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紫云英添加对土壤团聚体组成及有机碳分布的影响
周方亮, 李 峰, 黄雅楠, 耿明建, 黄 丽
华中农业大学农业部长江中下游耕地保育重点实验室
摘要:
以湖北省武汉市稻田土壤为研究对象,分别设置不添加紫云英(CK)、添加2% 土壤质量的紫云英(G1)、添加4%土壤质量的紫云英(G2)3个处理,进行干湿交替模拟培养试验,研究培养60、120和180 d土壤团聚体组成及团聚体内有机碳的分布特征。结果表明:添加紫云英培养120 d增加了各处理 >2 mm团聚体含量,培养60 d时G1处理的增幅最大(78.08%),培养120 d时G2处理的增幅最大(77.31%),且显著提高了团聚体的平均重量直径。不同培养时期添加紫云英均提高了土壤的有机碳含量,且G2处理土壤有机碳含量高于G1处理,各处理随着培养时间的增加有机碳含量先增加后降低。团聚体中有机碳含量均随着粒级的减小而降低,紫云英添加培养180 d时团聚体各粒级有机碳含量均有所提升,且 >2 mm团聚体的有机碳含量增幅最大(17.17% ~ 43.67%)。紫云英添加培养120 d时主要增加大团聚体内各有机碳组分的相对含量,180 d时显著增加了微团聚体内细颗粒有机碳的含量。
关键词:  紫云英  土壤团聚体  有机碳  有机碳分组  室内培养
DOI:10.13758/j.cnki.tr.2020.04.018
分类号:S152.4
基金项目:国家绿肥产业技术体系项目(CARS-22)和公益性行业(农业)科研专项经费项目(201503122)资助。
Effects of Adding Chinese Milk Vetch on Soil Aggregates Composition and Organic Carbon Distribution
ZHOU Fangliang, LI Feng, HUANG Ya’nan, GENG Mingjian, HUANG Li
Key Laboratory of Arable Land Conservation Middle and Lower Reaches of Yangtze River,Ministry of Agriculture,Huazhong Agricultural University
Abstract:
Taking the paddy field soil of Wuhan City in Hubei Province as the study object, an experiment of dry and wet alternate culture was carried out in which three treatments were designed: without adding Chinese milk vetch(CK), adding 2% Chinese milk vetch(G1), and adding 4% Chinese milk vetch(G2), the composition of soil aggregates and the distribution characteristics of organic carbon in soil aggregates at 60 d, 120 d and 180 d of culture were measured and compared. The results showed that the content of >2 mm aggregates was increased by adding Chinese milk vetch for 120 days, at 60 d the maximum increase was observed for G1 treatment (78.08%) and at 120 d the maximum increase was observed for G2 treatment (77.31%), and adding Chinese milk vetch also significantly increased the mean weight diameter of soil aggregates. Organic carbon contents increased with adding Chinese milk vetch in different culture periods, and organic carbon content of G2 was higher than that of G1. Organic carbon contents in all treatments first increased and then decreased with the increase of culture time. The content of organic carbon in soil aggregates decreased with the decrease of aggregate size. Adding Chinese milk vetch for 180 d increased the contents of organic carbon in all sizes of soil aggregates, and the organic carbon content of >2 mm aggregates increased the most (17.17% ~ 43.67%). Adding Chinese milk vetch for 120 d mainly increased the relative content of organic carbon fractions in macroaggregates, while for 180 d significantly increased the content of fine particulate organic carbon in microaggregates.
Key words:  Chinese milk vetch  Soil aggregates  Organic carbon  Organic carbon fractions  Indoor culture experiment

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