集约化种植下潮土养分肥力与团聚体特征相互关系研究

发布时间：2018-03-09 05:04

本文选题：集约化种植　切入点：潮土　出处：《土壤》2017年01期 　论文类型：期刊论文

【摘要】：通过测定封丘潮土7个肥力指标有机质、全氮、碱解氮、全磷、有效磷、全钾和速效钾,并利用主成分分析方法划分为3种肥力等级(一等、二等和三等肥力),研究了集约化种植条件下潮土养分肥力与团聚体特征的相互关系。结果表明:3种肥力等级下,大团聚体的质量比例最高,微团聚体居中,而粉黏粒最低。在0~5、5~10和10~20 cm土层,一等肥力下大团聚体的质量比例分别较三等肥力提高了25.5%、20.0%和18.5%,而微团聚体的质量比例分别降低了54.3%、43.5%和33.6%;一等肥力和二等肥力土壤团聚体的质量比例之间差异不显著。水稳性大团聚体的数量及其稳定性分别与由7个土壤肥力指标组成的养分肥力系统综合主成分得分F值呈线性正相关关系。7个肥力指标中,有机质、全氮和碱解氮与潮土大团聚体的质量比例及其稳定性显著正相关,并且这种相关性随着土壤深度增加而逐渐减弱。
[Abstract]:Seven fertility indexes, organic matter, total nitrogen, alkali-hydrolyzed nitrogen, total phosphorus, available phosphorus, total potassium and available potassium, were determined in Fengqiu tidal soil. The relationship between nutrient fertility and aggregate characteristics of tidal soil under intensive planting was studied. The results showed that the mass ratio of large aggregates was the highest and the microaggregate was the middle under the three fertility grades. But the silt clay was the lowest in the 0 ~ 5 ~ 5 ~ 5 ~ 5 ~ 10 ~ (10) and 10 ~ (20) cm soil layer. The mass ratios of large aggregates increased by 25.520% and 18.5g%, respectively, while the proportion of micro-aggregates decreased by 54.33.5% and 33.6g, respectively, and there was no significant difference between the first grade fertility and the second grade fertility soil aggregates in the first grade fertility and the second grade fertility soil aggregate mass ratio was increased by 25.50% and 18.5% respectively, while the mass ratio of the microaggregates decreased by 54.3% and 33.6%, respectively. The number and stability of water stable macroaggregates were positively correlated with the integrated principal component score F of 7 soil fertility indexes. Organic matter, total nitrogen and alkali-hydrolyzed nitrogen were positively correlated with the mass ratio and stability of macroaggregates in tidal soil, and the correlation decreased with the increase of soil depth.
【作者单位】：土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所)封丘农业生态实验站;中国科学院大学;
【基金】：国家重点研发计划项目(2016YFD0200304) 国家自然科学基金项目(41471239) 中国科学院科技服务网络计划(STS计划)项目(KFJ-SW-STS-142)资助
【分类号】：S158

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