treatment , WMR, RMR treatment significantly improved the content of 5-2 mm, 2-1 mm mechanical stability aggregates and the content of 5 mm, 5-2 mm water stable aggregates; WMR treatment significantly increased the MWD ( mean weight diameter) of water stable aggregates by 50% ; WMR, RMR treatment significantly decreased the PAD(percentage of aggregate destruction) and ELT (Soil aggregates unstable mass index) by 31.32%, 25.97 % and 35.90 %, 30.65% respectively. WMR treatment had the highest organic carbon content in different grain levels of water stable aggregates, and the organic carbon content in the size of > 5, 1-0.5, 0.5-0.25 mm increased by 17.60%, 34.41% and 45.67% respectively compared with MM treatment. The contents of soil aggregate organic carbon was mainly in the size of >0.25 mm, being higher than that in microaggregate (<0.25 mm). Rotation measures mainly increased the contribution rate of organic carbon in the size of >5 mm water stable aggregates, WMR and RMR treatments increased 23.18 and 9.16 percentage points respectively compared with MM treatment. In summary, wheat (intercropping green manure)-maize rotation can effectively improve the composition of soil aggregates, improve the stability of the soil aggregates and organic carbon content, can be used as a reasonable rotation model in the yellow soil of Guizhou.
Key words:  Rotation model  Soil aggregate  Stability  Soil organic carbon

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