摘要
为探究西北干旱半干旱区传统耕地向枸杞园地转变对土壤质量的影响,以甘肃省靖远县五合镇为研究区,采集耕地(n=18)与枸杞园地(n=28)0~20 cm土层土壤样品,测定14项理化指标;通过主成分分析构建最小数据集(MDS),计算土壤质量指数(SQI),并采用土壤障碍因子模型诊断土壤质量的主要限制因素。结果表明:与传统耕地相比,枸杞园地容重较耕地增加8.9%,总孔隙度与田间持水量分别减少15.7%和22.5%;速效磷(45.4 mg·kg^(-1))与速效钾(382.84 mg·kg^(-1))大量积累,碱解氮(33.77 mg·kg^(-1))缺乏,电导率升高(229.21μS·cm^(-1)),表明枸杞果园盐渍化风险加剧。基于MDS的SQI结果显示,园地土壤质量(0.489)显著低于耕地(0.531),物理结构退化是核心限制因素,导致土壤质量整体下降。因此,果园长期化肥施用过量及频繁人为活动可导致土壤物理结构退化、盐分表层聚积及土壤质量下降。
To investigate the effects of traditional cropland conversion to wolfberry(Lycium barbarum)orchards on soil quality in the arid and semi-arid regions of Northwest China,this study selected Wuhe Town in Jingyuan County,Gansu Province,as the study area.Soil samples(0~20 cm depth)were collected from cropland(n=18)and wolfberry orchards(n=28),and 14 physicochemical properties were analyzed.A minimum dataset(MDS)was constructed using principal component analysis,and the soil quality index(SQI)was calculated.Additionally,a soil obstacle factor model was applied to diagnose key limiting factors for soil quality improvement.The results showed that compared to cropland,wolfberry orchards exhibited an 8.9%increase in bulk density,along with 15.7%and 22.5%reductions in total porosity and field capacity,respectively.Chemically,available phosphorus(45.4 mg·kg^(-1))and available potassium(382.84 mg·kg^(-1))accumulated substantially,while alkaline hydrolysis nitrogen(33.77 mg·kg^(-1))was deficient.The electrical conductivity(229.21μS·cm^(-1))increased significantly,indicating heightened salinization risk.The SQI based on MDS revealed that orchard soil quality(0.489)was significantly lower than that of cropland(0.531),with physical structure degradation identified as the primary limiting factor.Consequently,prolonged overuse of chemical fertilizers and frequent human activities result in soil physical structure degradation,surface layer salt accumulation,and diminished soil quality.
作者
郭皓
张强
田瑞斌
吴佩
樊欣瑶
孙丽坤
路永莉
GUO Hao;ZHANG Qiang;TIAN Ruibin;WU Pei;FAN Xinyao;SUN Likun;LU Yongli(College of Resources and Environment,Gansu Agricultural University,Lanzhou,Gansu 730070,China;College of Animal Science and Technology,Gansu Agricultural University,Lanzhou,Gansu 730070,China)
出处
《干旱地区农业研究》
北大核心
2025年第6期238-247,共10页
Agricultural Research in the Arid Areas
基金
国家自然科学基金项目(32260809)
甘肃农业大学青年导师扶持基金项目(GAU-QDFC-2024-17)。
关键词
枸杞
土地利用方式
土壤理化性质
土壤质量指数
Lycium barbarum
agricultural land use type
soil physicochemical properties
soil quality index
