摘要
研究柑橘园长期种植白三叶对四川丘陵区紫色土有机碳及氮素在团聚体中分布的影响,为紫色土地力提升和柑橘园肥料合理运筹提供理论依据。2014—2020年在川东北丘陵区开展5年田间定位试验,设置柑橘园清耕及柑橘园间作白三叶2个处理,2020年3月,采集0~10、10~20和20~40 cm土层土壤样品,测定水稳性团聚体及有机碳、全氮含量。结果表明,川东北丘陵区柑橘园土壤水稳定团聚体以<0.25 mm小粒级为主,2~1 mm粒级含量最低。与清耕相比,柑橘园长期种植白三叶增加了2~0.25 mm粒级团聚体含量,减少了>2、<0.25 mm粒级团聚体含量,且不同土层之间均表现出这一趋势。种植白三叶显著提高土壤0~20 cm土层及不同粒级团聚体中有机碳和全氮含量,表现为随着粒级的减小含量逐渐增加、且随土层加深呈下降趋势。除0~10 cm土层>2、2~1 mm粒级外,柑橘园种植白三叶均能提高不同土层中各粒径土壤碳氮比。综上,柑橘园长期种植白三叶增加土壤>0.25 mm水稳性大团聚体含量,补充紫色土有机碳库和氮养分含量,能够改善土壤团粒结构,提升紫色土持续生产能力。
The effects of long-term planting white clover in citrus orchard on the distribution of soil organic carbon and nitrogen in purple soil aggregates in hilly area of Sichuan province were studied to provide theoretical basis for improving soil fertility and rational fertilizer management in citrus orchards.From 2014 to 2020,a 5-year field experiment was carried out in the hilly area of northeast Sichuan province.Two treatments were set up:clear tillage in orange orchard and white clover intercropping in orange orchard.Soil samples of 0-10,10-20 and 20-40 cm soil layers were collected in March 2020 to determine the contents of water stable aggregates,organic carbon and total nitrogen.The results showed that the soil water stable aggregates of citrus orchard in hilly area of northeast Sichuan were mainly small particle size<0.25 mm,and the content of 2-1 mm particle size was the lowest.Compared with clear tillage,planting white clover in citrus orchard increased the aggregate content of 2-0.25 mm,decreased the aggregate content of>2 and<0.25 mm,and this trend was showed in different soil layers.Planting white clover significantly increased the content of organic carbon and total nitrogen in the 0-20 cm soil layers and aggregates of different grain sizes,and the contents were increased gradually with the decrease of particle size and decreased with the deepening of soil layer.Except for the grain size of>2 and 2-1 mm in 0-10 cm soil layer,planting white clover in orange orchard improved the soil ratio of carbon to nitrogen of each particle size in different soil layers.To sum up,long term planting white clover in citrus orchard can increase the content of>0.25 mm water stable aggregates,supplement the organic carbon pool and nitrogen nutrient content of purple soil,which can improve the soil aggregate structure and enhance the sustainable production capacity of purple soil.
作者
周泽弘
蒲远凤
梁琴
全紫曼
马雪清
莫坤
韩文斌
杨贵川
敬昱霖
漆燕
ZHOU Ze-hong;PU Yuan-feng;LIANG Qin;QUAN Zi-man;MA Xue-qing;MO Kun;HAN Wen-bin;YANG Gui-chuan;JING Yu-lin;QI Yan(Nanchong Academy of Agricultural Sciences,Nanchong Sichuan 637000;Nanchong Forestry Technology Promotion Station,Nanchong Sichuan 637000)
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2023年第12期12-18,共7页
Soil and Fertilizer Sciences in China
基金
国家绿肥产业技术体系(CARS-22-Z12)
四川省区域特色经济作物创新团队(sccxtd-2020-12)
四川省水果创新团队(sccxtd-2020-04)
四川省南充市研发资金项目(21YFZJ0043)。
关键词
紫色土
白三叶
柑橘园
团聚体
有机碳
氮素
purple soil
white clover
citrus orchard
aggregate
organic carbon
nitrogen
